set 14 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 : Assertion (A):
Small glass beads fixed on traffic signals glow brightly when light falls upon them.
Reason (R):
Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium.
Code

(a) (A) is true, but (R) is false

(b) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

(c) Both (A) and (R) are true and (R) is the correct explanation of (A)

(d) (A) is false, but (R) is true

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

The sun is seen before the actual sunrise because of

a) scattering of light

b) reflection

c) refraction

d) rectilinear propagation of light

Answer: (c)

Question : 2

At 0°C a body emits

a) only microwave radiation

b) no radiation

c) only visible light

d) all wavelengths.

Answer: (d)

At any temperature other than zero K, each body emits all wavelengths.

Question : 3

Blue colour of the sky is due to

a) Interference of light

b) Dispersion of light

c) Scattering of light

d) Emission of more blue light as compared to other colours by the Sun

Answer: (c)

Question : 4

Good absorbers of heat are

a) good emitters

b) poor emitters

c) non-emitters

d) highly polished

Answer: (a)

Good absorbers are always good emitters of heat.

Question : 5

In television broadcast, the picture signals are transmitted by

a) Frequency modulation

b) Phase modulation

c) Amplitude modulation

d) Angle modulation

Answer: (c)

Question : 6

When light waves pass from air to glass the variable affected are

a) Wavelength and frequency

b) Velocity and frequency

c) Wavelength, frequency and velocity

d) Wavelength and velocity

Answer: (d)

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