set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

Time period of a simple pendulum inside a satellite orbiting earth is

a) T

b) ∞

c) zero

d) 2 T

Question : 2

ML²T ^–2 are dimensions of

a) momentum

b) moment of force

c) force

d) power

Question : 3

For a given mass and size, moment of inertia of a solid disc is

a) equal to that of a ring

b) less than that of a ring

c) more than that of a ring

d) depend on the material of ring and disc

Question : 4

Two persons do the same amount of work, one in 10 s and the other in 20 s. Find the ratio of the power used by the first person to that by the second person.

a) 5 : 2

b) 2 : 1

c) 6 : 4

d) 4 : 3

Question : 5

A rubber ball dropped from 24 m height loses its kinetic energy by 25%. What is the height to which it rebounds.

a) 18 m

b) 12 m

c) 6 m

d) 24 m

Question : 6

A body weighs less at the equator than at the poles because:

1. earth rotates about its axis.
2. the ice cap at the poles increases gravitational pull.
3. equatorial diameter is greater than the polar diameter.
4. of some unknown facts.

a) 1 and 3

b) 1 and 2

c) 3 only

d) 4 only