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 : 21

If a car is moving towards you with its horn sounding, you hear a higher pitch than you would hear if the car were at rest. This is because:

a) you receive successive crests more frequently even though the wave itself is unchanged

b) the waves travel faster

c) successive crests produced by the horn are closer to each other

d) the motion of the car raises the frequency of the horn

Discuss »

Answer: (a)

When the car is at rest, the observer receives its original frequency $‘v’$.

But when the car is moving towards the stationary observer then the apparent frequency of sound is 

$v' = v (v/{v-v_s})$

where vs is the velocity of the source. Hence, the observer receives successive crests more frequently even though the wave itself is unchanged.

Question : 22

Consider the following statements : If the same note is played on a flute and a sitar, one can still distinguish between them because they differ in

  1. frequency
  2. intensity
  3. quality
Which of the statements given above is/are correct?

a) 3 only

b) 1 only

c) 2 and 3

d) 2 only

Discuss »

Answer: (a)

The difference in music from both the instruments is due to quality difference.

Question : 23 [IAS (Pre) 2001]

Assertion (A):
The boiling point of water decreases as the altitude increases.
Reason (R):
The atmospheric pressure increases with altitude.
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

Discuss »

Answer: (b)

Question : 24

The acronym for LASER is

a) Low Amplitude Short Energy Radiation

b) Light Amplification by Stimulated Emission of Radiation

c) Low Amplitude Stimulated Emission of Radiation

d) Light Amplification by Short Energy Radiation

Discuss »

Answer: (b)

Question : 25 [UP (Pre) 1998]

Which of the following atmospheric layers is responsible for the deflection of radio waves?

a) Mesosphere

b) Stratosphere

c) Troposphere

d) Ionosphere

Discuss »

Answer: (d)

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