class 9 science chapter 8 assignment

NCERT Solutions for Class 9 Science Chapter 8 Motion

NCERT Solutions for Class 9 Science (physics) Chapter 8 Motion are given below. In these solutions, we have answered all the intext and exercise questions provided in NCERT class 9 science textbook. Class 9 NCERT Solutions Science Chapter 8 provided in this article are strictly based on the CBSE syllabus and curriculum. Students can easily download these solutions in PDF format for free from our app.

Class 9 Science Chapter 8 Textbook Questions and Answers

INTEXT QUESTIONS

PAGE NO. 100

Question 1: An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

Answer: Yes, zero displacement is possible if an object has moved through a distance. Suppose a body is moving in a circular path and starts moving from point A and it returns back at same point A after completing one revolution, then the distance will be equal to its circumference while displacement will be zero.

Question 2: A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds from his initial position?

Given, side of the square field = 10 m Therefore, perimeter = 10 m × 4 = 40 m Farmer moves along the boundary in 40 second Time = 2 minutes 20 second = 2 × 60 + 20 = 140 s Since, in 40 second farmer moves 40 m

Therefore, in 1 second distance covered by farmer = 40 ÷ 40 = 1m.

Therefore, in 140 second distance covered by farmer = 1 × 140 m = 140 m

Thus, after 2 minute 20 second the displacement of farmer will be equal to 14.1 m north east from initial position.

Question 3: Which of the following is true for displacement? (a) It cannot be zero. (b) Its magnitude is greater than the distance travelled by the object.

Answer: (a) Not true

Displacement can become zero when the initial and final position of the object is the same.

(b) Not true

Displacement is the shortest measurable distance between the initial and final positions of an object. It cannot be greater than the magnitude of the distance travelled by an object. However, sometimes, it may be equal to the distance travelled by the object.

PAGE NO. 102

Question 1: Distinguish between speed and velocity

Answer: Speed has only magnitude while velocity has both magnitude and direction. So, speed is a scalar quantity but velocity is a vector quantity.

Question 2: Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

Answer: The magnitude of average velocity of an object will be equal to its average speed in the condition of uniform velocity in a straight line motion.

Question 3: What does the odometer of an automobile measure?

Answer: In automobiles, odometer is used to measure the distance.

Question 4: What does the path of an object look like when it is in uniform motion?

Answer: In the case of uniform motion, the path of an object will look like a straight line.

Question 5: During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, 3×10 8 ms -1 .

Answer: Here we have, speed = 3 × 10 8 m/s

Time = 5 minute = 5 × 60 s = 300 s

Using, Distance = Speed × Time ⇒ Distance = 3 × 10 8 × 300 m = 900 × 10 8 m = 9.0 × 10 10 m

PAGE NO 103

Question 1: When will you say a body is in (i) uniform acceleration? (ii) non-uniform acceleration?

Answer: (i) A body is said in uniform acceleration when its motion is along a straight line and its velocity changes by equal magnitude in equal interval of time.

(ii) A body is said in non-uniform acceleration when its motion is along a straight line and its velocity changes by unequal magnitude in equal interval of time.

Question 2: A bus decreases its speed from 80 km/h to 60 km/h in 5 s. Find the acceleration of the bus.

Question 3: A train starting from a railway station and moving with uniform acceleration attains a speed of 40 km/h in 10 minutes. Find its acceleration.

PAGE NO. 107

Question 1: What is the nature of the distance – time graphs for uniform and non-uniform motion of an object?

Answer: (a) The slope of the distance-time graph for an object in uniform motion is a straight line. (b) The slope of the distance-time graph for an object in non-uniform motion is not a straight line.

Question 2: What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?

Answer: When the slope of distance-time graph is a straight line parallel to time axis, the object is stationary.

Question 3: What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis?

Answer: When the graph of a speed time graph is a straight line parallel to the time axis, the object is moving with constant speed.

Question 4: What is the quantity which is measured by the area occupied below the velocity- time graph?

Answer: The quantity of distance is measured by the area occupied below the velocity time graph.

PAGE NO 109-110

Question 1: A bus starting from rest moves with a uniform acceleration of 0.1ms –2 for 2 minutes. Find (a) the speed acquired, (b) the distance travelled.

Answer:  Here we have, Initial velocity (u) = 0 m/s Acceleration (a) = 0.1ms –2   Time (t) = 2 minute = 120 seconds 

(a) The speed acquired: We know that, v = u + at ⇒ v = 0 + 0.1 × 120 m/s ⇒ v = 12 m/s Thus, the bus will acquire a speed of 12 m/s after 2 minute with the given acceleration.

(b) The distance travelled:

Thus, bus will travel a distance of 720 m in the given time of 2 minute.  

Question 2: A train is travelling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of – 0.5 m/s 2 . Find how far the train will go before it is brought to rest.

Question 3: A trolley, while going down an inclined plane, has an acceleration of 2 cm/s 2 . What will be its velocity 3 s after the start?

Answer: Here we have, Initial velocity, u = 0 m/s Acceleration (a) = 2 cm/s 2 = 0.02 m/s 2 Time (t) = 3 s Final velocity, v = ?

We know that, v = u + at            Therefore, v = 0 + 0.02 × 3 m/s           ⇒ v = 0.06 m/s Therefore, the final velocity will be 0.06 m/s after start.

Question 4:  A racing car has a uniform acceleration of 4 m/s 2 . What distance will it cover in 10 s after start?

Thus, racing car will cover a distance of 200 m after start in 10 s with given acceleration.

Question 5: A stone is thrown in a vertically upward direction with a velocity of 5 m/s. If the acceleration of the stone during its motion is 10 m/s 2 in the downward direction, what will be the height attained by the stone and how much time will it take to reach there?

Thus, stone will attain a height of 1.25 m and time taken to attain the height is 0.5 s.

Question 1: An athlete completes one round of circular track of diameter 200 m in 40 sec.  What will be the distance covered and the displacement at the end of 2 minutes 20 sec? 

Answer: Time taken = 2 min 20 sec = 140 sec. Radius, r = 100 m. In 40 sec the athlete complete one round.    

So, in 140 sec the athlete will complete = 140 ÷ 40 = 3.5 round.

At the end of his motion, the athlete will be in the diametrically opposite position.

Displacement = diameter = 200 m.

Question 2: Joseph jogs from one end A to another end B of a straight 300 m road in 2 minutes and 30 sec and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging.

(a) from A to B (b) from A to C?

Answer: For motion from A to B: Distance covered = 300 m = Displacement = 300 m.

Time taken = 150 sec.

(a) We know that,   Average speed  = Total distance covered ÷ Total time taken  = 300 m ÷ 150 sec = 2 ms -1  

Average velocity = Net displacement ÷ time taken = 300 m ÷ 150 sec = 2 ms -1

(b) For motion from A to C:

Distance covered = 300 + 100 = 400 m.

Displacement = AB – CB = 300 – 100 = 200 m.

Time taken = 2.5 min + 1 min = 3.5 min = 3.5 × 60 min = 210 sec.

Therefore,        Average speed = Total distance covered ÷ Total time taken  = 400 ÷ 210 = 1.90 ms -1 .

Average velocity = Net displacement ÷ time taken  = 200 m ÷ 210 sec = 0.952ms -1 . 

Question 3: Abdul, while driving to school, computes the average speed for his trip to be 20 kmh -1 . On his return trip along the same route, there is less traffic and the average speed is 30 km/h. What is the average speed of Abdul’s trip? 

Question 4: A motor boat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 ms -2 for 8.0 s. How far does the boat travel during this time?

Answer:  Here,      u = 0 m/s                  a = 3 ms -2                t = 8 s

Using,  s = ut + ½ at 2   ⇒ s = 0 × 8 + ½ × 3×8 2 ⇒ s = 96 m.

Question 5: A driver of a car travelling at 52 kmh -1 applies the brakes and accelerates uniformly in the opposite direction. The car stops after 5 s. Another driver going at 34 kmh -1 in another car applies his brakes slowly and stops in 10 s. On the same graph paper, plot the speed versus time graphs for two cars. Which of the two cars travelled farther after the brakes were applied?  

Answer: In in the following graph, AB and CD are the time graphs for the two cars whose initial speeds are 52 km/h(14.4 m/s) and 34 km/h(8.9 m/s), respectively.

Distance covered by the first car before coming to rest = Area of triangle AOB = ½ × AO × BO = ½ × 52 kmh -1 × 5 s = ½  (52 × 1000 × 1/3600) ms -1 × 5 s = 36.1 m 

Distance covered by the second car before coming to rest = Area of triangle COD = ½ × CO × DO = ½ × 34 km h -1 × 10 s = ½ × (34 × 1000 × 1/3600) ms -1 ×10 s = 47.2 m

Thus, the second car travels farther than the first car after they applied the brakes.

Question 6: Fig 8.11 shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions:

(a) Which of the three is travelling the fastest? (b) Are all three ever at the same point on the road? (c) How far has C travelled when B passes A? (d) How far has B travelled by the time it passes C?

Answer: (a) B is travelling fastest as he is taking less time to cover more distance. (b) All three are never at the same point on the road. (c) Approximately 6 kms.   [as 8 – 2 = 6] (d) Approximately 7 kms. [as 7 – 0 = 7] 

Question 7: A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10ms -2 , with what velocity will it strike the ground? After what time will it strike the ground?

Answer: Given, initial velocity of the ball (u) = 0 (since it began at the rest position) Distance travelled by the ball (s) = 20m Acceleration (a) = 10 ms -2

As per the third motion equation, v 2 = u 2 +2as ⇒ v 2 = 2 × (10ms ‒2 ) × (20m) + 0 ⇒ v 2  = 400m 2 s ‒2 ⇒ v = 20ms -1

The ball hits the ground with a velocity of 20 meters per second.

As per the first motion equation, t = (v-u)/a = (20-0)ms ‒1  / 10ms ‒2 = 2 seconds

Therefore, the ball reaches the ground after 2 seconds.

Question 8: The speed – time graph for a car is shown in Figure:

(a) Find out how far the car travels in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period.

(b) Which part of the graph represents uniform motion of the car?

Answer: Shaded area representing the distance travelled is as follows:

(a) The shaded area represents the displacement of the car over a time period of 4 seconds. It can be calculated as:

Distance = 1/2 × 4 × 6 = 12 m

Therefore, the car travels a total of 12 meters in the first four seconds.

(b) Since the speed of the car does not change from the points (x=6) and (x=10), the car is said to be in uniform motion from the 6 th  to the 10 th  second.

Question 9: State which of the following situations are possible and give an example of each of the following:

(a) an object with a constant acceleration but with zero velocity

(b) an object moving with an acceleration but with uniform speed.

(c) an object moving in a certain direction with an acceleration in the perpendicular direction.

Answer: (a) It is possible; an object thrown up into the air has a constant acceleration due to gravity acting on it. However, when it reaches its maximum height, its velocity is zero.

(b) it is impossible; acceleration implies an increase or decrease in speed, and uniform speed implies that the speed does not change over time

(c) It is possible; for an object accelerating in a circular trajectory, the acceleration is perpendicular to the direction followed by the object.

Question 10: An artificial is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hrs to revolve around the earth.   

