set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

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

Question : 2

Which one of the following statements regarding artificial satellite of the earth is incorrect ?

a) The period of revolution is large if the radius of its orbit is large

b) A minimum velocity of 8 km/sec is required by a satellite to orbit quite close to the earth

c) The orbital velocity depends on the mass of the satelllite

d) The height of a geostationary satellite is about 36000 km from earth

Question : 3

A hole is drilled through the earth along the diameter and a stone is dropped into it. When the stone is at the centre of earth, it possesses

a) acceleration

b) mass

c) weight

d) potential energy

Question : 4

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 : 5

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 : 6

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