Sound & Acoustics MCQs with Answers

The six strings of a guitar are the same length under nearly the same tension, but they have different thickness. On which string do waves travel the fastest?

• A.The thinnest string
• B.The thickest string
• C.All strings have the same wave speed
• D.The middle string

No sound can be heard in a?

• A.Vacuum
• B.Air
• C.Water
• D.Solid

Noise pollution/intensity is measured in ?

• A.Hertz (Hz)
• B.Decibels (dB)
• C.Watts per square meter (W/m²)
• D.Pascals (Pa)

Past Paper MCQ

The speed of sound is fastest in

• A.Vacuum
• B.Liquids
• C.Gases
• D.Solids

Select the appropriate Doppler equation when the source is approaching a stationary observer, where fo is the observed frequency, fs is the frequency of source, v is the speed of sound, and vs is the speed of source relative to the observer.

• A.fo = ((v + vs) / v) fs
• B.fo = (v / (v + vs)) fs
• C.fo = ((v - vs) / v) fs
• D.fo = (v / (v - vs)) fs

A police car, with its siren on, is moving towards a stationary listener. How does the stationary listener receive the frequency of the sound emitted by the siren?

• A.Increases
• B.Decreases
• C.Remains the same
• D.First increases then decreases

The voice of a mosquito is quite distinct from that of a lion because?

• A.The frequencies of the two sounds differ widely
• B.The amplitudes of the two sounds differ widely
• C.The wavelengths of the two sounds are identical
• D.The speed of sound differs for each animal

Which type of signals are used by sonar?

• A.Radio waves
• B.Sound waves
• C.Light waves
• D.Microwaves

Distance from crest to crest of any wave is called ?

• A.Amplitude
• B.Frequency
• C.Wavelength
• D.Time period

What angle do longitudinal waves make during their propagation?

• A.0 degrees
• B.90 degrees
• C.45 degrees
• D.180 degrees