set 4 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 : Consider telecommunication through optical fibres. Which of the following statement is not true?

(a) Optical fibres are subject to electromagnetic interference from outside

(b) Optical fibres can be of graded refractive index

(c) Optical fibres have extremely low transmission loss

(d) Optical fibres may have homogeneous core with a suitable cladding

The correct answers to the above question in:

Answer: (a)

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

Question : 1

Consider the following statements.

  1. The heart vibrates at infrasonic.
  2. The speed of sound is more in gas than in liquid and solid.
  3. Mach number is used to describe the speed of sound.
  4. Ultrasonic sound has frequency more than 20,000 Hz.
Of these statements.

a) 2, 3 and 4 are correct

b) 1, 3 and 4 are correct

c) 1, 2 and 3 are correct

d) 1, 2 and 4 are correct

Answer: (b)

Question : 2

A periodic wave is produced on a stretched string. Note the following quantities associated with the wave and the string

  1. frequency
  2. tension in the string
  3. wavelength
  4. linear density of the string
Which of the quantities influences the speed of the waves?

a) 1 and 2

b) 1 only

c) 3 and 4

d) 1, 2, 3 and 4

Answer: (b)

Sound waves cannot travel is vacuum.

Question : 3

Consider the following statements : Sound waves can undergo

  1. reflection
  2. refraction
  3. interference

a) 2 and 3 only

b) 1 and 2 only

c) 1 and 3 only

d) 1, 2 and 3

Answer: (d)

Question : 4

The body temperature of a healthy man is

a) 37° Fahrenheit

b) 98.4° Celsius

c) 37° Celsius

d) 98.4° Kelvin

Answer: (c)

Question : 5

When water is heated from 0ºC to 10ºC. It’s volume

a) Decreases

b) Does not change

c) Increases

d) First decreases and then increases

Answer: (d)

Question : 6

The velocity of sound in any gas depends upon

a) intensity of sound waves only

b) wavelength of sound only

c) density and elasticity of gas

d) amplitude and frequency of sound

Answer: (c)

Velocity of sound in any gas depends upon density and elasticity of gas.

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