set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

At what point the Fahrenheit temperature is double of Centigrade temperature?

a) – 12.3°C

b) 12.3°C

c) – 6.7°C

d) 160°C

Question : 2

Food gets cooked faster in a pressure cooker because

a) Water starts boiling at a higher temperature due to high pressure

b) Water boils only at 100ºC but the heat content is higher at high pressure

c) Water starts boiling at a lower temperature due to high pressure

d) Convection currents are set inside the cooker

Question : 3

Consider the figures of a metal ball and a metal ring given below. The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated

a) The ball gets stuck because of the diameter of the hole decrease on expansion

b) The ball will still pass through because the hole diameter does not change

c) The ball can still pass through the ring as diameter expands on heating

d) The ball will pass through because there is no change in the ring

Question : 4

In a sitar wire which one of the following types of vibration is produced?

a) Stationary longitudinal

b) Progressive longitudinal

c) Progressive transverse

d) Stationary transverse

Question : 5

The sound travels fastest in

a) liquids

b) solids

c) gases

d) none of these

Question : 6

Diffusion of light in the atmosphere takes place due to

a) Helium

b) Dust particles

c) Carbon dioxide

d) Water vapours