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What type of wave is a sound wave?
o A) Transverse, electromagnetic
o B) Longitudinal, mechanical
o C) Transverse, mechanical
o D) Longitudinal, electromagnetic
Correct Answer: B) Longitudinal, mechanical
Rationale: Sound waves require a medium to travel and are classified as
longitudinal waves because the particle motion is parallel to the direction of
the wave propagation.
2. Molecules of the medium vibrate at 90 degrees to the direction of the traveling
wave. What type of wave is this?
o A) Longitudinal wave
o B) Transverse wave
o C) Surface wave
o D) Sound wave
Correct Answer: B) Transverse wave
Rationale: In transverse waves, particle motion is perpendicular (90 degrees)
to the direction of wave propagation.
3. What is the range of audible sound?
o A) 1 Hz to 1 kHz
o B) 10 Hz to 10 kHz
o C) 20 Hz to 20 kHz
o D) 50 Hz to 50 kHz
Correct Answer: C) 20 Hz to 20 kHz
, Rationale: The range of human hearing falls between 20 Hz and 20 kHz,
which defines the audible sound spectrum.
4. What is the portion of a cycle where the molecules are pushed closer together?
o A) Compression
o B) Rarefaction
o C) Wavelength
o D) Amplitude
Correct Answer: A) Compression
Rationale: Compression is the phase in which molecules are forced closer
together, increasing pressure in that region of the wave.
5. What is the portion of a cycle where the molecules spread farther apart?
o A) Compression
o B) Rarefaction
o C) Wavelength
o D) Frequency
Correct Answer: B) Rarefaction
Rationale: Rarefaction is the part of the wave where molecules are spread
out, resulting in a lower pressure region.
6. What are the three primary acoustic variables?
o A) Frequency, power, intensity
o B) Pressure, density, particle motion
o C) Wavelength, amplitude, velocity
o D) Pressure, power, speed
Correct Answer: B) Pressure, density, particle motion
Rationale: Acoustic variables describe how sound waves interact with the
medium and include pressure, density, and particle motion.
7. The time it takes for one cycle to occur is called:
o A) Frequency
o B) Period
, o C) Wavelength
o D) Amplitude
Correct Answer: B) Period
Rationale: Period is the time it takes for one complete cycle of the wave.
8. The number of cycles per second is known as:
o A) Amplitude
o B) Period
o C) Frequency
o D) Wavelength
Correct Answer: C) Frequency
Rationale: Frequency is measured in Hertz (Hz) and refers to the number of
cycles per second.
9. What is the relationship between period and frequency?
o A) Direct
o B) Inverse
o C) Proportional
o D) Unrelated
Correct Answer: B) Inverse
Rationale: As the frequency increases, the period decreases, and vice versa,
making the relationship inverse.
10. The speed at which sound travels through a medium is called:
o A) Frequency
o B) Wavelength
o C) Propagation speed
o D) Amplitude
Correct Answer: C) Propagation speed
Rationale: Propagation speed is the rate at which a sound wave travels
through a medium, determined by the medium's properties.
11. What is the relationship between stiffness and propagation speed?
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