PHY 122

Applied Physics

Chapter 6 : Sound

DAE Common Technologies | First Year

MCQs

Chapter:6 (Sound)

Question 1:

The velocity of sound in air at \({0^{0}}C\) is:

\(3 × {10^8} m/s\) \(330 km/s\) \(331.3 m/s\) \(3300 m/s\)

Question 2:

Sound waves are:

Transverse waves Longitudinal waves Electromagnetic waves Matter waves

Question 3:

The speed of sound is greatest in:

Iron Water Air Vacuum

Question 4:

Unit of intensity level of sound is:

Graham Bel Hertz \(W{m^{-2}}\) Decibel

Question 5:

Sounds of frequencies higher than 20,000 hertz are called:

Harmonic Ultrasonic Supersonic Beats

Question 6:

The property or characteristic of sound by which a shrill sound can be distinguished from a grave one is called:

Pitch of sound Quality of sound Wavelength of sound Intensity of sound

Question 7:

The unit of intensity of sound is:

\(watt/m\) \(watt/{m^2}\) \(N/m\) \(Bell\)

Question 8:

Ear of normal human being response to the frequencies of sound between:

20 to 200 Hz 20 to 2000 Hz 20 to 20,000 Hz 2000 to 30,000 Hz

Question 9:

For destructive interference of sound waves the condition for path difference is:

\(S = n \lambda\) \(S = 2n \lambda\) \(S = (2n + 1) \lambda\) \(S = (2n + 1) {\frac{\lambda}{2}}\)

Question 10:

Two tuning forks of frequencies 250 and 252 hertz are heard simultaneously. The number of beats will be:

1 2 4 502

Question 11:

The change in the pitch of sound caused by the relative motion of either the source of sound or the listener is called the:

Doppler’s Effect Beats Echo Acoustics

Question 12:

The relationship between velocity ‘\(V\)’, frequency ‘\(f\)’ and wavelength ‘\(\lambda\)’ of a wave is:

\(f = V \lambda\) \(V = f \lambda\) \(\lambda = V f\) \(V = {\frac{f}{\lambda}}\)

NOTE
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INSTRUCTOR
MUHAMMAD BIN JAMEEL
BSC ENGG. CIVIL

PBTE DAE PHY-122 Applied Physics | Chapter 6 : Sound | MCQs