physical properties of materials - Category wise Question and Answer Practice Test with Solutions

Question : 36

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

a) Length = 100 cm, diameter = 1 mm

b) Length = 50 cm , diameter = 0.5 mm

c) Length = 200 cm, diameter = 2 mm

d) Length = 300 cm, diameter = 3 mm

Question : 37 [RAS/RTS (Pre) 1992]

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 : 38 [UPPCS (Mains) 2012]

An iron needle floats on the surface of water due to

a) Surface tension

b) Viscosity

c) Upthrust of water

d) Gravitational force

Question : 39 [PSC (Pre) 2015]

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 : 40 [IAS (Pre) 2002]

Assertion (A):
An iron ball floats on mercury but gets immersed in water.
Reason (R):
The specific gravity of iron is more than that of mercury.
Code

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true