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 : Which is not a primary colour?

(a) Red

(b) Yellow

(c) Black

(d) Blue

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 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 : 2

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

a) 100 dB

b) 80 dB

c) 30 dB

d) 120 dB

Answer: (b)

Question : 3

Waves used for telecommunication are

a) Ultraviolet

b) Infrared

c) Visible light

d) Microwave

Answer: (d)

Question : 4

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)

Question : 5

Consider the following statements.

  1. Light of longer wavelength is scattered much more than the light of shorter wavelength.
  2. The speed of visible light in water is 0.95 times the speed in vacuum.
  3. Radio waves are produced by rapidly oscillating electrical currents.
  4. To detect the overspeeding vehicles, police use the Doppler effect of reflected short radio waves.
Which of these statements are correct?

a) 2 and 4

b) 1 and 3

c) 1 and 2

d) 3 and 4

Answer: (d)

Question : 6

Assertion (A):
Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
Reason (R):
Ammonia can be liquefied at ambient temperatures at low pressures.
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

Answer: (b)

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