set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Why does an iron nail float on mercury while it sinks in water?

a) Iron is heavier than water and lighter than mercury

b) Iron has greater density than water and lesser than mercury

c) Due to less chemical interaction of iron with mercury than it is with water

d) Mercury is heavier than water

Question : 2

The tendency of a liquid drop to contract and occupy minimum area is due to

a) Viscosity

b) Density

c) Surface tension

d) Vapour pressure

Question : 3

If the force on the surface is doubled and area is reduced to half, pressure will

a) become 3 times

b) become 2 times

c) become 4 times

d) remain unchanged

Question : 4

For a fluid which is flowing steadily, the level in the vertical tubes is best represented by

a)

b)

c)

d)

Question : 5

200 gm of water is filled in a weightless balloon. Its weight in water will be

a) 100 gm

b) 200 gm

c) Zero

d) 400 gm

Question : 6

Hydraulic lift is based on the principle of

a) Bernoulli’s theorem

b) Pascal’s law

c) Toricelli’s theorem

d) Stoke’s law