Answer: Here, 

Given, radius of the orbit = 42250 km

Therefore, circumference of the orbit = 2 × π × 42250 km = 265571.42 km

Time taken for the orbit = 24 hours

Therefore, speed of the satellite = 265571.42 ÷ 24 = 11065.4 km.h -1

The satellite orbits the Earth at a speed of 11065.4 kilometers per hour.

Class 9 Science NCERT Solutions Chapter 8 Motion

CBSE Class 9 Science NCERT Solutions Chapter 8 helps students to clear their doubts and to score good marks in the board exam. All the questions are solved by experts with a detailed explanation that will help students complete their assignments & homework. Having a good grasp over CBSE NCERT Solutions for Class 9 Science will further help the students in their preparation for board exams and other competitive exams such as NTSE, Olympiad, etc.

NCERT Solutions for Class 9 Science Chapter 8 PDF

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Class 9 Science Assignments

We have provided below free printable Class 9 Science Assignments for Download in PDF. The Assignments have been designed based on the latest NCERT Book for Class 9 Science . These Assignments for Grade 9 Science cover all important topics which can come in your standard 9 tests and examinations. Free printable Assignments for CBSE Class 9 Science , school and class assignments, and practice test papers have been designed by our highly experienced class 9 faculty. You can free download CBSE NCERT printable Assignments for Science Class 9 with solutions and answers. All Assignments and test sheets have been prepared by expert teachers as per the latest Syllabus in Science Class 9. Students can click on the links below and download all Pdf Assignments for Science class 9 for free. All latest Kendriya Vidyalaya Class 9 Science Assignments with Answers and test papers are given below.

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We have provided below the biggest collection of free CBSE NCERT KVS Assignments for Class 9 Science . Students and teachers can download and save all free Science assignments in Pdf for grade 9th. Our expert faculty have covered Class 9 important questions and answers for Science as per the latest syllabus for the current academic year. All test papers and question banks for Class 9 Science and CBSE Assignments for Science Class 9 will be really helpful for standard 9th students to prepare for the class tests and school examinations. Class 9th students can easily free download in Pdf all printable practice worksheets given below.

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NCERT Solutions for Class 9 Science - Free PDF Download

Class 9 Science is definitely more extensive than what students studied in the previous class. It also forms a foundation for everything that is yet to come in the higher chapter, therefore, paying complete attention and understanding each topic thoroughly is essential. While some students find Science difficult, some find it easy. However, to make it easy, understanding the subject is very important and this can be accomplished with the help of NCERT Solutions.

For students in Class 9, NCERT Solutions Class 9 Science is a great book to refer to. The Class 9 Science Solutions are available chapter-wise at Vedantu and can prove to be very useful for the students. Whether you are struggling to grasp the concepts of various topics in the chapters or willing to push yourself to score better in the exams, NCERT Solutions for Class 9 Science PDF is the answer for you. These solutions are provided in an easy-to-understand language and will promote self-learning among students. Class 9 Science consists of Physics, Chemistry, and Biology. It is important for students to understand all the concepts available in these subjects to score well. Through these, students will be able to get solutions for questions that they get stuck in. Students need to know that they should prepare for all chemistry formulas and Biology diagrams to do well.

The CBSE Class 9 Science Solutions , available for all the chapters, encourage a spirit of learning among students. What is even better is that students can learn all the chapters by following the NCERT Science Class 9 Solutions without even having to step out of their homes. NCERT Solutions for Class 9 Science are written by subject experts which in turn will help students to understand the chapters better. Students must focus on all the important concepts and topics available in NCERT Solutions . This will even help students to clear all their doubts in an efficient way and score well in their final examinations.

NCERT Solutions for CBSE Class 9 Science consists of solutions from important concepts and topics such as Natural Resources, Sound, Energy and Work, Gravitation, Laws of Motion, Motion, Living Organism, Tissues, Atoms, Matter, and so on. Apart from getting answers for these topics, students can even access all the extra questions, important questions, exemplar problems, previous year’s question papers, worksheets, sample papers, short answer questions, MCQs, HOTs questions, descriptive type questions, and others. There are even tricks and tips that students can look at to see how to do well and score well in their final examinations.

Vedantu provides the downloadable PDF of NCERT Solutions for Class 9 Science absolutely free of cost. All you need to do is register on the site and download the file. At Vedantu, these solutions are designed by subject matter experts who have immense knowledge and experience. These are designed as per the latest NCERT guidelines and exam pattern to make it a reliable material for exam preparation. Students can also Download NCERT Solutions for Class 9 Maths   to revise the complete syllabus and do well in the exams.

NCERT Class 9 Science Solutions can be found in a particular format to make it easier for students to access the chapters accordingly. These chapters are important for students to prepare for their examinations as well as to help them create a basic foundation for further studies. The solutions will even help students to do their assignments and score well. Given below are all the chapters that students must learn and understand in order for them to do well.

Detailed Overview of Class 9 Science NCERT Solutions

Overview of ncert solutions class 9 science.

For the students of Class 9 Science, it is really important to gain a proper conceptual foundation of the topics and chapters in the syllabus. The chapters included in the Class 9 Science textbook provide detailed insights into different scientific concepts, laws, processes, etc. Students can learn about different states of matter around us, atoms and molecules, the structure of an atom, the fundamental unit of life and much more. They will gain an understanding of different topics including motion, force, laws of motion, gravitation, energy, work, sound, etc. These topics will not only introduce them to new scientific principles but also help them progress in their higher studies. Students can take help from the 9th Science Guide to delve deeper into the topics and improve their knowledge.

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NCERT Solutions for Class 9 Science - Chapter-Wise List

Given below are the chapter-wise NCERT Solutions for Class 9 Science . These solutions are provided by the Science experts at Vedantu in a detailed manner. Go through these chapter-wise solutions to be thoroughly familiar with the concepts.

Know about: How do I score good marks in NCERT science class 9?

NCERT Class 9 Science Solutions - Chapter wise Free PDF Download

NCERT Solutions for Class 9 Science – Free PDF Download

Class 9 NCERT Solutions are important for students preparing for the class 9  Science examinations. Some of the features of NCERT 9 Class Science Book Solutions include:

It consists of all the answers and questions available in the Class 9 NCERT textbook

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Students can opt for NCERT 9th class Science book solutions PDF free download . This ensures that the book is easily accessible to students at any time

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The entire NCERT Science Class 9 Solutions can be availed free of cost at Vedantu. These solutions have been drafted as per the latest guidelines issued by the CBSE . To download the NCERT Solutions for Class 9 Science for a chapter, all you are required to do is click on the link of the particular chapter. The basic concept regarding the chapter is explained online by our experts in a Step-by-Step manner that can be easily understood by you.

The NCERT Class 9 Science solutions chapters will not only help you to understand the basic concepts but will definitely enable you to score more in your examination. All these chapters will help you achieve a more fundamental and in-depth understanding of Science and reinforce your knowledge of the subject.

It is very important to have a good understanding of the basic concepts such as work and energy, Structure of the Atom, Gravitation, Force and Laws of Motion etc. of Science-based subjects like Chemistry, Physics and Biology. NCERT Solutions for Class 9 Science includes solutions of all exercises given in the chapters according to CBSE Syllabus for you. When you are in doubt regarding any of the chapters in your CBSE NCERT Science book Class 9 , the NCERT Solutions Science Class 9 is of great help indeed. It helps you understand the concepts in a manner that virtually forms a picture in your mind and consequently builds up your confidence in the subject.

Explained in a logical manner, the Science NCERT Solutions Class 9 provides apt solutions for the chapters. Solutions of Various chapters are provided in great detail. Once you click on a particular chapter, you will be able to find the link to the solutions of the particular chapter. You can click on the particular chapter and visit the webpage where you will get to learn about the concepts. Available as a download option, the NCERT Solutions for Class 9 Science comes in very handy. Wait no further and register for the NCERT 9th class Science book solutions PDF free download for absolutely free of cost.

NCERT Solutions also has important questions that you can access which will help you score well in your examination. These solutions will help you to understand the CBSE NCERT Class 9 Science syllabus better. You will be able to tackle complex concepts and topics with the help of the NCERT Solutions PDF . The study materials are the ideal book that you can use for you to do well in your examinations. All the problems and solutions are explained in a step by step manner to further help you understand the topics. Concepts such as Tissues, Living Life Forms, Force, Movement, Laws of Movement, Energy, Attraction, Work, Sound. Normal Assets and so on are important for you to learn and understand in order for you to score well in your examination.

There are a total of 15 chapters that are available in the NCERT Solutions for Class 9 Science . Students can access these solutions that are written by subject experts to gain a better understanding of all the concepts and topics. Class 9 Science is an important subject for students to create a base of fundamental concepts. This will help them to score well in their examinations as well as help them do better in their higher classes. The solutions consist of explanations that are written in detail in a simple and easy-going language. This in turn will help students to score well in their annual examinations. Below given are the chapter-wise details of NCERT solutions Class 9 Science for you so that you can get an idea about the chapter and its free pdf of NCERT Solutions.

NCERT Solutions Chapter 1 Class 9 Science Matter in Our Surroundings

NCERT Class 9 Science Chapter 1 acts as a foundation for the learning of Chemistry in students and thus, requires you to have a thorough understanding. Solutions of intext exercises and end exercises of Matter in Our Surroundings, are explained elaborately in the notes by Vedantu that will help you to understand the basic concepts of Chemistry. This chapter allows you to relate to changes in your everyday life by explaining the changes that occur in the state of matter under the effect of pressure and temperature. All-cause and effect resulting in the change of state of the matter are explained in a very simplified manner for you to understand. Try to go through the text and then attempt to answer the questions.

Among the exercises included in NCERT Solutions for Class 9 Science Chapter, 1 are in text Ex 1, 2, 3, 4 and an exercise at the end. The end exercise of Chapter 1 has 9 questions in total. Most of the questions are application based and a few are memory-based questions to test your application skills and cognizance.

The first chapter in the science textbook of class 9 is Matter in Our Surroundings. Here is the list of important topics that are covered in the chapter:

What is the matter?

Classification

Physical properties of matter

Interchange in states of matter

Latent heat

The process like sublimation and evaporation

Effect of Change of Pressure

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 1 of CBSE Class 9 Science Solutions–

Chapter 1: Matter in Our Surroundings Important Questions

Chapter 1: Matter in Our Surroundings Revision Notes

Chapter 1: Matter in Our Surroundings NCERT Exemplar Solutions

NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure

Chapter 2 of NCERT class 9 Science book solutions is about “Is Matter Around Us Pure?” This chapter has been carried forward from the first chapter and it talks about various methods of separation and physical and chemical changes. The chapter explains the types of mixtures and solutions. There are various experiments conducted to explain various types of components of a solution and mixtures. So after understanding this chapter, you will be able to distinguish matter into mixtures and pure substances. For this chapter also question papers are solved on Vedantu which will help you to prepare better for your exams. Diagrams and flowcharts are given to help you clear your concept regarding this chapter.

Chapter 2 of NCERT Solutions for Class 9 Science includes Ex 1, 2, 3, 4 (intext) and an Exercise at the end which comprises a total of 11 questions. A greater number of questions are practical and application-based which allows you to improve the understanding of the chapter.

Chapter 2 “Is Matter Around Us Pure” covers the following topics:

What are compounds?

