Question 1.
The hydraulic brakes used in automobiles is a direct application of :
A. Archimedes’ principle
B. Toricellian law
C. Bernoulli’s theorem
D. Pascal’s law
Ans: D. Pascal’s law
Question 2.
The velocity of sound in moist air is more than in dry air because the moist air has
A. Less density than dry air.
B. Less pressure than dry air.
C. More pressure than dry air.
D. More density than dry air.
Ans: A. Less density than dry air.
Question 3.
Propagation of sound can be visualised as propagation of __ variations in the medium
A. Elasticity
B. Viscosity
C. Density
D. Porosity
Ans: C. Density
Question 4.
The velocity of sound is more in
A. Water
B. Air
C. Steel
D. Wood
Ans: C. Steel
Question 5.
If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is
A. Height of the liquid column
B. Surface area of the bottom of the vessel
C. Density of the liquid
D. Acceleration due to gravity at the bottom of the vessel
Ans: B. Surface area of the bottom of the vessel
Question 6.
Which one among the following doesn’t have any effect on velocity of sound ?
A. Pressure
B. Temperature
C. Humidity
D. Density
Ans: C. Humidity
Question 7.
Permissible noise level at Residential area during night time is :
A. 45 dB (A)
B. 55 dB (A)
C. 75 dB (A)
D. 80 dB (A)
Ans: A. 45 dB (A)
Question 8.
Echo is heard due to
A. Refraction
B. Scattering
C. Reflection
D. Interference
Ans: C. Reflection
Question 9.
For which of the following game, players must have the knowledge of Pascal’s law?
A. Climbing
B. Paragliding
C. Rafting
D. Scuba diving
Ans: D. Scuba diving
Question 10.
Velocity of sound in air does not change with the change of
A. Temperature of air
B. Pressure of air
C. Moisture content in air
D. Wind in the direction of propagation of sound
Ans: B. Pressure of air
Question 11.
Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s
A. 2000
B. 0.016
C. 1000
D. 0.008
Ans: D. 0.008
Question 12.
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is
A. The same in both cases in all respects
B. Of higher intensity when train arrives
C. Of higher pitch when train arrives
D. Of higher pitch when train departs
Ans: C. Of higher pitch when train arrives
Question 13.
Air pressure is usually highest when the air is
A. Warm and moist
B. Cool and dry
C. Warm and dry
D. Cool and moist
Ans: D. Cool and moist
Question 14.
The propagation of sound waves in a gas involves
A. Adiabatic compression and rarefaction
B. Isothermal compression and rarefaction
C. Isochoric compression and rarefaction
D. Isobaric compression and rarefaction
Ans: A. Adiabatic compression and rarefaction
Question 15.
Which waves cannot be transmitted through vacuum?
A. Electromagnetic
B. Light
C. Sound
D. Heat
Ans: C. Sound
Question 16.
The sound produced by a bat is–
A. Audible
B. Subsonic
C. Infrasonic
D. Ultrasonic
Ans: D. Ultrasonic
Question 17.
Which process allows water to enter the atmosphere?
A. Transpiration
B. Respiration
C. Condensation
D. Evaporation
Ans: D. Evaporation
Question 18.
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
A. Doppler effect
B. Beats
C. Resonance
D. Echo
Ans: B. Beats
Question 19.
Submerged objects can be located using
A. Radar
B. Sonar
C. Quasar
D. Pulsar
Ans: B. Sonar
Question 20.
Sound is heard over longer distances on rainy days because
A. Sound travels slowly in moist air
B. Sound travels faster in moist air
C. Moist air does not absorb sound
D. Moist air absorbs sound
Ans: B. Sound travels faster in moist air
Physics GK MCQs all set
- Physics MCQs Set-1
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