set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

If an object is falling from above, its weight remains

a) Same

b) Zero

c) Change

d) None of these

Question : 2

Astronauts in space cannot stand erect. This is because, in space

a) Viscous forces of the atmosphere are very strong

b) There is no gravity

c) Solar wind exert an upward force

d) Atmospheric pressure is very low

Question : 3

Who gave the theory of gravity?

a) Charles Babbage

b) Charles Newton

c) Isaac Newton

d) John Adams

Question : 4

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 : 5

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 : 6

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