set 3 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 16 EXERCISES

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

Questions : Sound above what level (in decibel) is considered hazardous noise pollution?

(a) 100 dB

(b) 80 dB

(c) 30 dB

(d) 120 dB

The correct answers to the above question in:

Answer: (b)

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

Question : 1

Waves used for telecommunication are

a) Ultraviolet

b) Infrared

c) Visible light

d) Microwave

Answer: (d)

Question : 2

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 : 3

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 : 4

Which one of the following statements is not correct?

a) The velocity of sound in air is independent of pressure

b) The velocity of sound in air decreases as the humidity increases

c) The velocity of sound in air increases with the increase of temperature

d) The velocity of sound in air is not affected by the change in amplitude and frequency

Answer: (b)

Question : 5

Which is not a primary colour?

a) Red

b) Yellow

c) Black

d) Blue

Answer: (c)

Question : 6

The Sun and the Moon appear elliptical near the horizon because of

a) Interference phenomenon

b) Optical illusion

c) Refraction

d) Their actual shape

Answer: (c)

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