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Sound

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

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Q76. A biological method that uses ultrasonic sound?

  1. ASonography
  2. BECG
  3. CEEG.
  4. DX-ray
Show answer & explanation

Answer: A) Sonography

Q77. Which waves cannot propagate in vacuum?

  1. ALight
  2. Belectromagnetic
  3. Csound
  4. Dheat
Show answer & explanation

Answer: C) sound

Q78. If Va, Vw and Vs are the velocity of sound in air, water and steel respectively, then-

  1. AVa < Vw < Vs.
  2. BVs < Vw < Va
  3. CVw < Vs < Va
  4. DVs < Vw < Va
Show answer & explanation

Answer: A) Va < Vw < Vs.

Q79. In which medium sound waves cannot travel?

  1. Asolid medium
  2. Bliquid medium
  3. Cgaseous medium
  4. Dvacuum
Show answer & explanation

Answer: D) vacuum

Q80. What is the instrument called which is used for identification and alignment of sound waves?

  1. Aradar
  2. BSonar
  3. CPucker
  4. DNone of these
Show answer & explanation

Answer: B) Sonar

Q81. Ultrasonic waves compared to audible sound waves-

  1. Ahave higher speeds
  2. Bhave higher frequency
  3. Chave longer wavelengths
  4. Dhave both higher speed and higher frequency
Show answer & explanation

Answer: B) have higher frequency

Q82. Echo sounding is used in-

  1. Ato produce vibrations in sound
  2. Bto increase the frequency of sound
  3. Cto measure the depth of the sea
  4. Dnone of the above
Show answer & explanation

Answer: C) to measure the depth of the sea

Q83. Acoustic is the science of-

  1. Arelated to light
  2. Brelated to sound
  3. Cclimate-related
  4. Dmetal-related
Show answer & explanation

Answer: B) related to sound

Q84. The standard sound level for humans is-

  1. A90dB
  2. B60dB
  3. C120 dR
  4. D100 aB
Show answer & explanation

Answer: B) 60dB

Q85. The instrument used to detect submerged objects is called-

  1. Aradar
  2. BSonar
  3. CKyasar
  4. DPulsator
Show answer & explanation

Answer: B) Sonar

Q86. On hearing thunder, a person opens his mouth so that-

  1. Acan dispel fear
  2. BTo equalize the air pressure on the eardrums of both ears
  3. CTo equalize the air pressure on the eardrums of both ears
  4. Dto expel air through the mouth
Show answer & explanation

Answer: B) To equalize the air pressure on the eardrums of both ears

Q87. Which of the following properties of sound is affected by change in air temperature?

  1. Awavelength
  2. BExpansion
  3. Cfrequency
  4. Dintensity
Show answer & explanation

Answer: C) frequency

Q88. The property of sound waves which determines the pitch of the sound is the sound's/ki-

  1. Afrequency
  2. BDimensions
  3. Cwavelength
  4. Dintensity
Show answer & explanation

Answer: A) frequency

Q89. Which one of the following statements is not correct about sound?

  1. Asound travels slower than the speed of light
  2. BSound travels faster in humid air than in dry air
  3. Csound waves are longitudinal waves
  4. Dsound waves are longitudinal waves
Show answer & explanation

Answer: C) sound waves are longitudinal waves

Q90. Which of the following statements regarding the propagation of sound waves is not correct?

  1. ASound waves can travel through water.
  2. BSound waves can travel through air.
  3. Csound waves can travel through steel
  4. Dsound waves can travel through vacuum
Show answer & explanation

Answer: D) sound waves can travel through vacuum

Q91. What is the approximate speed of boiling in distilled water at 25°C (77°F)?

  1. A1284 m/s
  2. B3980 m/s
  3. C1598 m/s
  4. D1498 m/s.
Show answer & explanation

Answer: D) 1498 m/s.

Q92. The property of sound waves that determines its pitch is the sound's/ki-

  1. Afrequency
  2. BDimensions
  3. Cwavelength
  4. Dintensity
Show answer & explanation

Answer: A) frequency

Q93. What is the phenomenon called when sound created in a large hall persists due to repeated reflections?

  1. Areverberation
  2. Bdeflection
  3. CRefraction
  4. DDiffraction
Show answer & explanation

Answer: A) reverberation

Q94. Which of the following cannot be the unit of frequency of a sound wave?

  1. AdB
  2. Bs-1
  3. CHz
  4. Dmin-¹
Show answer & explanation

Answer: A) dB

Q95. Beats is a phenomenon that occurs when the frequencies of two harmonic waves are-

  1. Abe equal
  2. Bthere is a considerable difference in
  3. Cbe multiples of each other
  4. Dbe approximately the same
Show answer & explanation

Answer: D) be approximately the same

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