Characteristics of compounds

Properties of mixtures

Types of mixtures

Separation of mixture

Suspensions and their types

Colloids and their types

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 2 of CBSE Class 9 Science Solutions–

Chapter 2: Is Matter Around Us Pure Important Questions

Chapter 2: Is Matter Around Us Pure Revision Notes

Chapter 2: Is Matter Around Us PureNCERT Exemplar Solutions

Class 9 Science NCERT Solutions Chapter 3 Atoms and Molecules

The 3rd chapter of NCERT Solutions Class 9 carries a significant weightage in the examination with a minimum 3-4 questions being asked from this chapter, every year,  in most of the school examinations. Chapter 3 discusses Atoms and Molecules and also provides insight into the Mole Concept which is a very essential chapter in Class 11 as well. This is where you can build the foundation of the mole concept. To solve the several numerical based questions on the Mole concept, it is imperative that you have a thorough understanding. You will also get to know laws of chemical combination, symbols of elements etc. The solutions to all the questions have been provided by subject experts at Vedantu along with proper diagrams and illustrations. By going through the text and then referring to these NCERT class 9 Science book solutions, you will be able to form a clear picture of how questions are likely to be asked in the examination.

With 5 intext exercises and one at the end with 11 questions, the exercises of NCERT Class 9 Solutions Science for Chapter 3 are designed to test your application skills as well as cognizance.

Chapter 3 is atoms and molecules. The following topics are covered in the chapter:

Atoms and molecules

Laws of chemical combination

What is an atom?

What is a molecule?

Writing chemical formulae

Molecular mass and mole concept

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 3 of CBSE Class 9 Science Solutions–

Chapter 3: Science Atoms and Molecules Important Questions

Chapter 3: Science Atoms and Molecules Revision Notes

Chapter 3: Science Atoms and Molecules NCERT Exemplar Solutions

NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atoms

Chapter 4 also falls under Chemistry and it is on the “Structure of Atom” . If understood properly, this chapter can prove to be very interesting. For those willing to pursue Science in higher Classes, this chapter can prove to be very beneficial. Vedantu’s experts have provided smart solutions to Chapter 4 of NCERT Solutions Class 9.  This chapter involves some basic mathematical calculations and different theories about the structure of atoms which is why it is very scoring. If you can grasp this chapter well, you will be able to score better in the Science paper. To retain all the theories related to atomic structure, keep practising questions from this chapter frequently. This chapter is an important chapter for you from exam perspective also as it includes many important concepts such as Neutrons, Protons, Isotopes, Valency etc.

NCERT Solutions for Class 9 Science Chapter 4 includes Intext Exercise 1, 2, 3, 4, 5, 6, 7 and an End Exercise. It contains a total of 19 questions in its end exercise. This chapter includes application and memory-based questions to test your understanding of the chapter.

The structure of Atoms and molecules covers the following concepts:

Structure of Atom

Charged particles in matter

The models of the structure of an atom

How are electrons distributed in different Orbits (Shells)?

Atomic number and mass number

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 4 of CBSE Class 9 Science Solutions–

Chapter 4: Structure of the Atom Important Questions

Chapter 4: Structure of the Atom Revision Notes

Chapter 4: Structure of the Atom NCERT Exemplar Solutions

NCERT Solutions for Class 9 Science Chapter 5 The Fundamental Unit of Life

The 5th chapter - The Fundamental Unit of Life is related to Biology and it is the first chapter dealing with Biology in your syllabus. This chapter teaches you about cells. The cell structure is also explained in this chapter. Both animal and plant cells are explained with elaborate diagrams. For this chapter as well, you will get all NCERT Solutions for Class 9 Science on Vedantu.

Chapter 5 of Class 9 Science NCERT Solutions has 3 intexts and one end exercise. The exercise at the end has 11 questions. The questions are based on analysis and memory to test your analytical skills and cognizance.

Cell the basic unit of life covers the concepts of 

Cell as a basic unit of life

Prokaryotic and eukaryotic cells

Cell membrane and cell wall

Cell organelles 

Cell inclusions

Chloroplast,

Chromosomes' structure and function

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 5 of CBSE Class 9 Science Solutions–

Chapter 5: The Fundamental Unit of Life Important Questions

Chapter 5: The Fundamental Unit of Life Revision Notes

Chapter 5: The Fundamental Unit of Life NCERT Exemplar Solutions

NCERT Solutions for Class 9 Science Chapter 6 Tissues

The 6th chapter in NCERT Solutions Class 9 Science is on Tissues and explanations on the varied tissue types have been provided. Questions from this chapter are often asked in the Olympiad as well. A thorough understanding of this chapter will allow you to form a strong foundational base in Biology along with increasing your scores in final and Olympiad examinations. Differences between animal and plant tissue have been explained with the help of illustrated diagrams for an enhanced understanding.

NCERT Solution Class 9 Science of Chapter 6 includes all intext exercises and end exercises for you.

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 6 of CBSE Class 9 Science Solutions–

Chapter 6: Tissues Important Questions

Chapter 6: Tissues Revision Notes

Chapter 6: Tissues NCERT Exemplar Solutions

NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms

Diversity in Living Organisms is the 7th Chapter in NCERT Science Class 9 Solutions . As you look around, you will discover a great deal of diversity among the various living organisms. The hierarchy in the plant and animal kingdoms and the system of classification have been explained in this chapter. How they are different from each other and their ways of life are explained through this chapter.

NCERT Solution Class 9 Science of Chapter 7 includes all Intext exercises 1, 2, 3, 4, 5, 6 and end exercises for you. The end exercise includes solutions to all 6 questions. These questions are memory-based questions to test your cognizance.

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 7 of CBSE Class 9 Science Solutions–

Chapter 7: Diversity in Living Organisms Important Questions

Chapter 7: Diversity in Living Organisms Revision Notes

Chapter 7: Diversity in Living Organisms NCERT Exemplar Solutions

NCERT Solutions for Class 9 Science Chapter 8 Motion

With chapter 8 you will be introduced to Physics. In this chapter, you will learn uniform motion and non-uniform motion. You will also understand the concept of speed and direction of motion. After understanding this chapter, you will be able to understand that all objects on the earth are in motion as the earth is constantly in motion. NCERT Solution Class 9 Science of Chapter 8 includes all Intext exercises 1, 2, 3, 4, 5 and end exercises for you. The end exercise includes a solution of all 10 questions given in your NCERT Textbook. These questions are based on your application skills, numerical skills and memory skills.

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 8 of CBSE Class 9 Science Solutions–

Chapter 8: Motion Important Questions

Chapter 8: Motion Revision Notes

Chapter 8: Motion NCERT Exemplar Solutions

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion

You have studied the concept of Force in Class 9, now in class 9 you will study it in depth. You will learn about balanced and unbalanced forces. You will understand all three laws of motion and will get to know physicist Galileo Galilei. This chapter will enhance your conceptual understanding of Force and Motion. NCERT Solution Class 9 Science of Chapter 9 includes all Intext exercises 1, 2, 3 and end exercises and additional exercises for you. The end exercise includes a solution of all 18 questions given in your NCERT Textbook . These questions are based on your application skills, numerical skills and memory-skills.

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 9 of CBSE Class 9 Science Solutions–

Chapter 9: Force and Laws of Motion Important Questions

Chapter 8: Force and Laws of Motion Revision Notes

Chapter 9: Force and Laws of Motion NCERT Exemplar Solutions

NCERT Solutions for Class 9 Science Chapter 10 Gravitation

You must have studied in Class 9 about Newton’s dilemma: why do apples always fall down from the tree? In this chapter of class 9 you will understand more about gravitational force. It is a very important chapter related to Physics. This chapter will give you a vivid idea about how gravitational force works. There are quite a few numericals in this chapter. So, you will require regular practice to score full marks in them. NCERT Solution Class 9 Science of Chapter 10 includes all Intext exercises 1, 2, 3, 4, 5 and end exercise for you. The end exercise includes the solution of all 22 questions given in your NCERT Textbook. These all questions are based on your numerical abilities, application skills, and memory-skills.

Along with this, students can also download additional study materials provided by Vedantu, for Chapter 10 of CBSE Class 9 Science Solutions–

Chapter 10: Gravitation Important Questions

Chapter 10: Gravitation Revision Notes

Chapter 10: Gravitation NCERT Exemplar Solutions

NCERT Solutions for Class 9 Science Chapter 11 Work and Energy

In this chapter you will understand the scientific conception of work and different types of energy. The chapter includes many numericals also so it will require your mathematical skills as well. You need to practice the questions daily. These numericals are really very easy if you understand them and practice them on a daily basis. NCERT Solution Class 9 Science Chapter 11 includes all the 4 Intet and the end exercise, with the answers to all the 21 questions in it. All the questions in the end exercise have been designed to solve your numerical problems solving capabilities and your ability to apply concepts.

NCERT Solutions for Class 9 Science Chapter 12 Sound

You must have heard many types of sound and an echo as well. But what about the production of sound and its journey from its source to our ears. This chapter encompasses this journey and explores more concepts such as echo, reverberation, propagation of a sound wave, etc. NCERT Solution Class 9 Science of Chapter 12 includes all Intext exercises and end exercises for you. The end exercise includes the solution of all 22 questions given in your NCERT Textbook. These questions will test your understanding ability and numerical abilities.

NCERT Solutions for Class 9 Science Chapter 13 Why Do We Fall Ill?

In this chapter you will understand the significance of health, acute and chronic diseases, causes of diseases etc. After reading this chapter, you will understand the value of hygiene for our good health. NCERT Solution Class 9 Science of Chapter 13 includes all Intext exercises and end exercise for you. The end exercise includes the solution of all 6 questions given in your NCERT Textbook. These questions will test your understanding ability and memory skills.

NCERT Solutions for Class 9 Science Chapter 14 Natural Resources

In recent years,  Chennai, Rajasthan, Bangalore and Qatar have experienced severe scarcity of water. Although one might think of several solutions to this problem, a solution that is both correct and practical can only be achieved by a proper understanding of the natural resources. This chapter will provide you with an in-depth understanding of the various natural resources where you get to learn about the role of the atmosphere in climate control, carbon cycle, nitrogen cycle etc. All the intext exercises along with an end exercise have been included in the NCERT Solution Class 9 Science of Chapter 14 . Solutions to all the 6 questions of the end exercise in the NCERT Textbook have been provided. The questions adjudge your comprehensive ability, analytical and memory skills.

NCERT Solutions Class 9 Science Chapter 15 Improvement in Food Resources

This chapter provided you with the knowledge of the nutrients supplied by air, water and soil. Insights into crop production and production management, storage of grains, the nutritional value of food, fertilizers, manure, animal husbandry, fish production and practices such as beekeeping are also provided. NCERT Solution Class 9 Science Chapter 15 comprises all the exercises in between the text along with the end exercise which has solutions to all 9 questions from NCERT Textbook that assess your memory and comprehensive ability. To prepare for the exams, make sure to read the chapter thoroughly and practise all the exercise questions. This is sure to help you score better.

Students can download the entire book of NCERT Solutions for Class 9 science in a PDF format. Students can access practice tests and mock tests to further understand the topics and concerts better. Vedantu even provides NCERT Solutions for all classes and subjects including science for classes from 6 to 12. Students can even download assignments, worksheets, notes, and other study materials that they may require to prepare for their examinations. This will ensure that they get a better understanding of all the topics and concepts in this chapter. Students will even access previous year’s question papers and sample papers to look at all the important questions that they might get in their examination. Before accessing NCERT Solutions books , students must know that most of the questions that are asked in the final examination paper for any class are taken in reference from NCERT Solutions.

