Exercise 2

Question 11 :

Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?

A). Rainbow
B). Earthshine
C). Halo
D). Mirage
Answer : Option D

Question 12 :

Inside an aeroplane, flying at a high altitude,

A). the pressure is the same as that outside
B). normal atmospheric pressure is maintained by the use of air pumps
C). the pressure inside is less than the pressure outside
D). normal humidity and partial vacuum are maintained
Answer : Option B

Question 13 :

Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

A). Water, iron and air
B). Iron, air and water
C). Air, water and iron
D). Iron, water and air
Answer : Option C

Question 14 :

One thousand microns is equal to

A). 10-3m
B). 10-6m
C). 10-9m
D). 10-12m
Answer : Option A

Question 15 :

Sound travels at the fastest speed in

A). steel
B). water
C). air
D). vacuum
Answer : Option A