set 2 MCQ Questions & Answers Detailed Explanation

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : Cloudy nights are warmer compared to clear cloudless nights, because clouds

(a) produce heat and radiate it towards earth

(b) reflect back the heat given off by earth

(c) prevent clod waves from the sky from descending on earth

(d) absorb heat from the atmosphere and send it towards earth

The correct answers to the above question in:

Answer: (b)

Cloudy nights are warmer than clear nights because, the cloud cover provides a shield which act as an insulator and store up the heat radiated by the earth and do not permit heat to escape.

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

The reason of mirage is

a) Polarization of light

b) Diffraction of light

c) Interference of light

d) Total internal reflection of light

Answer: (d)

Question : 2

A ray of light propagates from an optically denser medium to an optically rarer medium. Then

a) it will continue to go on the same path after refraction.

b) it will bend towards the normal after refraction.

c) it will bend away from the normal after refraction.

d) it will refract making an angle of refraction = angle of incidence.

Answer: (d)

A ray of light traveling from optically denser to the optically rarer medium will bend away from the normal.

Question : 3

In an Earthen pitcher, the water remains cold due to the process of

a) Evaporation

b) Sublimation

c) Condensation

d) None of the above

Answer: (a)

Question : 4

Ultrasonic waves have frequency

a) only above 20,000 Hz

b) below 20 Hz

c) between 20 and 20,000 Hz

d) only above 20,000 MHz

Answer: (a)

Question : 5

Which one of the following types of waves are used in a Night Vision apparatus?

a) Infra-red waves

b) Micro waves

c) Radio waves

d) None of the above

Answer: (a)

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