21. Slope of velocity time graph is_____________________?

A. acceleration
B. distance
C. force
D. momentum

22. Which law of motion is also called law of inertia ?

A. 1st law
B. 2nd law
C. 3rd law
D. all 1st, 2nd and 3rd laws

23. Newtons laws do not hold good for particles_______________?

A. at rest
B. moving slowly
C. move with high velocity
D. move with velocity comparable to velocity of light

24. 2nd law of motion gives the definition of________________?

A. force
B. acceleration
C. velocity
D. both force and acceleration

25. Momentum depends upon__________________?

A. force acts on the body
B. mass of the body
C. velocity of the body
D. both mass and velocity of the body

26. When a body moves in a straight line then its displacement coincides with__________________?

A. distance
B. force
C. acceleration is zero
D. both A and B

27. Motorcycle safety helmet extends the time of collision hence decreasing the________________?

A. chance of collision
B. force acting
C. velocity
D. impulse

28. During long jump, athlete runs before taking the jump. By doing so he__________________?

A. provide him a larger inertia
B. decreases his inertia
C. decreases his momentum
D. increases his momentum

29. A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?

A. 14 m
B. 20 m
C. 5 m
D. 25 m

30. The SI unit of Heat is________?

A. Watt
B. Volt
C. Joule
D. Newton