CBSE 2024-25 Class 9 Science Marking Scheme

Detailed marking scheme of the examination is given below for you so that you can understand on which unit you should focus more to score maximum.

Why Must You Download the NCERT Solutions for Class 9?

The Prime reasons to download the class 9 Science NCERT solutions are-

Available for Free

Vedantu offers NCERT solutions for class 9 Science completely free. Every chapter of the subject authored by a professional is available completely free. If you are wondering whether you will be asked for money during the sign-up or while downloading, then you don't need to worry about It.

Accessible at any Time

Students can access NCERT Solutions offered by Vedantu at any given point of time. Students can open the PDF on any electronic device wherever they are. This PDF will even help students to revise properly.

Carries all Chapters

The NCERT solutions for class 9 Science subjects carry all chapters and each is assessed by subject experts. From Matter Around Us Pure to Structure of the Atom and The Fundamental of the Unit of Life, the solutions carry all chapters essential to cover and study.

Learn to Manage Time

Students usually face issues with time management when it comes to learning and completing the solution. By downloading the solution, you can develop strategies to learn and solve questions. Furthermore, it will also help in overcoming the anxiety of attending the exam.

Proper Explanation

Another major benefit of downloading the solution is each chapter is presented in an explained manner. The in-house subject authors have ensured that various chapters cover complete details to avoid any confusion later. Students who are in class 9 will be able to understand the subject clearly and will find it easy to handle the query.

CBSE Class 9 Science Examination - Preparation Tips

The NCERT Solutions for Science Class 9 contains all the important questions that are available in the NCERT textbook. Most of the questions available in this book can be expected to come in the annual examination. Hence, students should solve all the questions available in the NCERT Solutions book thoroughly in order for them to prepare for their examinations. The solutions provided by Vedantu will help students to ace their examinations with confidence as all the answers are provided in a step by step manner. Once students are able to understand how to answer certain questions and problems, they will be able to answer all the complex and twisted questions in the question paper without any difficulty.

You should go through the NCERT Solutions of Science Class 9 as it will help you to write answers in a concise and precise manner. Going through these chapter-wise solutions will improve your understanding of the concepts and will also boost your confidence, keeping you ready ahead of the crucial CBSE Class 9 Science examination. There are several techniques explained here that you can use for preparing well in Science.

You can always carry a little diary or notebook where you can jot down the crucial formulas/ principles or definitions to be used for particular sections. Note down a few terms and diagrams illustrating the experiments, explaining the important principles. You may also use it for last-minute revision. You need to have a thorough understanding of all the concepts rather than going through each and every word of the text and trying to remember the same. Resolve your doubts, if any, by attending the live classes at Vedantu without any hassles.

You must prepare a study plan as well if you want to do well in your exams. This way you will be able to space out your time and you will understand what topics and concepts you must focus on more. While creating your study plan you must make sure that you give time to yourself to breathe and take some rest. If you sit to study for hours you may get tired easily and your brain won’t be able to retain a lot of information altogether. You should also make sure that you take care of yourself during your examination. You must eat healthy and get sufficient sleep during your exams.

One of the best ways to prepare for your exams would be to practice. You must practice as much as you can. You can solve previous year’s papers, sample papers, and other question banks. This will help you get an idea of the exam pattern and the type of questions that can be asked. You must solve previous year’s question papers which are at least 10 years old. Apart from understanding the question and question paper pattern, you will even be able to manage your time properly. Time management is very important when it comes to writing an exam. You must know which section to pay more attention to and which section you will be able to finish quickly. Practicing with sample papers and other question banks will help you to manage your time accordingly.

Do not make a habit of procrastinating and allow your mind sufficient time to get a grasp of new concepts.  Start your preparation early and spare the last few days for exams. Prior to the exams, make sure you have covered all the topics beforehand. Learning new things just before the exams will not be favourable. Also, if you get study leaves before your exams then utilize those days carefully. Make a timetable and chalk out your subjects. Science subjects need more time to practice so allot at least 2-3 hours in a day for Science. Practice the numericals in the first hour and then spend another hour on revision and reading. You should also solve a few questions every day. Try to sit to study as early in the morning as possible when your mind is fresh. This is the time when your mind is the most active. If you have someone at home to help you out with studies, ask him/her to sit with you and check your answers when you solve them. Go through the corrections yourself to know where you went wrong. If you do not have anyone to help you out, try to do it yourself.

You should also understand that referring to NCERT Solutions for Class 9 Science is considered to be sufficient to prepare for your examinations. These solutions are framed by Vedantu keeping in mind the abilities of students. These solutions are provided in detail to help you easily understand all the complex topics and concepts. You can even learn technique and tricks to understand the topics better. In order for you to get an overall idea of the concepts, you must start to prepare for your exam beforehand.

Some Other Vital Suggestions for Studying

Another suggestion to study better is to have group studies. However, for this purpose, you and your group have to be really serious and dedicated. When you study in groups, you help each other to understand topics better. When you try to explain something to your friend, your own concepts are clarified better. This way both you and your friend benefit from a group study session. This is something you should always keep in mind since you have to ensure full utilization of these sessions. This is a good habit to have, particularly before the examinations.

Make a habit of solving question papers from the previous year. This will help you to get a hold of the different topics and question patterns usually followed in the exam. In case you do not have the previous years’ question papers, then get hold of some mock test question papers or sample test papers. Solving them is beneficial as you will be fully prepared with the format. Having a set of formulas ready for revision helps you with solving the sums. When you are revising through chapters that require you to do sums, have a separate notebook for writing down the formula. This book is of great help for last moment revision. You will not have to go through page after page looking for the formulas. All you need to do is open the notebook and check the formulas you need. This will help you stay abreast of the important formulas without having to really fret about finding them all over again in case you forget. A common scenario isn’t it? Well, a little strategy will help you overcome these hurdles with ease.

If you are a student who has problems with maths, you will need to practice a bit more than the others. Your theory should be well-prepared so that you can score better in that part. If you have the fear of mathematics, then make it a point to overcome that fear. Do not worry! Maths is not that difficult! All you have to do is forget the difficulty and practice daily. That is the only mantra behind acing maths. Just wake up in the morning and practice 2-3 sums from each chapter. Read the questions carefully before attempting the problem. Understand what it wants and what is already given. Go ahead with it when you understand the question properly.

One more important tip before exams that one must follow is being less distracted. You may think your guardian is being absolutely ruthless when he/she asks you not to watch TV before exams. But what he/she means is that you should wisely utilize your time and distract your mind. It is very important to get into that mindset of studying before exams. Try not getting disturbed or distracted as your mind needs to be in the right state to help you prepare. Allot a specific time for activities such as watching TV or playing video games. Make a time table for that too. You can study the whole day and have a recess period of 2 hours after studying, preferably at night before you go to bed.

Before you write your exam you must make sure that you do a complete revision at least 3 times. Make sure that you don’t learn any new topics one night before the exam. This will only lead to confusion and you might even forget the other topics and concepts that you learned. You should revise one day before the exam, during the night, and then you can do a quick revision in the morning. With the notes that you have, revising concepts and topics will make it easier for you to do. For Class 9 Science , it is important for you to revise how to draw all the diagrams that are required for the examination. This will help you score better marks.

What Else Should You Know While Preparing?

Eating and sleeping sufficiently before exams are very necessary for your body. Eat your food on time and sleep on time. Do not compromise on sleep or go to bed late just the night before your exam. This can cause severe headaches in the morning, potentially making you fall sick while writing your exam. Take proper food with a balanced diet plan so that both your body and mind are healthy.

Lastly, do not take too much pressure. If you are having a problem with any chapter, just get help from Vedantu. Do not stress too much and take short breaks in between study hours. Sitting for long periods can give you back pain and stress you out. Start with the difficult chapters first and then move on to the chapters you find easy. Keep your notes and books arranged so that you do not have to get up repeatedly. Keep cell phones and video games away from the study table. Anything that distracts you should remain out of your sight.

On the day of the examination, try not to discuss what you learned with your friends. This can lead to further confusion for both you and your friends. The way you may have learned a particular concept could be different as compared to the way your friends may have learned a particular topic. Apart from this you may also get confused as to if you missed any topics while studying or not. But don’t worry, you have given your best in your preparation and you will do well according to how you have studied.

These are tried and tested methods and have yielded results for lakhs of students like you all over the country. So, wishing you all the best for your preparation for the CBSE Class 9 Science examination . We advise you to be positive, confident as well as get the concepts clear for good exam performance and a high score. Also, revise the solutions to past question papers after understanding the content of the relevant chapters.

NCERT Solution for Class 9 Science - PDF Availability

Students can get the NCERT Solutions for Class 9 Science for free which they can download at Vedantu. When it comes to NCERT Solutions for Class 9 Science , Vedantu is the best option available to you. You can get easy online access to step-by-step Science NCERT Solutions Class 9 as PDF Free download format, here. The NCERT Solution can be downloaded absolutely free of cost. Vedantu offers a free PDF for NCERT Solutions for Science Class 9 . Apart from being totally free, the PDF can be accessed anytime as per your convenience and from anywhere and what’s more important is that the solutions are provided and reviewed by experienced teachers with long-standing experience.

All the textbook questions and exercises available in the chapters have been answered by subject experts who have vast experience in this subject. Solving these questions will help students to get a detailed and better understanding of all the concepts and topics effectively. The solutions are provided in a step-by-step manner with diagrams to help students to improve their logical thinking and analytical thinking.

The latest edition of NCERT Solutions for Class 9 Science is available at Vedantu based on the CBSE syllabus which will enhance your ability for exam preparation and the convenient download option makes things more hassle-free. You can now study as per the latest syllabus and get all the necessary study material at your fingertips.

Why Vedantu is Always the Best

Vedantu is a pioneer in online tutoring in India, facilitating LIVE learning for students with more than 500 highly qualified teachers who have already taught more than 40,000 students for a cumulative total of 1 million hours and counting!

Vedantu brings quality education to students throughout the country and abroad, covering more than 1,000 cities in 30+ countries. The unique platform for online tutoring fosters interactive learning and knowledge sharing in a personalized manner between students and the teachers, courtesy individual and group lessons which are imparted seamlessly. Teachers can make use of video, two-way audio and whiteboard solutions for delivering lessons, thereby explaining the terms, concept, and the principles in a manner which will leave a forever mark in the young minds. This will ensure you score high in the examinations. The best news here is that you can get free PDFs of any chapter for any class. This makes the process less time-consuming and hassle-free. You can choose to learn from a place of your convenience.

With Vedantu, students and teachers can interact in real-time. A host of learning solutions, resources and study materials across Standard I to XII for many school boards, as well as competitive examinations, are offered here. This is what makes Vedantu the best among all the online learning platforms. Vedantu offers study (NCERT) solutions which facilitate easier learning for you while helping you prepare better for examinations.

Vedantu provides students with online notes, important questions, NCERT Solutions , previous year’s questions and other question banks, as well as popular textbook solutions. Students can access these through the Vedantu online portal for free. They can even download these notes and questions for free based on their convenience. These will ensure that students score well in their annual exams as well as do well in their assignments. Vedantu even provides online tutoring which will help students to clear all their doubts and ace their exams.

