16127313
Descripción
Test por Hussain Basheer, actualizado hace más de 1 año
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Creado por Hussain Basheer
hace alrededor de 6 años
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Pregunta 1
Pregunta
Sound amplification in the outer ear (auditory canal)is affected by:
Respuesta
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Sound speed
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Sound pressure
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Sound amplitude
Pregunta 2
Pregunta
Prolonged exposure to loud noise can cause permanent damage to:
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The air conductivity (of the ear)
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The structure of the eardrum (tympanic membrane)
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Inner ear
Pregunta 3
Pregunta
The loss of elasticity (stiffening) of the tympanic membrane will result in:
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Increase of air conductivity
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Decrease of hearing threshold
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Decrease in the binaural effect
Pregunta 4
Pregunta
Sound intensity level (dB) and Loudness (phones) will have the same magnitude at the following frequency: (ref. the equal-loudness graph, Fig.1)
Image:
Mobile upload (image/jpeg)
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20 Hz
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1000 Hz
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20 KHz
Pregunta 5
Pregunta
Refer to the equal-loudness curve above. At frequency of 4000 Hz the perceived sound is:
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Louder than at 1000 Hz
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The same as at 1000 Hz
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Softer than at 1000 Hz
Pregunta 6
Pregunta
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?
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Increase by a factor of 10 (10 times)
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Double (2 times)
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Increase with 20 dB (plus 20dB)
Pregunta 7
Pregunta
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?
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80 dB
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40 dB
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60 dB
Pregunta 8
Pregunta
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
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Frequency - Loudness Intensity - Timbre Acoustic Spectrum - Pitch
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Intensity - Pitch Acoustic spectrum - Loudness Frequency - Timbre
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Acoustic spectrum - Timbre Intensity - Loudness Frequency - Pitch
Pregunta 9
Pregunta
Sound frequency is:
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Psychophysical property (subjective)
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Physical property (objective)
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Sound is measured in wavelength, and light is measured in frequency
Pregunta 10
Pregunta
The fundamental harmonic (frequency f0) in a complex sound is characterized by:
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The lowest frequency and highest amplitude
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The highest frequency and lowest amplitude
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The highest frequency and highest amplitude
Pregunta 11
Pregunta
The speed of sound is calculated by the Newton-Laplace formula √ , 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:
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Increase
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Decrease
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Depends on the frequency
Pregunta 12
Pregunta
What is the speed of sound in air?
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330 m/s
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900 m/s
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1550 m/s
Pregunta 13
Pregunta
Does absorption of sound and the corresponding penetration depth depend on the wavelength?
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No
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It does. There is less absorption at longer wavelengths, and they propagate deeper
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It does. There is less absorption at shorter wavelengths, and they propagate deeper
Pregunta 14
Pregunta
Is it possible for internal organs to generate sounds that propagate to the skin, and are audible?
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No
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Yes, organs produce sounds that propagate through the tissues and are audible at the skin
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No, organs generate sounds but the waves are absorbed by the tissues and are inaudible at the skin
Pregunta 15
Pregunta
Noise can be defined as:
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Intense sound with constant frequency
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Directed sound waves with low intensity and changing modulation
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Superposition of random sound vibrations, with frequency and amplitude constantly changing in time.
Pregunta 16
Pregunta
Damping oscillations are:
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Oscillations with increasing amplitude
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Oscillations with decreasing amplitude
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Not related to amplitude
Pregunta 17
Pregunta
If the amplitude of a wave doubles (x2), what would happen to the period?
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It will double
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It will be halved
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There will be no change
Pregunta 18
Pregunta
which of the following mediums, sound waves cannot propagate?
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Gases
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Liquids
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Vacuum
Pregunta 19
Pregunta
Which of the following waves are NOT mechanical?
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Light
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Water waves
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Sound waves
Pregunta 20
Pregunta
A propagating sound wave transfers:
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Energy
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Matter
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Both, energy and matter
Pregunta 21
Pregunta
Which of the following factors has the most significant effect on the speed of propagation of sound waves?
