set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected ?

a) Moment of inertia

b) Angular momentum

c) Angular velocity

d) Rotational kinetic energy

Question : 2

Light year is

a) the distance travelled by light in free space in one year.

b) time taken by light to travel from sun to earth.

c) light emitted by the sun in one year.

d) time taken by earth to go once around the sun.

Question : 3

The numerical ratio of average velocity to average speed is

a) always more than one

b) always equal to one

c) always less than one

d) equal to or less than one

Question : 4

Swimming is possible on account of

a) third law of motion

b) second law of motion

c) first law of motion

d) Newton’s law of gravitation

Question : 5

Which of the following is not a vector quantity?

a) Force

b) Velocity

c) Displacement

d) Volume

Question : 6

Two masses m and 9 m are moving with equal kinetic energies. The ratio of the magnitudes of their momenta is

a) 3 : 1

b) 1 : 3

c) 1 : 1

d) 1 : 9