set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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 : 3

Earth’s escape velocity is

a) 21.1 km/s

b) 15.0 km/s

c) 7.0 km/s

d) 11.2 km/s

Question : 4

If the distance between the Earth and the Sun were twice what it is now, the gravitational force exerted on the Earth by the Sun would be

a) Four times as large as it is now

b) Twice as large as it is now

c) One-fourth of what it is now

d) Half of what it is now

Question : 5

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 : 6

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