mechanics (mass, force, acceleration, work, energy, momentum, velocity) - Category wise Question and Answer Practice Test with Solutions

Question : 31

In an explosion, a body breaks up into two pieces of unequal masses. In this

a) heavier part will have more momentum

b) lighter part will have more momentum

c) both parts will have numerically equal momentum

d) both parts will have equal kinetic energy

Question : 32

If the earth rotates faster than its present speed, the weight of an object will

a) remain unchaged at the equator but decrease at the poles

b) decrease at the equator but remain unchanged at the poles

c) increase at the equator but remain unchaged at the poles

d) remain unchanged at the equator but increase at the poles

Question : 33

Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is

a) v/2

b) v/3

c) v

d) zero

Question : 34 [IAS (Pre) 1996]

A person is sitting in a car which is at rest. The reaction from the road at each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at either of the front wheels vary?

a) It will be equal to R

b) It will be less than R

c) It will be greater than R

d) It shall depend on the material of the road

Question : 35

The wide handle of screw is based upon

a) turning moment of force

b) law of conservation of linear momentum

c) Newton’s second law of motion

d) None of these