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Elastic properties of the medium
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The size of the wave front
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The pressure in gaseous environment
Pregunta 22
Pregunta
Sound waves are:
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Mechanical waves
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Electromagnetic waves
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Gravitational waves
Pregunta 23
Pregunta
The speed of sound (in non-dispersive medium):
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Depends on the properties of the propagating medium
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Is always constant, independent of the medium
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Decreases as sound moves away from the its source
Pregunta 24
Pregunta
Human ear is most sensitive to frequencies (refer to equal-loudness curve):
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Below 1000 Hz
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From 2000 Hz to 5000 Hz
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Above 5000 Hz
Pregunta 25
Pregunta
What is the meaning of 0 dB?
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There is no sound
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The sound is below hearing threshold level
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The sound is at threshold reference level
Pregunta 26
Pregunta
Timbre is:
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Physical (objective) property of sound
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Psychophysical (subjective) sound property
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Type of wood found in North America
Pregunta 27
Pregunta
The pitch of sound depends mostly on:
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Intensity of sound
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Sound pressure
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Sound frequency
Pregunta 28
Pregunta
Which of the following does NOT have relevance to the reflection/transmission of sound waves?
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The acoustic impedance of substances at the boundary
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The colors of substances near the boundary area
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The cross sectional area of the boundary surface
Pregunta 29
Pregunta
Timbre is related to:
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Harmonic overtones
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Wooden instruments
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Falling trees
Pregunta 30
Pregunta
Weber-Fechner law (in psychophysics) describes a logarithmic relationship between the intensity of a sound wave and….:
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Acoustic pressure
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The sound pitch
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The perception of loudness
Pregunta 31
Pregunta
Intensity is defined as:
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Power per area
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Power per time
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Energy per time
Pregunta 32
Pregunta
When sound wave travels across two materials with similar acoustic impedance, at the boundary surface there will be:
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similar amounts of transmission and reflection
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more transmission and less reflection
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less transmission and more reflection
Pregunta 33
Pregunta
The acoustic impedance Z of a substance is defined as the product of:
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The density and the atomic number of the element: ρZ
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The density and the speed of sound: ρv
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The temperature and the speed of sound: tv
Pregunta 34
Pregunta
Why can’t we hear voices (speech) when submerged under water?
Respuesta
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Most of the sound is reflected at the air/water boundary
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Sound waves do not propagate under water
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Ear canals are clogged with water
Pregunta 35
Pregunta
What property of sound is measured in decibels (dB)?
Respuesta
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Wavelength
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Intensity level
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Loudness
Pregunta 36
Pregunta
If the period of a wave is 0.02 s, what is its frequency? (Hint: how often does it vibrate in one second?)
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200 Hz
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100 Hz
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50 Hz
Pregunta 37
Pregunta
A person screams in the mountain and hears the echo after 2 seconds. How far was the cliff that caused the reflection of the sound (echo)?
Respuesta
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1020 m
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340m
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680m
Pregunta 38
Pregunta
Which of the following properties of sound is measured in Hertz (Hz)?
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Power
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Amplitude
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Frequency
Pregunta 39
Pregunta
When sound wave propagates between two media with similar impedance, there will be:
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Equal amounts of transmission and reflection
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Be more transmission and less reflection
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Be more reflection and less transmission
Pregunta 40
Pregunta
The human ear is sensitive to frequencies in the range:
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20 Hz – 20 MHz
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200 Hz – 20 kHz
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20 Hz – 2000 Hz
Pregunta 41
Pregunta
What are the SI units for loudness?
Respuesta
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Sone
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Phon
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dB
Pregunta 42
Pregunta
The speed of sound in the human body is approximately:
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330 m/s
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1500 m/s
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6000 m/s
Pregunta 43
Pregunta
The audiogram is a method for hearing loss evaluation by measuring the threshold hearing intensity of sound for different:
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Frequencies
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Wavelengths
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Amplitudes
Pregunta 44
Pregunta
Pure tone is characterized by:
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Deviation from the equilibrium is proportional to the frequency
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Constant velocity vector
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Constant frequency
Pregunta 45
Pregunta
When sound wave travels from air into the human body, what happens to its speed?
Respuesta
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Increases, because tissue has higher acoustic impedance
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Decreases, because tissue has lower acoustic impedance
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It doesn’t change because the speed of sound is constant
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