Physics General Knowledge Questions and Answers - 3

Question: 11

Cooling is not done by

(A) Melting the solid

(B) Burning cooking gas

(C) Release of compressed gas

(D) Flow of water

Question: 12

The working principle of a washing machine is

(A) Diffusion

(B) Reverse osmosis

(C) Dialysis

(D) Centrifugation

Question: 13

Why are the inner lining of hot water made up of copper?

(A) Copper has less heat capacity

(B) Copper has high electrical conductivity

(C) Copper does not react with steam

(D) Copper is good conductor of both heat and electricity

Question: 14

The focal length of convex lens is

(A) shorter for blue light than for red

(B) shorter for red light than for blue

(C) maximum for yellow light

(D) the same for all the colours

Question: 15

Recently developed technique for monitoring foetal growth is

(A) Ultrasonic

(B) Ultra–violet rays

(C) Microwave technique

(D) X–rays