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PHYSICS MCQs

Total Questions : 3767 | Page 68 of 377 pages
Question 671. Which one among the following doesn't have any effect on velocity of sound ?
  1.    Pressure
  2.    Temperature
  3.    Humidity
  4.    Density
 Discuss Question
Answer: Option C. -> Humidity
Question 672. Velocity of sound in air does not change with the change of
  1.    Temperature of air
  2.    Pressure of air
  3.    Moisture content in air
  4.    Wind in the direction of propagation of sound
 Discuss Question
Answer: Option B. -> Pressure of air
Question 673. The propagation of sound waves in a gas involves
  1.    Adiabatic compression and rarefaction
  2.    Isothermal compression and rarefaction
  3.    Isochoric compression and rarefaction
  4.    Isobaric compression and rarefaction
 Discuss Question
Answer: Option A. -> Adiabatic compression and rarefaction
Question 674. When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as
  1.    Doppler effect
  2.    Beats
  3.    Resonance
  4.    Echo
 Discuss Question
Answer: Option B. -> Beats
Question 675. Propagation of sound can be visualised as propagation of ________ variations in the medium
  1.    Elasticity
  2.    Viscosity
  3.    Density
  4.    Porosity
 Discuss Question
Answer: Option C. -> Density
Question 676. Permissible noise level at Residential area during night time is :
  1.    45 dB (A)
  2.    55 dB (A)
  3.    75 dB (A)
  4.    80 dB (A)
 Discuss Question
Answer: Option A. -> 45 dB (A)
Question 677. Which waves cannot be transmitted through vacuum?
  1.    Electromagnetic
  2.    Light
  3.    Sound
  4.    Heat
 Discuss Question
Answer: Option C. -> Sound
Question 678. Submerged objects can be located using
  1.    Radar
  2.    Sonar
  3.    Quasar
  4.    Pulsar
 Discuss Question
Answer: Option B. -> Sonar
Question 679. Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s
  1.    2000
  2.    0.016
  3.    1000
  4.    0.008
 Discuss Question
Answer: Option D. -> 0.008
Question 680. The velocity of sound is more in
  1.    Water
  2.    Air
  3.    Steel
  4.    Wood
 Discuss Question
Answer: Option C. -> Steel

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