National Council of Education and Research or  NCERT , is an independent body established in 1961 by the Government of India to formalize school education and design curriculum for schools across India (including all the CBSE schools). The goal of NCERT is to promote quality learning that is based on comprehensive research in different fields of study. It is recognized globally for its fostering of practical knowledge with a holistic approach.

The 9th Standard is an important year in the lives of the students. All the topics of Maths, Science, English, Hindi and Social Science plays a crucial role in building a foundational base for the subject that is required in higher studies. Science is an integral part of the curriculum and teaches about the human body and its interactions with the surrounding environment, properties of different materials, animal and plant kingdom, etc. The subject incorporates the theories related to human existence and environment and hence, it is one of the most relevant subjects. Students must learn how to write answers in the Class 9 Science examination correctly without making any mistakes.

NCERT Solutions for Class 9 Science helps students to find answers to the textbook problems and clear all their doubts regarding the questions given in the NCERT book. The solutions are given by expert teachers who are well versed in CBSE curriculum and learn how to write answers in the exam that would fetch more marks. Students can take advantage of the well-curated NCERT Solution for all the subjects available on many online educational sites. Referring to the NCERT Solution for Class 9 Science will help students to improve their subject knowledge and marks. Students will feel a boost of confidence to attempt their exam properly. For those willing to form a career in Science, it is important that s/he understands all the concepts in Class 9 Science thoroughly.

CBSE Class 9 Science Chapter-wise NCERT Solutions

CBSE Class 9 Science NCERT Solutions is available in both Hindi and English languages. Students can access both the solutions PDF chapter-wise. Our in-depth understanding of human anatomy and lives around us is based on the understanding of Class 9 Science. The CBSE curriculum of Class 9 Science includes chapters related to all the three major sub-branches of Science i.e. Physics, Chemistry and Biology. Class 9 Science CBSE syllabus includes many topics related to daily life. Students can seek help from chapter-wise NCERT Solutions and prepare for their examination with full vigour. It is important that you download NCERT Solutions for Class 9 Science from genuine sources that include chapter-wise solutions and are available for free download.

The chapter-wise NCERT Solutions for Class 9 Science is extremely helpful in solving textbook problems. Students should first make a habit of understanding the chapters and then refer to the NCERT Solutions if they are having trouble in solving the questions given in the textbook. All these chapters have been designed in a manner that they allow students to build the right foundation for higher classes. Many students find Science an engaging and interesting subject and if you prepare well for the subject, scoring in the Science paper is not that difficult.

NCERT Solutions Class 9 Science offers textbook exercise solutions crafted by subject matter experts who are well versed in NCERT guidelines and CBSE syllabus. Class 9 Science NCERT textbook includes chapters on the matter, laws of nature, resources, human diseases, etc. In chapter 1, 2, 3 and 4, you will get to know in detail about the matter and the atoms and molecules that form the inner constituents of a matter. Chapter 5, 6 ad 7 deals in depth with the human body and what it is formed of including Cells, tissues and other fundamental units of life. Chapter 8, 9, 10 and 11 are physical aspects of nature dealt thoroughly in higher classes during the study of Physics. All these chapters are crucial to understanding the important concepts related to humans and the environment around us.

There are a plethora of advantages of Using NCERT Solution for Class 9 Science . NCERT Solution is the best way to fast track exam preparation and learn for the exam efficiently. These Solutions are designed by the experts and hence, it will boost confidence to deal with any type of questions asked in the final exam. NCERT Solution for Class 9 Science also helps to clear all your subject related doubts and score well in Class 9 CBSE exam .

There are a total of 15 chapters out of which Chapter 7, Chapter 9, Chapter 10, and Chapter 11 are considered to be difficult chapters. Hence, you must focus on these chapters more and try to understand the concepts instead of just memorizing them. There is no shortcut to learn this subject, you need to work hard and believe in yourself.

Why Vedantu

Vedantu is a one-stop destination for accessing all the study materials and expert guidance. The NCERT CBSE Solution for Class 9 Science is a well-created study material for Class 9 students. Vedantu is known to offer 100% authentic and accurate study materials that help students to prepare for the exam. These solutions are provided to students by the subject matter experts who have years of teaching experience. Students will not be required to spend any money if they wish to avail these resources. Be it the sample papers, previous year question papers or textbook solutions, students will be able to download the PDFs for free.

Vedantu caters to the most accurate NCERT Class 9 CBSE Solutions in a free to download PDF format that comprises chapter-wise solutions to the textbook problems. These solutions are available online so that students can access them anytime, anywhere sitting at the comfort of their homes. You can download NCERT Solutions for all the subjects including Maths, English, Social Science, etc.

Since its inception, Vedantu has successfully mentored young students in their academic development. Vedantu has a team of experienced mentors who are passionate about making learning fun and easy for every student. Vedantu believes that learning has to be interesting as well as engaging. Vedantu offers Online LIVE Interactive Classes where students are taught with the help of creative content and fun exercises that keep them engaged. Students can register for Vedantu’s LIVE Interactive session at a very affordable price and clear all their subject-related doubts. All the study materials provided by Vedantu are thoroughly checked by the expert team for quality assurance. These materials are regularly reviewed and updated as per the latest guidelines to avoid any irrelevancy. If you wish to improve your academic performance, think no more and join Vedantu. Download the Vedantu App and avail all of its offerings at the comfort of your home, on your mobile devices.

There are many online educational services that offer Class 9 CBSE NCERT Solution . It is crucial to choose the right online platform that provides 100% accurate NCERT Solutions. Students should make an informed decision regarding the platform they want to choose for procuring all the necessary study materials. Vedantu’s online learning solutions ensure that you can avail the best study materials and expert guidance without travelling far to coaching classes. Get all the necessary assistance whenever you want! You can get all your doubts cleared with the help of the excellent mentoring team by registering with Vedantu. Vedantu is known to provide accurate and reliable NCERT Solution and other study materials to help you prepare for the exam. So, what are you waiting for? Grab your solution and prepare for exams.

Benefits of Downloading 9th Science Book Back Answers

The following are some of the main benefits of downloading NCERT Solutions Class 9 Chapter Wise Solutions.

All the NCERT Solutions for Class 9 have been prepared by experts at Vedantu in an easy-to-understand language. So, students will have no trouble learning the topics and understanding the concept of the chapters.

The Vedantu experts have created all the solutions for NCERT Class 9 Science chapters by following the CBSE guidelines. These solutions have been explained properly, using a step-by-step format. In this way, students will be able to tackle all the difficult questions easily and that too according to CBSE marking scheme.

All the fundamentals have been completely covered in the NCERT solutions. These solutions have been described using the rules, concepts, and principles from the particular chapters. Our experts have actually provided the solutions to make sure that students are able to delve deeper into the subject and get to know the meaning of different laws, processes, and equations.

The syllabus of Class 9 Science is really wide, consisting of many important chapters. These chapters include some advanced concepts that might be difficult for students to understand. So, in case there are any areas where you might have some doubts, NCERT solutions can be your guide. Students can figure out the topics that they need to learn more about and rectify their mistakes by comparing their solutions to the ones provided in the PDF files.

NCERT Science Book Class 9 Solutions PDF Free Download For Better Results

Visit the official website of Vedantu and download the NCERT Solutions for the Class 9 Science textbook chapters. Vedantu is one of the most trusted ed-tech platforms to find the best study materials. Students can use the NCERT Class 9 Science solutions to complete their syllabus and learn about different chapters in the book. They can use these solutions as study materials to boost their exam preparation.

Important Related Links for NCERT Class 9

CBSE Class 9 Revision Notes

NCERT Books for Class 9

Important Questions for CBSE Class 9

NCERT Exemplar Solutions for Class 9

CBSE Class 9 Syllabus

FAQs on NCERT Solutions For class 9 Science

1. How to Prepare for CBSE Class 9 Science?

The best way to evaluate your progress before an exam is solving as many question sets as possible. It will strengthen your knowledge of concepts as well as increase your efficiency in providing prompt answers.

Besides explanations and keys, class 9 NCERT Science solution also comes with practice exercises formulated by learned scholars to help you improvise on your reasoning skills which is very crucial for a subject like Science. You can also refer to NCERT class 9 Science solutions for last minute notes and suggestions.

2. How many chapters are there in the class 9 NCERT solution?

The NCERT solutions for class 9 science carry all 15 chapters. These chapters are framed by Vedantu in-house subject experts, covering all the fundamental concepts that will help in scoring higher marks.

3. Is this solution enough to prepare for the exam?

Yes, the NCERT solutions for class 9 science available in PDF format are enough to prepare for the exam. These solutions are accurate and in detail, prepared according to the CBSE guidelines. Students don't have to worry about the authenticity of the solution.

4. Where can I get the NCERT Solutions for Class 9 Science?

Follow these steps to download the NCERT Solutions for Class 9 Science -

Click on the NCERT Solutions for Class 9 Science Link.

On this page, you will find the chapter-wise NCERT Solutions for Class 9. You can click on the chapter name for which you want the solutions.

On clicking the chapter’s name, you will be redirected to the next page from where you can download the PDF.

5. Are the NCERT Solutions for Class 9 Science sufficient for the exam preparation?

Yes. The NCERT textbook is the best resource for preparing for your Class 9 Science exam. Students should refer to the NCERT Solutions for Class 9 Science to learn all the concepts thoroughly. With these two resources, students can prepare for their exams and score well. They can also refer to other study material and resources available on Vedantu for additional practice and understanding.

6. What is the name of the Class 9 Science book?

The name of the Class 9 Science NCERT textbook is Science Textbook for Class 9. Students can download the Class 9 Science book from Vedantu. They can also download chapter-wise NCERT Solutions for Class 9 Science. They can download several other study materials for all subjects of Class 9, including NCERT Solutions, Chapter PDFs, Reference Books, Revision Notes, and Important Questions. Students can also use Vedantu's app to download the resources. All resources are available free of cost.

7. What is Sol in Chemistry according to the syllabus of Class 9th?

A colloid wherein small solid particles get dispersed in a liquid medium is called sol. An example of sol is an ink and soap solution. It is a heterogeneous mixture wherein one can see suspension easily. It is stable and does not scatter a beam of light. When left undisturbed, the solute particles in a sol will settle down. This concept is from the Chemistry part of Class 9 Science.

8. How many chapters are there in the NCERT Solutions Class 9 Science?

In the Class 9 Science NCERT textbook, there are 15 chapters. These are -

Matter in Our Surroundings

Is Matter Around Us Pure

Atoms and Molecules

Structure of The Atom

The Fundamental Unit of Life

Diversity in Living Organisms

Force and Laws of Motion

Gravitation

Work and Energy

Why Do We Fall ill

Natural Resources

Improvement in Food Resources

NCERT SOLUTIONS FOR CLASS 9

Cbse class 9 study materials, home tuitions in india.

AssignmentsBag.com

Motion Chapter 8 Class 9 Science Assignments

Please refer to Motion Chapter 8 Class 9 Science Assignments below. We have provided important questions and answers for Motion which is an important chapter in Class 9 Science. Students should go through the notes and also learn the solved assignment with solved questions provided below. All examination and class tests questions are as per the latest syllabus and books issued by CBSE, NCERT, and KVS. We have also provided Class 9 Science Assignments for all chapters on our website.

