light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 1 [IAS (Pre) 1993]

Consider the figures of a metal ball and a metal ring given below. The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated

Thermodynamics mcq question answer 24

a) The ball gets stuck because of the diameter of the hole decrease on expansion

b) The ball will still pass through because the hole diameter does not change

c) The ball can still pass through the ring as diameter expands on heating

d) The ball will pass through because there is no change in the ring

Answer: (c)

Question : 2

Some common mediums in which the speed of sound waves is measured are mentioned below?

  1. Air
  2. Steel
  3. Copper
  4. Water
What is the correct increasing order of the speed of sound?

a) 1 < 4 < 3 < 2

b) 1 < 4 < 2 < 3

c) 4 < 1 < 2 < 3

d) 4 < 1 < 3 < 2

Answer: (a)

The speed of sound is maximum in solids

Vsolid > Vliquid > Vgas.

Steel is more elastic than copper, hence the speed of sound is greater in steel than in copper.

Question : 3 [UP UDA/LDA (Pre) 2010]

Optical fibre works on the principle of

a) Scattering

b) Refraction

c) Total internal reflection

d) Interference

Answer: (c)

Question : 4

Which of the following statements is correct ?

a) Frequency of ultrasonic waves is of the same order as that of X-rays

b) Ultrasonic waves can travel in vacuum

c) Wavelength of ultrasonic waves is of the same order as that of microwaves

d) Speed of ultrasonic waves is of the same order as that of light

Answer: (a)

Question : 5

What is the effect of humidity on sound waves when humidity increases?

a) Speed of sound waves remains same

b) Speed of sound waves is more

c) Speed of sound waves is less

d) Speed of sound waves becomes zero

Answer: (b)

The velocity of sound = $√{γRT}/M$

When water vapour is present in air average molecular weight of air decreases and hence velocity increases.

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