set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Why do pendulum checks usually lose time in summer?

a) Due to friction caused by coils

b) Due to longer days in summer

c) The length of the pendulum increases, increasing the time period of unit oscillation

d) The weight of the pendulum change in summer

Question : 2

Two balls A and B are of 10 kg and 1 kg, respectively. They are dropped simultaneously from a height of 20 m. Which of the following is correct?

a) B will reach the ground first

b) A will reach the ground first

c) Both A and B will reach the ground at the same time

d) None of the above

Question : 3

If the gravitational force of the Earth suddenly disappears, which are of the following will be the correct consequence?

a) The mass of the object will become zero but the weight will remain the same

b) The weight of an object will become zero but the mass will remain the same

c) Both the mass and the weight of the object will become zero

d) The mass of the object will increase

Question : 4

If a person sitting in a lift, then when will he feel that his weight gets increased?

a) When the elevator going down expeditiously

b) When the elevator going upward expeditiously

c) Going upward with constant velocity

d) Going downward with constant velocity

Question : 5

Satellite is kept moving in its orbit around the Earth; it is due to

a) Centripetal force

b) Centrifugal force

c) Gravitational force or lack of it

d) Some other forces

Question : 6

A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because

a) Velocity is proportional to the force exerted on the ball

b) The batsman did not hit the ball hard enough

c) There is a force on the ball opposing the motion

d) There is no unbalanced force on the ball, so the ball would try to come to rest