Chapter 8 Motion Class 9 Science Assignments

Question. When is the acceleration of a body positive?

The acceleration of a body is taken to be positive if it is in the direction of velocity.

Question. What is the relationship between distance travelled and the time elapsed for the motion with uniform velocity?

Distance is directly proportional to time used. In fact, distance travelled = Uniform velocity × Time used.

Question.Name the different types of graph.

Bar graphs, straight line graphs, histograms, etc.

Question. Which type of graph is used to describe motion?

Line graph are used to describe the motion of an object.

Question. Define the term velocity. What is its unit? Is it a scalar or vector quantity?

Velocity is a physical quantity that gives the speed and direction of motion of the body Velocity = Displacement/ Time The S.I. unit of velocity is ms–1. Velocity is a vector quantity because its description requires both magnitude and direction.

Question.  Name the two types of physical quantities.

The two types of physical quantities are scalar quantity and vector quantity.

Question. What is the acceleration of a body moving uniform velocity?

The acceleration of a body moving with uniform velocity is zero.

Question. What is magnitude?

The numerical value of a physical quantity is called its magnitude.

Question. Define a scalar quantity.

A physical quantity which has only magnitude and no direction is called a scalar quantity.

Question. What is the difference between uniform linear motion and uniform circular motion? Answer.  When a body is moving with a uniform speed along a straight line, its motion is called linear uniform motion. The uniform linear motion is an accelerated motion. When a body is moving with a constant speed along a circular path, the direction of motion of body changes continuously with time. We know that a change in the direction of motion implies a change in velocity. Thus, uniform circular motion is an accelerated motion even though the speed of the body remains constant.

Question.Why is the motion in a circle at constant speed called accelerated motion? Answer.  When a body moves along a circular path with a constant speed, its direction of motion at any point is along the tangent to the circle at that point, this motion called accelerated motion. The direction of motion changes as the body moves in a circle and causes a change in the velocity. Therefore, the motion of an object along a circular path is an accelerated motion.

Question.What do graphs provide? Answer.  The graphs provide a convenient method to present pictorially the basic information about a variety of events such as motion.

Question.Give an example of use of bar graph and straight graph. Answer.  In telecast of one-day cricket match on T.V. vertical bar graphs show the run rate of a team in over. Straight line graph helps in solving linear equation in two variables.

Question.When do we say that the position of body has changed? Answer. If the distance, or direction, or both of a body relative to a reference point changes then we say that the position of the body has changed.

Question.Classify the following as scalar and vector quantities : Mass, weight, time, temperature, volumes, velocity, speed, forces, acceleration. Answer.

Question.Define uniform acceleration. Give one example. Answer.  Uniform acceleration : An object has a uniform acceleration if it travels in a straight line and its velocity increases or decreases by equal amounts in equal intervals of time. For example : The motion of a freely falling body has uniform acceleration.

Question.In a long distance race, the athletes were expected to take four rounds of the track such that the line of finish was same as the track was 200 m. (i) What is the total distance to be covered by the athletes? (ii) What is the displacement of the athletes when they touch the finish line? (iii) Is the motion of the athletes uniform or nonuniform? (iv) Is the distance moved by and displacement of athletes at the end of the race equal? Answer. (i) Total distance covered by the athletes = 4 × 200 = 800 m. (ii) The line of start and the line of finish are the same so, Displacement = 0 (iii) The motion of the athletes is non-uniform. (iv) The distance and displacement of an athlete at the end of the race are not equal.

Question.(i) Give an example of a body which may appear to be moving for one person and stationary for the other. (ii) What can we tell about motion from the above example? Answer. (i) The man standing on the roadside observe that a bus along with its passenger is moving.At the same time, a passenger sitting in the bus observes his fellow passenger to be at rest. (ii) We can tell that motion is relative.

Question.How many different kinds of motion are there? Name them. Is there any motion which is a combination of two or more types of motion? Answer. (i) There are three kinds of motion. These are : (a) Linear or translatory motion. (b) Circular or rotational motion. (c) Vibratory or oscillatory motion. (ii) Complex motion means a combination of two or more types of motions.

Question.What is motion? Give some examples of directly perceivable motion in daily life. Answer. (i) A body is said to be in motion if it changes its position in relation to a reference point (origin). (ii) Some examples of directly perceivable motion in daily life are : (a) Birds and animals moving from one place to another. (b) Cars moving on the roads. (c) Aeroplanes flying in the sky. (d) Blades of a moving fan. (e) Fish swimming in water.

Question. Find the distance covered by a particle during the time interval t = 0 to t = 20 s for which the speedtime graph is shown in figure.

Answer. The distance covered in the time interval 0 to 20 s is equal to the area of the shaded triangle. So, Distance = 1/2 × base × height = 1/2 × (20 s) x (20 m/s) = 200 m.

Question. A bus moves 30 km in 30 min and the next 30 km. in 40 min. Calculate the average speed for the entire journey. Answer. Given, the total time taken is 30 min + 40 min = 70 min and the total distance travelled is 30 km + 30 km = 60 km The average speed is

Question. A girl runs for 10 min at a uniform speed of 9 km/h. What should be the speed that she runs for the next 20 min, so that the average speed comes to 12 km/h? Answer. Total time = 10 min 20 min = 30 min The average speed is 12 km/h using s = vt, the distance covered in 30 min is

Thus, he has to cover 6 km – 1.5 km = 4.5 km in the next 20 min. The speed required is

Question. It is estimated that the radio signal takes 1.27 seconds to reach the Earth from the surface of the Moon.Calculate the distance of the Moon from the Earth. Speed of radio signal = 3 × 108 ms –1  (speed of light in air). Answer. Here, time = 1.27 s Speed = 3 × 108 ms –1 Distance = ? Using distance = speed × time, we get Distance = 3 × 108 ms –1  × 1.27 s = 3.81 × 10 8  m = 3.81 × 10 5  km

Question. Divya walked 2 km on a straight road and then walked back 1 km. Which of the two quantities involved in her walking is greater- the scalar or vector? Answer. Distance travelled by Divya = 2 km + 1 km = 3 km Displacement = 2 km  –  1 km = 1 km Hence, distance which is a scalar quantity is greater than the displacement which is a vector quantity.

Question.   Two satellites A and B revolve around a planet C. The time taken by satellite B to go around the planet is twice the time taken by A. Which of the two satellites will have a greater magnitude of velocity? Answer. Satellite A will have greater magnitude of velocity since velocity is inversely proportional to time. (v = 2p r/t)

Question.   A child moving on a circular track of radius 40 m completes one revolution in 5 minutes. What is his (i) average speed (ii) average velocity in one full revolution? Answer.  Distance travelled in one revolution,2p r =2p × 40m Displacement in one revolution = 0 Time taken = 5 minutes = 5 × 60s

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NCERT is on the priority list of recommendation of the Central Board of Secondary Education (CBSE). Here, you will find all the chapter-wise NCERT Solutions for Class 9 Science. It will help you to understand the subject and perform well in exams.

Class 9 Science is divided into 3 parts – Physics, Chemistry, Biology.

NCERT Solutions for Class 9 Science will help you to ace the unsolved problems in the Class 9 Science book prescribed by the NCERT for all the schools of CBSE. A thorough understanding of the NCERT Solutions for Class 9 Physics helps you in understanding Physics concepts to the point. The NCERT Solutions for Class 9 Science cover all the 5 chapters of the prescribed Physics syllabus and are the best alternative.

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NCERT Solutions for Class 9 Science Chapterwise

Class 9 Science Chapter 1 – Matter in our Surroundings

Class 9 Science Chapter 2 – Is Matter Around Us Pure

Class 9 Science Chapter 3 – Atoms and Molecules

Class 9 Science  Chapter 4 – Structure of the Atom

Class 9 Science Chapter 5 – Fundamental Units of Life

Class 9 Science Chapter 6 – Tissues

Class 9 Science Chapter 7 – Diversity in Living Organisms

Class 9 Science Chapter 8 – Motion

Class 9 Science Chapter 9 – Force And Laws Of Motion

Class 9 Science Chapter 10 – Gravitation

Class 9 Science Chapter 11 – Work and Energy

Class 9 Science Chapter 12 – Sound

Class 9 Science Chapter 13 – Why do we fall ill?

Class 9 Science Chapter 14 – Natural Resources

Class 9 Science Chapter 15 – Improvement in Food Resources

NCERT Solutions for Class 9 Science Chapter 1: Matter in our Surroundings

Matter is an important part of our planet as our whole planet is made up of matter. This chapter provides a good amount of information about the matter. It includes the importance of matter based on the chemical and physical properties of matter. The physical nature of the matter will help the students to understand the concept of matter on the basis of its practical use in daily life. The chapter also explains some concepts like evaporation, boiling point, freezing point, etc. along with the factors affecting them.

NCERT Solutions for Class 9 Science Chapter 2: Is Matter Around Us Pure

In the present era, it believed that purity in anything is hardly seen. It is because of the presence of high level of pollutants everyone. In the context of the matter, it also holds true. In this chapter, the students will be able to learn about various concepts like solutions, pure substances, mixtures, suspensions, colloidal, etc. Moreover, this chapter talks about Homogenous substances and Heterogeneous Substances.

NCERT Solutions for Class 9 Science Chapter 3: Atoms and Molecules

In previous classes, students have already read about the presence of atoms as a part of the material. It showed them the divisibility of matter. Atom is the smallest thing or unit present on this planet. In this chapter, the students will be able to learn more about the molecules. This chapter highlights concepts like molecules of compounds, molecules of elements, etc. This chapter also talks about the presence of ions, Law of Conservation of Energy, Law of Chemical Combination, Dalton’s Atomic Theory, etc.

NCERT Solutions for Class 9 Science Chapter 4: Structure of the Atom

One of the most famous theories or models regarding atoms is given by J.J. Thomson. In this chapter, the students will learn about his model along with the drawbacks. It helps to understand the divisibility of atoms. It states that atoms are made of charged particles viz. electrons, protons, neutrons, etc. In the end, the students will learn about the atomic number, atomic mass, mass number, isotopes, isobars, etc

NCERT Solutions for Class 9 Science Chapter 5 Fundamental Units of Life

Robert Hooke was the first person to prepare a microscope and see a cell. A cell is the basic fundamental unit of life. In this chapter, students will learn the structures and functions of different cells. Moreover, the effect of hypotonic, isotonic, and hypertonic solutions on a cell.

NCERT Solutions for Class 9 Science Chapter 6 Tissues

This chapter helps the students to learn about the various types of Tissues in Plants like Merismatic Tissue and Permanent tissue. Moreover, in the end, the chapter highlights topics like Position of plant tissues, a section of a stem, guard cells, etc.

NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms

There are various life forms on this planet and it becomes very essential to study all of them. In chapter helps students to know about the various groups of organisms. Aristotle has done the classification of animals on the basis of land, air, and water, etc. There are certain terms related to the classification which the students will confront are Kingdom, Phylum, Class, Order, Family, Genus, Species, etc.

NCERT Solutions for Class 9 Science Chapter 8 Motion

Here, you will learn about motion including motion along a straight line, types of motion, the difference between Vector & Scalar, Speed & Velocity, Distance & Displacement, Acceleration – Rate of change of velocity and average speed and velocity, Graphical representation of motion and derivation of three equation of motion.

