1. Sound amplification in the outer ear (auditory canal)is affected by:
a. Sound speed
b. Sound pressure
c. Sound amplitude - b. Sound pressure
2. Prolonged exposure to loud noise can cause permanent damage to:
a. The air conductivity (of the ear)
b. The structure of the eardrum (tympanic membrane)
c. Inner ear - c. Inner ear
3. The loss of elasticity (stiffening) of the tympanic membrane will result in:
a. Increase of air conductivity
b. Decrease of hearing threshold
c. Decrease in the binaural effect - b. Decrease of hearing threshold
4. Sound intensity level (dB) and Loudness (phones) will have the same magnitude at
the following frequency:
a. 20 Hz
b. 1000 Hz
c. 20 KHz - b. 1000 Hz
5. Refer to the equal-loudness curve above. At frequency of 4000 Hz the perceived
sound is:
a. Louder than at 1000 Hz
b. The same as at 1000 Hz
c. Softer than at 1000 Hz - a. Louder than at 1000 Hz
6. Sound Intensity Level is proportional to the logarithm of the ratio of incoming to
threshold intensity SIL = 10·Log (I/I0). If intensity is increased by a factor of 100, what is
change in SIL?
a. Increase by a factor of 10 (10 times)
b. Double (2 times)
,c. Increase with 20 dB (plus 20dB) - c. Increase with 20 dB (plus 20dB)
7. The sound intensity level in a room is 20 dB. A TV produces additional intensity level
of 60 dB. What is the sound intensity in the room now?
a. 80 dB
b. 40 dB
c. 60 dB - c. 60 dB
8. Match the physical (objective) with the corresponding psychophysical (subjective)
properties of the sound: (hint: multiple connections are possible)
a. Frequency
b. Intensity
c. Acoustic spectrum
1. Timbre
2. Pitch
3. Loudness - a. - 2.; b. - 3.; c. - 1.
9. Sound frequency is:
a. Psychophysical property (subjective)
b. Physical property (objective)
c. Sound is measured in wavelength, and light is measured in frequency - b. Physical
property (objective)
10. The fundamental harmonic (frequency f0) in a complex sound is characterized by:
a. The lowest frequency and highest amplitude
b. The highest frequency and lowest amplitude
c. The highest frequency and highest amplitude - a. The lowest frequency and highest
amplitude
11. The speed of sound is calculated by the Newton-Laplace formula √(K/ρ), where K is
the stiffness coefficient, and ρ is the density of the material. If the density of the
substance doubles, the speed of propagating sound wave will:
a. Increase
b. Decrease
c. Depends on the frequency - b. Decrease
12. What is the speed of sound in air?
a. 330 m/s
b. 900 m/s
,c. 1550 m/s - a. 330 m/s
13. Does absorption of sound and the corresponding penetration depth depend on the
wavelength?
a. No
b. It does. There is less absorption at longer wavelengths, and they propagate deeper
c. It does. There is less absorption at shorter wavelengths, and they propagate deeper -
b. It does. There is less absorption at longer wavelengths, and they propagate deeper
14. Is it possible for internal organs to generate sounds that propagate to the skin, and
are audible?
a. No
b. Yes, organs produce sounds that propagate through the tissues and are audible at
the skin
c. No, organs generate sounds but the waves are absorbed by the tissues and are
inaudible at the skin - b. Yes, organs produce sounds that propagate through the
tissues and are audible at the skin
15. Noise can be defined as:
a. Intense sound with constant frequency
b. Directed sound waves with low intensity and changing modulation
c. Superposition of random sound vibrations, with frequency and amplitude constantly
changing in time. - c. Superposition of random sound vibrations, with frequency and
amplitude constantly changing in time.
16. Damping oscillations are:
a. Oscillations with increasing amplitude
b. Oscillations with decreasing amplitude
c. Not related to amplitude - b. Oscillations with decreasing amplitude
17. If the amplitude of a wave doubles (x2), what would happen to the period?
a. It will double
b. It will be halved
c. There will be no change - c. There will be no change
18. In which of the following mediums, sound waves cannot propagate?
a. Gases
b. Liquids
c. Vacuum - c. Vacuum
, 19. Which of the following waves are NOT mechanical?
a. Light
b. Water waves
c. Sound waves - a. Light
20. A propagating sound wave transfers:
a. Energy
b. Matter
c. Both, energy and matter - a. Energy
21. Which of the following factors has the most significant effect on the speed of
propagation of sound waves?
a. Elastic properties of the medium
b. The size of the wave front
c. The pressure in gaseous environment - a. Elastic properties of the medium
22. Sound waves are:
a. Mechanical waves
b. Electromagnetic waves
c. Gravitational waves - a. Mechanical waves
23. The speed of sound (in non-dispersive medium):
a. Depends on the properties of the propagating medium
b. Is always constant, independent of the medium
c. Decreases as sound moves away from the its source - a. Depends on the properties
of the propagating medium
24. Human ear is most sensitive to frequencies (refer to equal-loudness curve):
a. Below 1000 Hz
b. From 2000 Hz to 5000 Hz
c. Above 5000 Hz - b. From 2000 Hz to 5000 Hz
25. What is the meaning of 0 dB?
a. There is no sound
b. The sound is below hearing threshold level
c. The sound is at threshold reference level - c. The sound is at threshold reference
level
26. Timbre is:
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