20 A person is hurt on kicking a stone due to
(a) inertia
(b) velocity
(c) reaction
(d) momentum
21 If an object undergoes a uniform circular motion, then its
(a) acceleration remains uniform
(b) velocity changes
(c) speed changes
(d) velocity remains uniform
22 A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments
(a) is zero
(b) depends on the total mass of all the fragments (c) depends on the speeds of various fragments
(d) is infinity
23 While catching a ball, a player pulls down his hands to lower the
(a) force
(b) momentum
(c) impulse
(d) catching time
24 If the distance s is covered by a moving car in rectilinear motion with a speed v in time t is given by s =vt, then the car undergoes
(a) a uniform acceleration
(b a non-uniform acceleration
(c) a uniform velocity
(d) a non-uniform velocity
25 When a bucket of water is swung in a vertical circle, the water does not fall out at the top of the loop, when the speed is
(a) below a certain minimum value irrespective of amount of water in the bucket
(b) above a certain minimum value irrespective of amount of water in the bucket
(c) above a certain minimum value depending on amount of water in the bucket
(d) below a certain minimum value depending on amount of water in the bucket
26. An Athlete runs before long jump to get advantage on
(A) inertia of motion
(B) frictional force
(C) moment of a force
(D) principle of moments
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