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion

In this chapter, you will learn the concept of balance and unbalance forces. Starting with the First law of motion, the Galileo’s concept, the law of inertia. You will also learn the Second law of motion and Third law of motion, momentum, rate of change of momentum. And applications on first, second and third laws of motion.

NCERT Solutions for Class 9 Science Chapter 10 Gravitation

This chapter gravitation takes you through the depths of motion of objects under the influence of gravitational force on the earth. Gravitational force and Newton’s universal law of gravitation.

NCERT Solutions for Class 9 Science Chapter 11 Work and Energy

In this chapter, you will learn about the relationship between work and energy, scientific conception of work and also different forms of energy such as Kinetic energy, Potential energy, application of kinetic and potential energy, and energy of an object at a certain height.

NCERT Solutions for Class 9 Physics Chapter 12 Sound

This chapter is a very interesting one as you will get to learn about the Reflection of Sound i.e ECHO, reverberation, and applications of multiple reflections of sound. All these concepts are taught by implementing various activities needed to be done in the Physics laboratory that makes the learning process more effective and interactive.

NCERT Solutions for Class 9 Science Chapter 13 Why do we fall ill?

Health and Diseases are the two most important topics of discussion in this present world. This chapter highlights Health and its significance, reasons why do we fall ill, etc. Along with this, this chapter discusses the distinction between a healthy person and disease-free person.

NCERT Solutions for Class 9 Science Chapter 14 Natural Resources

This chapter highlights the most important element of life: Air. Starting with the role of the atmosphere in climatic control, this chapter deals with topics like how air moves, winds, rain, and air pollution. While discussing the topic of Air pollution, the chapter states various pollutants of the same. Moreover, in the end, the chapter, states various solutions to the problem.

NCERT Solutions for Class 9 Science Chapter 15 Improvement in Food Resources

This chapter deals with concepts like Crop Yield. Along with that, the chapter discusses the improvement in Crop Yield and related topics. Improvement in livestock and food crops are also discussed. The chapter also discusses topics like the ways to improve crop yield, crop production improvement, etc.

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NCERT Solutions for Class 9

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CBSE Worksheets for Class 9 Science

CBSE Worksheets for Class 9 Science: One of the best teaching strategies employed in most classrooms today is Worksheets. CBSE Class 9 Science Worksheet for students has been used by teachers & students to develop logical, lingual, analytical, and problem-solving capabilities. So in order to help you with that, we at WorksheetsBuddy have come up with Kendriya Vidyalaya Class 9 Science Worksheets for the students of Class 9. All our CBSE NCERT Class 9 Science practice worksheets are designed for helping students to understand various topics, practice skills and improve their subject knowledge which in turn helps students to improve their academic performance. These chapter wise test papers for Class 9 Science will be useful to test your conceptual understanding.

Board: Central Board of Secondary Education(www.cbse.nic.in) Subject: Class 9 Science Number of Worksheets: 30

CBSE Class 9 Science Worksheets PDF

All the CBSE Worksheets for Class 9 Science provided in this page are provided for free which can be downloaded by students, teachers as well as by parents. We have covered all the Class 9 Science important questions and answers in the worksheets which are included in CBSE NCERT Syllabus. Just click on the following link and download the CBSE Class 9 Science Worksheet. CBSE Worksheets for Class 9 Science can also use like assignments for Class 9 Science students.

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• CBSE Worksheets for Class 9 Science Force and Laws of Motion Assignment
• CBSE Worksheets for Class 9 Science Fundamental Unit of Life Assignment
• CBSE Worksheets for Class 9 Science Gravitation Assignment
• CBSE Worksheets for Class 9 Science Improvement in Food Resources Assignment 1
• CBSE Worksheets for Class 9 Science Improvement in Food Resources Assignment 2
• CBSE Worksheets for Class 9 Science Law of Conservation of Mass Assignment
• CBSE Worksheets for Class 9 Science Matter around Us Assignment
• CBSE Worksheets for Class 9 Science Melting and Boiling Point Assignment
• CBSE Worksheets for Class 9 Science Physical and Chemical Changes Assignment
• CBSE Worksheets for Class 9 Science Preparation of Mixture and Compound Assignment
• CBSE Worksheets for Class 9 Science Seperation of Components of Mixture Assignment
• CBSE Worksheets for Class 9 Science Sound Assignment
• CBSE Worksheets for Class 9 Science Structure of Atom Assignment
• CBSE Worksheets for Class 9 Science Tissues Animals Assignment
• CBSE Worksheets for Class 9 Science Tissues Plants Assignment
• CBSE Worksheets for Class 9 Science Why do we fall Ill Assignment
• CBSE Worksheets for Class 9 Science Assignment 1
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• CBSE Worksheets for Class 9 Science Assignment 3
• CBSE Worksheets for Class 9 Science Assignment 4
• CBSE Worksheets for Class 9 Science Assignment 5
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• CBSE Worksheets for Class 9 Science Assignment 7
• CBSE Worksheets for Class 9 Science Assignment 8
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Advantages of CBSE Class 9 Science Worksheets

• By practising NCERT CBSE Class 9 Science Worksheet , students can improve their problem solving skills.
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Worksheets of CBSE Class 9 Science are devised by experts of WorksheetsBuddy experts who have great experience and expertise in teaching Maths. So practising these worksheets will promote students problem-solving skills and subject knowledge in an interactive method. Students can also download CBSE Class 9 Science Chapter wise question bank pdf and access it anytime, anywhere for free. Browse further to download free CBSE Class 9 Science Worksheets PDF .

Now that you are provided all the necessary information regarding CBSE Class 9 Science Worksheet and we hope this detailed article is helpful. So Students who are preparing for the exams must need to have great solving skills. And in order to have these skills, one must practice enough of Class 9 Science revision worksheets . And more importantly, students should need to follow through the worksheets after completing their syllabus.  Working on CBSE Class 9 Science Worksheets will be a great help to secure good marks in the examination. So start working on Class 9 Science Worksheets to secure good score.

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Motion Chapter 8 Class 9 Science Worksheets

Students should practice questions given in Motion Chapter 8 Class 9 Science Worksheets. These worksheets for Class 9 Science have a good collection of important questions and answers which are expected to come in your class tests and examinations. You should learn these solved worksheet questions for Science Class 9 as it will help you to understand all topics and give you more marks.

Class 9 Science Worksheets Chapter 8 Motion

Please refer to below questions and answers for Motion Chapter 8 Class 9 Science Worksheets. Prepared by expert teachers for Standard 9 Science

Question. Give two examples of a vector quantity?

Two examples of a vector quantity are displacement and velocity.

Question. Define acceleration. Is it a scalar or a vector quantity?

In non-uniform motion, the velocity of a body changes with time. It has different velocities at different instants of time and at different points of its path. In such a situation, we define a physical quantity called acceleration which is a measure of the change in the velocity of a body per unit time. It is a vector quantity.

Question. What is the Si unit of acceleration?

The SI unit of acceleration is m/s 2 .

Question. Give two examples of a scalar quantity.

Two examples of a scalar quantity are distance and speed.

Question. Define vector quantity.

A physical quantity which has both magnitude and direction is called a vector quantity.

Question. Differentiate acceleration from velocity.

Velocity is the change in position of a body per unit time in a given direction and acceleration is the change in velocity of a body per unit time.

Question.“The direction in which an object moves is given by the direction of velocity of the object and not the direction of acceleration.” Give an example to justify this statement.

When an object is thrown upward, its velocity is directed upward while its acceleration is directed downwards. Thus, the velocity determines the direction of motion.

Question.Give the simplest type of motion.

The simplest type of motion is the motion along a straight line.

Question.Define non-uniform acceleration. Give one example. Answer. Non-uniform acceleration : An object has non-uniform acceleration if it travels in a straight line and its velocity increases or decreases by unequal amounts in equal intervals of time. For example : The movement of a car on a busy road has non-uniform acceleration.

Question.A satellite revolves round the Earth with uniform speed. Is this motion accelerated? If so, in which direction does the acceleration act? Answer.  The velocity of the satellite revolving around the Earth changes due to change in its direction of motion. So, the motion of satellite is an accelerated one. The acceleration is directed towards the centre of the Earth.

Question.When is the acceleration of a body is negative? Answer. The acceleration of a body is taken to be negative when it is opposite to the direction of velocity.

Question.Define the following : (i) Translatory motion (ii) Complex motion Answer. (i) When a body moves along a straight line, its motion is called rectilinear or translatory motion. For example : A car moving on a straight road. (ii) When a body has two or more types of motion, it is said to possess complex motion. For example : A ball rolling down on inclined planes has both rectilinear as well as circular motion.

Question.(i) Give some examples of erratic and uncontrolled motion. (ii) Give an example of controlled motion which can be a service to human beings. (iii) Is there a need to study about the erratic which of some objects and learn to control them? Answer. (i) Flooded river, a hurricane, a tsunami, etc. (ii) Controlled motion of a river in a dam is useful to generate hydroelectric power. (iii) Yes, we should study about the erratic motion of some objects because it will help us in disaster management.

Question.What is the meant by retardation? Give its S.I. unit. or Give an example of negative acceleration. Answer. Retardation : When the velocity of a body decreases with time, its final velocity is less than the initial velocity, i.e. its acceleration is negative. This negative acceleration is called retardation. The S.I. unit of retardation is ms 2 . Example : When brakes are applied to a moving car, its velocity gradually decreases. Under these conditions, the car is under retardation.

Question.How does the velocity change with time in uniform rectilinear motion of an object? Answer. In uniform rectilinear motion of an object, the velocity is constant with time, i.e. change in velocity of the object during any time interval is zero.

Question. (i) Give an example of motion in human body which cannot be perceived directly. (ii) Give an example of motion in nature which cannot be perceived directly. (iii) Give an example of motion of the Earth which cannot be perceived directly. Answer. (i) The motion of blood through veins and arteries in human body cannot be perceived directly. (ii) The motion of air is not perceived directly. We perceive it by observing the movement of dust or leaves of trees, etc. (iii) The phenomena of sunrise, sunset and change of seasons is due to rotation and revolution of the Earth which cannot be perceived directly.

Question.How does the velocity change with time in nonuniform rectilinear motion of an object? Answer. The velocity has different values at different instant of time and at different points of its path, i.e. change in velocity of the object during any time interval is not zero.

Question.How can we represent the change in the position of an object with time? Answer. The change in the position of an object with time can be represented on the distance-time graph by adopting a convenient scale of choice.

In this graph, time is taken along x-axis and distance is taken along y-axis.

Question.A person moves along the boundary of a square field of side 10 m in 20 s. What will be the magnitude of displacement of that person at the end of 2 minutes 20 seconds? Answer. Side of square field = 10 m So, perimeter = 10 m × 4 = 40 m Person moves along the boundary in 20 sec. Displacement after 2 m 20 sec = 2 × 60 s + 20 s = 140 s = ? Since in 20 s person moves 40 m. Therefore, in 1 sec distance covered 40/20 = 2 m Therefore, in 140 sec distance covered = 2 × 140 = 280 m Now, number of rotation to cover 240 along the boundary = Total distance/Perimeter = 280m/40m = 7 rounds.

Hence, after 7 rounds the person will be at the starting point, so displacement will be zero.

