#### Laws of Motion Model Question Paper

10th Standard

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Science

Time : 01:30:00 Hrs
Total Marks : 50
5 x 1 = 5
1. Inertia of a body depends on

(a)

weight of the object

(b)

acceleration due to gravity of the planet

(c)

mass of the object

(d)

Both a & b

2. One kilogram force equals to

(a)

9.8 dyne

(b)

9.8 × 104 N

(c)

98 × 104 dyne

(d)

980 dyne

3. To project the rockets which of the following principle(s) is /(are) required?

(a)

Newton’s third law of motion

(b)

Newton’s law of gravitation

(c)

law of conservation of linear momentum

(d)

both a and c

4. The resistance of a body to change its state of rest is called

(a)

inertia of rest

(b)

inertia of motion

(c)

momentum

(d)

inertia of direction

5. The momentum of a heavy object at rest will be

(a)

large

(b)

infinity

(c)

zero

(d)

small

6. 5 x 1 = 5
7. To produce a displacement ___________ is required

()

force

8. By convention, the clockwise moments are taken as ___________ and the anticlockwise moments are taken as__________

()

negative and postive

9. A man of mass 100 kg has a weight of ___________ at the surface of the Earth

()

980 N

10. A body changes its state, then it is said to be in ______

()

motion

11. Momentum is a ______ quantity.

()

vector

12. 5 x 1 = 5
13. Newton’s I law

14. (1)

stable equilibrium of an object

15. Newton’s III law

16. (2)

Sum of clockwise moments = sum of anticlockwise moments

17. Principle of moments

18. (3)

FB = - FA

19. Newton's III law

20. (4)

Flying nature of bird

21. Kinetics

22. (5)

Cause of motion

4 x 1 = 4
23. Bodies of larger mass need greater effort to put them in motion. Why?

()

According to Newton's II law, F = ma.
For given acceleration a, if m is large, F should be more i.e., greater force.

24. A lift is accelerated upward. What is apparent weight of a person inside the lift?

()

The opposite weight will increase.

25. Action and reaction forces do not balance each other. Why?

()

This is because forces of action & reaction act alwayson the different bodies.

26. A boy puts a heavy box of mass M on his head and jumps down from the top of a multistoried building to the ground. How much is the force exerted by the box on his head during his force fall? Does the force of gravity increase during the fall?

()

F = mg1. No, the force of gravity does not increase.

27. 4 x 2 = 8
28. Assertion: The value of ‘g’ decreases as height and depth increase from the surface of the Earth.
Reason: ‘g’ depends on the mass of the object and the Earth.
Codes:
(a) If both the assertion and the reason are true and the reason is the correct explanation of assertion.
(b) If both the assertion and the reason are true, but the reason is not the correct explanation
of the assertion.
(c) If the assertion is true, but the reason is false.
(d) If the assertion is false, but the reason is true.

29. Assertion :A rocket moves forward by pushing the surrounding air backwards.
Reason: It drives the necessary thrust to move forward, according to Newton's second law.
Codes:
(a) Both assertion and reason are true and reason is correct explanation of assertion
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false
(d) Assertion is false but reason is true

30. Assertion : No force is required to move a body uniformly along a straight line.
Reason: Because F = ma = m(0) = 0.
Codes:
(a) Both assertion and reason are true and reason is correct explanation of assertion
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false
(d) Assertion is false but reason is true

31. Assertion : The net force acting on a body is zero.
Reason : The body is moving uniformly along a straight line.
Codes:
(a) Both assertion and reason are true and reason is correct explanation of assertion
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false
(d) Assertion is false but reason is true

32. 4 x 2 = 8
33. Differentiate mass and weight.

34. State the principle of moments.

35. State Newton’s second law.

36. What is meant by Apparent weight?

37. 2 x 4 = 8
38. A ball of mass 1 kg moving with a speed of 10 ms-1 rebounds after a perfect elastic collision with the floor. Calculate the change in linear momentum of the ball.

39. Give the application of torque.

40. 1 x 7 = 7
41. State Newton’s laws of motion?