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Sound

95 MCQ questions with answers and explanations · page 3 of 4

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Q51. What causes sound waves to produce echoes?

  1. ARefraction
  2. BDiffraction
  3. Creflection
  4. DNone of these
Show answer & explanation

Answer: C) reflection

Q52. How far should a person stand from the reflecting surface to hear his echo?

  1. A224 feet
  2. B56 feet
  3. C28 feet
  4. D100 feet
Show answer & explanation

Answer: B) 56 feet

Q53. On which principle of sound does the stethoscope work?

  1. Areflection
  2. BRefraction
  3. CDiffraction
  4. Dpolarization
Show answer & explanation

Answer: A) reflection

Q54. Echo is produced due to the _______ of waves.

  1. ARefraction
  2. BAbsorption
  3. Creflection
  4. DDiffraction
Show answer & explanation

Answer: C) reflection

Q55. Sonar is mostly used in-

  1. Aby astronauts
  2. Bby doctors
  3. Cby engineers
  4. Dby navigators
Show answer & explanation

Answer: D) by navigators

Q56. The relationship between the reverberation time and the volume of the hall has been formulated by-

  1. AThe dollar
  2. BNewton
  3. CMavin
  4. DLaplace
Show answer & explanation

Answer: C) Mavin

Q57. The reverberation time of Dead Hall is-

  1. A0.8 seconds
  2. B0.8 seconds
  3. C1.8 seconds
  4. D8 seconds
Show answer & explanation

Answer: A) 0.8 seconds

Q58. When the army crosses a bridge, the soldiers are instructed not to march in step because-

  1. AThere is a risk of the bridge collapsing due to increased pressure.
  2. BThere is a danger of the bridge breaking due to resonance of the sound produced by the feet
  3. CThere is a danger of bridge collapse due to Dander effect.
  4. Dnone of these
Show answer & explanation

Answer: B) There is a danger of the bridge breaking due to resonance of the sound produced by the feet

Q59. We listen to programs from different stations by turning the radio knob. This is possible through:

  1. Adue to resonance
  2. Bdue to beat
  3. Cdue to interference
  4. DCauses of diffraction
Show answer & explanation

Answer: A) due to resonance

Q60. It is said that when Tansen sang, window panes or glass glasses would shatter into pieces. If this were even possible, what property of sound would cause it?

  1. Areflection
  2. BRefraction
  3. Cresonance
  4. Dinterference
Show answer & explanation

Answer: C) resonance

Q61. When we place a pitcher under water to fill it, we hear a distinctive sound as it fills. This is because:

  1. ARefraction
  2. Binterference
  3. Cresonance
  4. Dreflection
Show answer & explanation

Answer: C) resonance

Q62. Radio tuning station is an example of

  1. Areflection
  2. Bresonance
  3. Creflection
  4. DRefraction
Show answer & explanation

Answer: B) resonance

Q63. When two loudspeakers are used simultaneously at a place, a listener sitting at a particular place cannot hear their sound. This is because:

  1. Areflection
  2. Binterference
  3. CRefraction
  4. Dresonance
Show answer & explanation

Answer: B) interference

Q64. Ships enter silence zones, where the sound of sirens is inaudible. These silent zones are created by what property of sound waves?

  1. Areflection
  2. Binterference
  3. CRefraction
  4. Dresonance
Show answer & explanation

Answer: B) interference

Q65. When we sit inside a room, we may not see the people talking in the adjacent room, but we can certainly hear their voices. This is because of sound—

  1. Areflection
  2. BRefraction
  3. Cinterference
  4. DDiffraction
Show answer & explanation

Answer: D) Diffraction

Q66. The fluctuations in the frequency of a sound source are called-

  1. ARaman effect
  2. BDoppler effect
  3. CCrampton effect
  4. Dphotoelectric effect
Show answer & explanation

Answer: B) Doppler effect

Q67. Doppler effect is related to-

  1. Asound
  2. Bpopulation
  3. CPsychology
  4. Dcurrency circulation
Show answer & explanation

Answer: A) sound

Q68. The frequency or sharpness of the whistle of an approaching train increases, due to which phenomenon does this happen?

  1. ABig Bang Theory
  2. BDoppler effect
  3. CArchimedes' law
  4. DCharles's Law
Show answer & explanation

Answer: B) Doppler effect

Q69. The velocity of sound in moist air is greater than that in dry air because in moist air-

  1. Ahas a higher density than dry air
  2. Bhas a lower density than dry air
  3. CThe pressure is higher than that of dry air
  4. DLower pressure than dry air
Show answer & explanation

Answer: B) has a lower density than dry air

Q70. Which of the following statements is correct? Velocity of sound-

  1. ADoes not depend on the nature of the medium
  2. BIt is maximum in gases and minimum in liquids
  3. CIt is maximum in solids and minimum in liquids
  4. DIt is maximum in solids and minimum in gases
Show answer & explanation

Answer: D) It is maximum in solids and minimum in gases

Q71. Which one of the following statements is not correct?

  1. ASound waves in gases are longitudinal in nature.
  2. BSound waves with a frequency less than 20 Hz are called ultrasonic waves.
  3. CSound waves with higher amplitudes are louder
  4. DSound waves with high audible frequencies are sharp.
Show answer & explanation

Answer: B) Sound waves with a frequency less than 20 Hz are called ultrasonic waves.

Q72. Which one of the following types of waves is used in night vision devices?

  1. Aradio waves
  2. Bmicrowave
  3. Cinfrared wave
  4. DNone of these
Show answer & explanation

Answer: C) infrared wave

Q73. In which one of the following is the attention speed the highest?

  1. Ain air at 0°C
  2. Bin air at 100°C
  3. Cin water
  4. Din wood
Show answer & explanation

Answer: D) in wood

Q74. A jet aircraft is flying through the air at Mach 2. What is the speed of the aircraft when the speed of sound is 332 m/s?

  1. A166m/s
  2. B66.4m/s
  3. C332m/s
  4. D664m/s
Show answer & explanation

Answer: D) 664m/s

Q75. In which medium will the speed of sound be maximum at a temperature of about 20°C?

  1. AAir
  2. BGranite
  3. CWater
  4. DIron
Show answer & explanation

Answer: D) Iron

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