10th Science - Physics Assignment Answers 2021

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10th Science | Physics Assignment Answers 2021

TN SCERT Full Answer Key 

10th Science Assignment Answers. 10th Science TN SCERT Assignment Answers, 10th Science Unit 1 TN SCERT Answer key 2021. 10th Standard All Subject TN SCERT Assignment Unit 1 Answers. TN SCERT Announced 1st to 12th All Subject Assignment Worksheets for Unit 1. Students Can Note that 10th science Unit 1 TNSCERT Assignment.  10th Assignment Answers, 9th Tamil Assignment Answers download PDF. 9th Maths Assignment Answers Unit 1 TNSCER Tamil Medium and English Medium.  

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10th Standard Science Unit 1 TN SCERT Assignment Answer key.


10th Science TN SCERT Unit 1 Answers


  • Class:10
  • Subject: Science | Physics
  • UNIT-1 Laws of motion

Part – A

I. Choose the correct answer

1. Inertia of a body depends on--------------

a) Weight of the object 

b) acceleration due to gravity 

c) mass of the object

d) Both a and b

Ans:  c) mass of the object

2. In a rocket, a large volume of gases produced by the combustion of fuel is allowed to escape through its tail nozzle in the downward direction with the tremendous speed and makes the rocket to move upward. Which principle is followed in this take off of the rocket?

a) Moment of inertia 

b) Conservation of momentum 

c) Newton’s first law of motion 

d) Newton’s law of gravitation

3. There are two statements

A) Newton’s first law is valid from the pilot in an aircraft which is taking off

B) Newton’s first law is valid from the observer in a train moving with constant velocity Which of the following is correct?

 a) A only 

b) B only 

c) Both A and B

d) Both A and B wrong

 4. Which of the following law is used to discover new stars and planets?

 a) Newton's first law

b) Newton's second law 

c) Newton's third law 

d) Newton's law of gravitation

5. The Resultant force of two equal parallel forces acting in opposite direction in the same line of action is

a) Fnet = F1 + F2 

b) Fnet = F2-F1 

c) Fnet = F2+F1 

d) Fnet=0

Part – B

 II. Short Answer

11. Define Inertia. Give its classification

The inherent property of a body to resist any change in its state of rest or the state of uniform motion, unless it is influenced upon by an external unbalanced force, is known as ‘inertia’.


  1. Inertia of rest
  2. Inertia of motion
  3. Inertia of direction

 12. If a 5N and a 15N forces are acting opposite to one another. Find the resultant force and the direction of action of the resultant force.

13. State Newton’s second law.

The force acting on a body is directly proportional to the rate of change of linear momentum of the body and the change in momentum takes place in the direction of the force.

Part – C

III. Write in Detail

18. What are the types of Inertia? Give an example for each type

Types of Inertia:

  • Inertia of rest: The resistance of a body to change its state of rest is called inertia of rest.

E.g.: When you vigorously shake the branches of a tree, some of the leaves and fruits are detached and they fall down (Inertia of rest).

  • The inertia of motion: The resistance of a body to change its state of motion is called inertia of motion.

E.g.: An athlete runs some distance before jumping. Because this will help him jump longer and higher. (Inertia of motion)

  • Inertia of direction: The resistance of a body to change its direction of motion is called inertia of direction.

E.g.: When you make a sharp turn while driving a car, you tend to lean sideways, (Inertia of direction).

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