set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

The Earth travels in its orbit at a speed of approx. 4,400 km per hour. Why do we not feel this high speed?

a) Our relative speed with respect to the Earth along the Earth’s orbit is zero

b) Because we are too small compared to the size of the Earth

c) The solar system as a whole is also moving

d) The gravity of the Earth constantly pulls us towards the Earth’s centre

Question : 2

The acceleration due to gravity of a destructive Earthquake will be

a) >750 cm/$s^2$

b) >550 cm/$s^2$

c) >950 cm/$s^2$

d) >980 cm/$s^2$

Question : 3

The two balls of iron and wood of same weight dropped from the same height, then

a) One falls first, another falls later

b) They reach the ground (Earth) at the same time

c) The wooden ball falls later

d) They reach the ground after some gap

Question : 4

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 : 5

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 : 6

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