set 11 MCQ Questions & Answers Detailed Explanation

Question : 1

Assertion (A):
With the increase of temperature, the viscosity of glycerin increases.
Reason (R):
Rise of temperature increases kinetic energy of molecules.
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

Question : 2

Xeric condition refers to

a) low humidity

b) high evaporation

c) low temperature

d) extreme temperature

Question : 3

A sound wave having certain frequency is incident on air-water surface. A part of it is reflected and other part is refracted into water. Then:

a) the frequency of reflected wave will be more than frequency of refracted wave

b) the reflected wave will travel faster than refracted wave

c) the wavelength of refracted wave will be more than wavelength of reflected wave

d) the frequency, wavelength and velocity of reflected and refracted waves will be same as that of incident wave

Question : 4

Assertion (A):
A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter the copper piece appears hotter than the glass piece.
Reason (R):
The desity of copper is more than that of glass.
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