set 3 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 : It is more comfortable to wear white cloth in summer because

(a) They radiate heat transferred from the body

(b) They absorb perspiration

(c) They reflect all the heat falling on them

(d) They are soothing to the eye

The correct answers to the above question in:

Answer: (c)

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

Question : 1

Which of the following is not close to a black body?

a) Black holes

b) Black board paint

c) Green leaves

d) Red roses

Answer: (b)

Question : 2

When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of

a) polarization of light

b) dispersion of light

c) reflection of light

d) interference of light

Answer: (d)

The colours are seen due to interference of light. The colours seen in reflected light are complementary with the colours seen in transmitted light.

Question : 3

Ultrasonics are sound waves of frequency

a) Less than 10,000 Hz

b) Equal to 1000 Hz

c) Greater than 20,000 Hz

d) None of the above

Answer: (c)

Question : 4

Range of audio-frequencies is

a) 103 – 105 Hz

b) 1 –15 Hz

c) 20 – 20, 000 Hz

d) 106 – 108 Hz

Answer: (c)

Question : 5

If you are at open-air concert and someone’s head gets between you and the orchestra, you can still hear the orchestra because

a) the sound is reflected from the head

b) sound waves pass easily through a head

c) a head is not very large compared with the wavelength of the sound

d) the wavelength of the sound is much smaller than the head

Answer: (c)

Question : 6

Waves used for telecommunication are

a) Ultraviolet

b) Infrared

c) Visible light

d) Microwave

Answer: (d)

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