set 15 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):
A jet aircraft moving at mach number equal to 1 travels faster at an altitude of 15 km than while moving at mach number equal to 1 near the sea level.
Reason (R):
The velocity of sound depends on the temperature of the surrounding medium.
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

The correct answers to the above question in:

Answer: (d)

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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 colours has the longest wavelength?

a) Blue

b) Yellow

c) Green

d) Red

Answer: (d)

Question : 2

A well cut diamond appears bright because

a) of the total internal reflection

b) of reflection of light

c) of dispersion of light

d) of refraction of light

Answer: (a)

Question : 3

Long radio waves are reflected by which of the following layer of Earth’s surface?

a) Tropopause

b) Ionosphere

c) Troposphere

d) Stratosphere

Answer: (b)

Question : 4

In the night wind blows fast, dew is not formed because

a) Moisture in air is low

b) Temperature is high

c) Rate of evaporation is fast

d) Sky is not clear

Answer: (c)

Question : 5

The technique used to transmit auto signals in television broadcasts is

a) Pulse Code Modulation

b) Frequency Modulation

c) Amplitude Modulation

d) Time Division Multiplexing

Answer: (b)

Question : 6

In scattering of light phenomenon, light falls on tiny particles absorbed by these tiny particles. Then these particles re-emit light in all directions.

  1. Intensity of scattered light, $I ∝ 1/λ^4$
  2. Greenish-blue appearance of sea water is due to scattering of light
  3. In a clear atmosphere of the earth, red colour scatters more than blue colour.
Which of the above statement(s) is /are true?

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Answer: (d)

The wavelength of the red colour is more than the blue colour. According to Reybergh's scattering formula scattering ∝ $1/4$

Thus, the light of short waves is scattered about ten times as the longer waves of red light.

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