set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The maximum density of water is at

a) 277 Kelvin

b) 273 Kelvin

c) 373 Kelvin

d) 269 Kelvin

Question : 2

The load verses elongation graph for four wires is shown. The thinnest wire is

a) b

b) a

c) c

d) d

Question : 3

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. Why? Following are some options

a) Since, the surface of the lake is at the same temperature as the air, no heat is lost

b) The density of water is maximum at 4°C

c) Ice is a bad conductor of heat

d) None of the above

Question : 4

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 : 5

An iron needle floats on the surface of water due to

a) Surface tension

b) Viscosity

c) Upthrust of water

d) Gravitational force

Question : 6

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