Question.Neha swims in a 90 m long pool. She covers 180 m in one minute by swimming from one end to the other and back along the same straight path. Find the average speed and average velocity of Neha. Answer. Total distance = 180 m Total displacement = 0 Time taken t = 1 min = 60 s Average speed (Vav) = Total distance/Total time taken =180m/60s = 3m/s Average velocity (Vav) = Displacement/Total time taken = 0/60 s = 0 m/s

Question.A car decreases its speed from 80 km/h to 60 km/h is 5 seconds. Find the acceleration of the car. Answer. u = 80 km/h = 80 × 5/18 = 22.22 m/s v = 60 km/h = 60 × 5/18 = 16.67 m/s Time (t) = 5 s

–1.11 m/s 2

Question.A train starting from a railway station and moving with uniform acceleration, attains a speed 40 km/h in 10 minutes. Find its acceleration. Answer. u = 0 (starting from rest) v = 40 km/h= 11.11 m/s Time t = 10 minutes = 600 s

Question.The average speed of a bicycle, an athlete and car are 18 km/h, 7 m/s and 2 km/min respectively. Which of the three is the fastest and which is the slowest? Answer.

Thus, the average speeds of the bicycle, the athlete and the car are 5 m/s, 7 m/s and 33.3 m/s respectively.So, the car is the fastest and the bicycle is the slowest.

Question.Figure shows distance-time graph of two objects A and B, which object is moving with greater speed when both are moving? Answer.

The line for object B makes a longer angle with the time-axis. Its slope is longer than the slope of the line for object A. Thus, the speed of B is greater than that of A.

Question.Figure represents the speed time graph for a particle. Find the distance covered by the particle between t = 10 min and t = 30 min.

Answer. We draw perpendicular lines from the 10-minute point and the 30-minute point to the time-axis (fig.). The distance covered is equal to the area of the rectangle ABCD, its value is ABCD = (30 min – 10 min) x (10 km/h) = 20 min × 10 km/h

Download Free Worksheets for Chapter 8 Motion Class 9 Science

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CBSE Worksheets for Class 9 Science

CBSE Worksheets for Class 9 Science: One of the best teaching strategies employed in most classrooms today is Worksheets. CBSE Class 9 Science Worksheet for students has been used by teachers & students to develop logical, lingual, analytical, and problem-solving capabilities. So in order to help you with that, we at CoolGyan have come up with Kendriya Vidyalaya Class 9 Science Worksheets for the students of Class 9. All our CBSE NCERT Class 9 Science practice worksheets are designed for helping students to understand various topics, practice skills and improve their subject knowledge which in turn helps students to improve their academic performance. These chapter wise test papers for Class 9 Science will be useful to test your conceptual understanding. Board: Central Board of Secondary Education(www.cbse.nic.in) Subject: Class 9 Science Number of Worksheets: 30

CBSE Class 9 Science Worksheets PDF

All the CBSE Worksheets for Class 9 Science provided in this page are provided for free which can be downloaded by students, teachers as well as by parents. We have covered all the Class 9 Science important questions and answers in the worksheets which are included in CBSE NCERT Syllabus. Just click on the following link and download the CBSE Class 9 Science Worksheet. CBSE Worksheets for Class 9 Science can also use like assignments for Class 9 Science students.

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• CBSE Worksheets for Class 9 Science Why do we fall Ill Assignment
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• CBSE Worksheets for Class 9 Science Assignment 5
• CBSE Worksheets for Class 9 Science Assignment 6
• CBSE Worksheets for Class 9 Science Assignment 7
• CBSE Worksheets for Class 9 Science Assignment 8
• CBSE Worksheets for Class 9 Science Assignment 9
• CBSE Worksheets for Class 9 Science Assignment 10

Advantages of CBSE Class 9 Science Worksheets

• By practising NCERT CBSE Class 9 Science Worksheet , students can improve their problem solving skills.
• Helps to develop the subject knowledge in a simple, fun and interactive way.
• No need for tuition or attend extra classes if students practise on worksheets daily.
• Working on CBSE worksheets are time-saving.
• Helps students to promote hands-on learning.
• One of the helpful resources used in classroom revision.
• CBSE Class 9 Science Workbook Helps to improve subject-knowledge.
• CBSE Class 9 Science Worksheets encourages classroom activities.

Worksheets of CBSE Class 9 Science are devised by experts of CoolGyan experts who have great experience and expertise in teaching Maths. So practising these worksheets will promote students problem-solving skills and subject knowledge in an interactive method. Students can also download CBSE Class 9 Science Chapter wise question bank pdf and access it anytime, anywhere for free. Browse further to download free CBSE Class 9 Science Worksheets PDF . Now that you are provided all the necessary information regarding CBSE Class 9 Science Worksheet and we hope this detailed article is helpful. So Students who are preparing for the exams must need to have great solving skills. And in order to have these skills, one must practice enough of Class 9 Science revision worksheets . And more importantly, students should need to follow through the worksheets after completing their syllabus. Working on CBSE Class 9 Science Worksheets will be a great help to secure good marks in the examination. So start working on Class 9 Science Worksheets to secure good score.

CBSE Worksheets For Class 9

• CBSE Notes For Class 9
• Class 9 Science Notes
• Chapter 8: Motion

Motion Class 9 CBSE Notes - Chapter 8

According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 7.

CBSE Class 9 Science Chapter 8 Motion Notes

In Class 9 Science Chapter 8 Motion, students learn to describe the motion of objects along a straight line and express such motions through simple equations and graphs. The chapter also discusses ways of describing circular motion.

Chapter Summary Video

Understanding Motion

Reference point and reference frame.

• To describe the position of an object, we need a reference point or origin. An object may seem to be moving to one observer and stationary to another.
• Example: A passenger inside a bus sees the other passengers to be at rest, whereas an observer outside the bus sees the passengers to be in motion.
• In order to make observations easy, a convention or a common reference point or frame is needed. All objects must be in the same reference frame.

For more information on Motion, watch the below videos

To know more about the frame of reference, visit here .

Distance and Displacement

The magnitude of the length covered by a moving object is called distance. It has no direction.

Displacement is the shortest distance between two points or the distance between the starting and final positions with respect to time. It has magnitude as well as direction.

Displacement can be zero, but distance cannot.

To know more about Distance and Displacement, visit here .

Magnitude is the size or extent of a physical quantity. In physics, we have scalar and vector quantities.

Scalar quantities are only expressed as magnitude. E.g.: time, distance, mass, temperature, area, volume

Vector quantities are expressed in magnitude as well as the direction of the object. E.g.: Velocity, displacement, weight, momentum, force, acceleration, etc.

Time, Average Speed and Velocity

Time and speed.

Time is the duration of an event that is expressed in seconds. Most physical phenomena occur with respect to time. It is a scalar quantity.

Speed is the rate of change in distance. If a body covers a certain distance in a certain amount of time, its speed is given by

The instantaneous speed is the speed of an object at a particular moment in time.

Average speed is stated as the distance covered by the object within a period of time.

Average speed = Total distance travelled / Total time taken

The below table lists the difference between Average Speed and Instantaneous Speed.

Uniform motion and Non-uniform motion

When an object covers equal distances in equal intervals of time, it is in uniform motion.

Examples of Uniform Motion

• Movement of the ceiling fan’s blades.
• Motion of Earth around the sun
• Pendulum with equivalent amplitude on either side

When an object covers unequal distances in equal intervals of time, it is said to be in non-uniform motion.

• Bouncing ball
• Running horse
• Moving train

To know more about Uniform Motion and Non-Uniform Motion, visit here .

The Rate of change of displacement is velocity. It is a vector quantity. Here the direction of motion is specified.

Instantaneous velocity is the rate of change of position for a time interval which is very small, i.e. almost zero. In more simple words, the velocity of an object at a given instant of time is known as instantaneous velocity.

Average velocity is defined as the displacement (∆x) divided by the time intervals (∆t) in which the displacement occurs.

For more information on Average Speed and Velocity, watch the below video

To know more about Average Speed and Average Velocity, visit here .

Acceleration

The rate of change of velocity is called acceleration. It is a vector quantity. In non-uniform motion, velocity varies with time, i.e., the change in velocity is not 0. It is denoted by “a”

A c c e l e r a t i o n   =  Change in Velocity / Time

Where t (time taken), v (final velocity) and u (initial velocity).

To know more about Acceleration, visit here .

Motion Visualised

Distance-time graph.

• Distance-Time graphs show the change in the position of an object with respect to time.
• Linear variation = uniform motion and non-linear variations imply non-uniform motion
• The slope gives us speed

• OA implies uniform motion with constant speed as the slope is constant
• AB implies the body is at rest as the slope is zero
• B to C is a non-uniform motion

To know more about Distance-Time Graph, visit here .

Velocity-Time Graph

• Velocity-Time graphs show the change in velocity with respect to time.
• Slope gives acceleration
• The area under the curve gives displacement
• Line parallel to x-axis implies constant velocity-

OA = constant acceleration, AB = constant velocity, BC = constant retardation

To know more about Velocity-Time Graph, visit here .

Equations of Motion

The motion of an object moving at uniform acceleration can be described with the help of three equations, namely

(i) v = u + at

(ii) v 2 – u 2 = 2as

(iii) s = ut + (1/2)at 2

where u is the initial velocity, v is the final velocity, t is the time, a is the acceleration and s is the displacement.

To know more about Equations of Motion, visit here .

Derivation of Velocity-Time Relation by Graphical Method

A body starts with some initial non-zero velocity at A and goes to B  with constant acceleration a.

From the graph BD = v (final velocity) – DC = u (initial velocity)…………..(eq 1).

BD = BC – DC……………..( eq 2 ).

Therefore   BD = at………………….(eq 3).

Substitute everything we get: at = v – u.

Rearrange to get v = u + at.

Derivation of Position-Time Relation by Graphical Method

A body starts with some initial non-zero velocity at A and goes to B  with constant acceleration a

Area under the graph gives Displacement as follows:

OA = u , OC = t and BD = at

Substituting in (eq 1) we get s = \(\begin{array}{l}ut + \frac{1}{2}at^{2}\end{array} \)

Derivation of Position-Velocity Relation by Graphical Method

Displacement covered will be the area under the curve which is the trapezium OABC.

We know the area of trapezium is 

OA = u and BC = v and OC = t

Substitute (eq 2) in (eq 1) and arrange to get

v 2 −u 2 =2as

Uniform Circular Motion

• If an object moves in a circular path with uniform speed, its motion is called uniform circular motion.
• Velocity changes as direction keeps changing.
• Acceleration is constant.
• The uniform circular velocity is given by the following formula: \(\begin{array}{l}v=\frac{2r}{t}\end{array} \)

Uniform Circular Motion Examples

• The motion of artificial satellites around the Earth is an example of uniform circular motion.
• The motion of electrons around its nucleus.
• The motion of blades of the windmills.
• The tip of the second hand of a watch with a circular dial shows uniform circular motion.

To know more about Uniform Circular Motion, visit here .

Frequently Asked Questions on CBSE Class 9 Science Notes Chapter 8 Motion

What is ‘motion’.

When any object moves from one point to another with respect to the observer, then this object is said to be in ‘motion’.

Is this chapter difficult?

If a student fully understands the concept of the chapter ‘motion’ and practises sums regularly, then they can score good marks in this chapter.

Are the derivations in this chapter difficult?

There are derivations in this chapter and these need to be practised constantly.

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