Question 1.
The unit of noise pollution (level) is :
A. Decibel
B. Decimal
C. Ppm
D. None of these
Ans: A. Decibel
Question 2.
Hertz is the SI unit of
A. Weight
B. Power
C. Pressure
D. Frequency
Ans: D. Frequency
Question 3.
Noise is measured in
A. Watt
B. REM
C. Centigrade
D. Decibel
Ans: D. Decibel
Question 4.
What is the SI unit of intensity of sound?
A. Decibel
B. Newton
C. Heartz
D. Tesla
Ans: A. Decibel
Question 5.
The speed of sound travel fastest through
A. Liquid
B. Solid
C. Gas
D. None of the above
Ans: B. Solid
Question 6.
The velocity of the sound is highest in
A. Metal
B. Air
C. Water
D. Vacuum
Ans: A. Metal
Question 7.
Man perceives sound vibrations in the frequency ranges of
A. 0 – 5 Hz
B. 6 – 10 Hz
C. 11 – 20 Hz
D. 20 – 20000 Hz
Ans: D. 20 – 20000 Hz
Question 8.
Sound cannot pass through
A. Water
B. Steel
C. Air
D. Vacuum
Ans: D. Vacuum
Question 9.
Compressions and Rarefactions are characteristic of
A. Longitudinal waves
B. Transverse waves
C. Both A & B
D. Neither of A & B
Ans: A. Longitudinal waves
Question 10.
The ordinary and maximum tolerance limit of sound by human being is
A. 50 db to 70 db (decibel)
B. 60 db to 80 db (decibel)
C. 65 db to 75 db (decibel)
D. 70 db to 85 db (decibel)
Ans: B. 60 db to 80 db (decibel)
Question 11.
Instrument used to study the behaviour of a vibrating string is :
A. Barometer
B. Hydrometer
C. Hygrometer
D. Sonometer
Ans: D. Sonometer
Question 12.
Sound waves cannot travel in
A. Vacuum
B. Water
C. Glass
D. Hydrogen gas
Ans: A. Vacuum
Question 13.
Least audible sound for most of the human ear is :
A. 10.0 µ bar
B. 0.0002 µ bar
C. 0.005 µ bar
D. 5.0 µ bar
Ans: B. 0.0002 µ bar
Question 14.
In SONAR which kind of wave is used?
A. Infrasonic
B. Ultrasonic
C. Radio
D. Audible sound
Ans: B. Ultrasonic
Question 15.
Among the following materials sound travels fastest in
A. Steel
B. Air
C. Vacuum
D. Water
Ans: A. Steel
Question 16.
The quality or tone of a musical sound produced by a stringed instrument depends on
A. Frequency of vibration
B. Length of the strings in the instrument
C. Amplitude of vibration
D. Wave form of the sound
Ans: D. Wave form of the sound
Question 17.
Hertz is a unit for measuring
A. Intensity of waves
B. Frequency of waves
C. Wavelength
D. Clarity of waves
Ans: B. Frequency of waves
Question 18.
Sound waves cannot travel through
A. Gas
B. Liquid
C. Vacuum
D. Solid
Ans: C. Vacuum
Question 19.
Sound becomes hazardous noise pollution at decibels?
A. Above 120 db
B. Above 80 db
C. Above 50 db
D. Above 30 db
Ans: A. Above 120 db
Question 20.
Which determines the frequency of a sound wave?
A. Amplitude
B. Speed
C. Source
D. Medium
Ans: A. Amplitude
Physics GK MCQs all set
- Physics MCQs Set-1
- Physics MCQs Set-2
- Physics MCQs Set-3
- Physics MCQs Set-4
- Physics MCQs Set-5
- Physics MCQs Set-6
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- Physics MCQs Set-75
- Physics MCQs Set-76
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