set 11 MCQ Questions & Answers Detailed Explanation

Question : 1

What is the function of the thermostat of a refrigerator?

a) To increase the freezing point

b) To maintain constant temperature

c) To lower the temperature

d) To decrease the melting point

Question : 2

A biotechnique in which ultrasonic sound is used

a) E.C.G.

b) E.E.G.

c) Sonography

d) X-ray

Question : 3

‘The stars seem to be higher on the sky than they actually are’. This can be explained by

a) total internal reflection

b) atmospheric refraction

c) dispersion of light

d) diffraction of light

Question : 4

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 : 5

Xeric condition refers to

a) low humidity

b) high evaporation

c) low temperature

d) extreme temperature

Question : 6

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