set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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

Question : 2

The variation of displacement d with time t in the case of a particle falling freely under gravity from rest is correctly shown in the graph.

a)

b)

c)

d)

Question : 3

The Leaning Tower of Pisa does not fall because

a) It covers a large base area

b) It is tapered at the top

c) Its centre of gravity remains at the lowest position

d) The vertical line through the centre of gravity of the tower falls within its base

Question : 4

A pendulum clock can run faster in

a) Winter

b) Summer

c) Spring season

d) Rainy season