set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

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

Question : 2

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 : 3

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 : 4

Which of the following is a vector quantity?

a) Displacement

b) Speed

c) Time

d) Distance

Question : 5

No work is done when

a) there is no component of force parallel to the direction of motion

b) a box is pushed along a horizontal floor

c) a nail is plugged into a wooden board

d) there is no component of force normal to the direction of force

Question : 6

A parachutist jumps from a height of 5000 metre. The relationship between his falling speed, v and the distance fallen through d is best represented as :

a)

b)

c)

d)