motion under gravity - Category wise Question and Answer Practice Test with Solutions

Question : 21 [UPPCS (Mains) 2012]

An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth

a) Is neutralized by the attraction of the Moon

b) Does not exist at such distance

c) Provides the necessary speed for its steady motion

d) Provides the necessary acceleration for its motion

Question : 22 [IAS (Pre) 2013]

The known forces of nature can be divided into four classes, viz., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them which one of the following statements is not correct?

a) Electromagnetism acts only on particles with an electric charge

b) Gravity is the strongest of the four

c) Weak nuclear force causes, radioactivity

d) Strong nuclear force holds protons and neutrons inside the nucleus of an atom