set 7 MCQ Questions & Answers Detailed Explanation

Question : 1

When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in

a) pitch and loudness

b) quality only

c) pitch, loudness and quality

d) loudness only

Question : 2

Assertion (A):
In a pressure cooker food is cooked above boiling point.
Reason (R):
Boiling point of water increases as the pressure increases.

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

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

c) A is true, but R is false

d) A is false, but R is true

Question : 3

Which one of the following types of waves are used in a night vision apparatus?

a) Microwaves

b) Radio waves

c) Infra-red waves

d) None of the above

Question : 4

Expansion during heating

a) decreases the density of a material

b) occurs only in solids

c) increases the weight of a material

d) occurs at the same rate for all liquids and solids

Question : 5

‘Raman effect’ deals with the light rays passing through

a) Only diamonds

b) Only prisms

c) Only fluids

d) All transparent medium

Question : 6

In which of the following conditions wet clothes will dry earliest?

a) 100% RH, 20ºC temperature

b) 20% RH, 20ºC temperature

c) 100% RH, 60ºC temperature

d) 20% RH, 60ºC temperature