set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The density of water will reach its maximum value at the temperature of

a) 4°C

b) 50°C

c) 0°C

d) 100°C

Question : 2

An iron needle floats on the surface of water due to

a) Surface tension

b) Viscosity

c) Upthrust of water

d) Gravitational force

Question : 3

Mobiles and Automobiles have brought about a revolution in the social life of Indians, especially in the rural, in terms of

1. Mobility of the people
2. Connectivity of the people
3. Sensitivity of the people

a) Only 1 and 3

b) Only 2 and 3

c) Only 1 and 2

d) 1, 2 and 3

Question : 4

While lifting a bucket of water from a well, we feel that the bucket

a) Becomes lighter above the surface of water

b) Loses stability on coming out of the water

c) Becomes heavier above the surface of water

d) Has gained mass on coming out of water

Question : 5

Water is flowing through a horizontal pipe in streamline flow. At the narrowest part of the pipe

a) Pressure is maximum and velocity is minimum

b) Velocity is maximum and pressure is minimum

c) Both the pressure and velocity are maximum

d) Both the velocity and pressure are minimum

Question : 6

A boy carries a fish in one hand and a bucket of water in the other hand. If he places the fish in the bucket, the weight now carried by him.

a) is more than before

b) is less than before

c) is the same as before

d) depends upon his speed