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]

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Question : 26

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 : 27 [NDA]

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 : 28 [PSC (Pre) 2015]

Assertion (A):
The danger signal is made up of red colour.
Reason (R):
Red colour is scattered the least.
Select the correct answer using the codes given below.

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

Answer: (c)

Question : 29 [IAS (Pre) 1994]

The colour of an opaque object is due to the colour it

a) Reflects

b) Refracts

c) Absorbs

d) Scatters

Answer: (a)

Question : 30

Which of the following statements is/are correct about sound?

  1. Sound is produced by a vibrating body.
  2. Sound needs a medium for propagation.
  3. If 2 sounds are equally loud, then their pitch will also be equal.

a) 1, 2 and 3

b) 1 and 3

c) 3 only

d) 1 and 2

Answer: (d)

Pitch of sound depends on vibration of source.

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