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Audiogram - Medical Physics - MCQs

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Medical Physics Quiz sobre Audiogram - Medical Physics - MCQs, criado por Hussain Basheer em 23-11-2018.
Hussain Basheer
Quiz por Hussain Basheer, atualizado more than 1 year ago
Hussain Basheer
Criado por Hussain Basheer mais de 5 anos atrás
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Resumo de Recurso

Questão 1

Questão
Sound amplification in the outer ear (auditory canal)is affected by:
Responda
  • Sound speed
  • Sound pressure
  • Sound amplitude

Questão 2

Questão
Prolonged exposure to loud noise can cause permanent damage to:
Responda
  • The air conductivity (of the ear)
  • The structure of the eardrum (tympanic membrane)
  • Inner ear

Questão 3

Questão
The loss of elasticity (stiffening) of the tympanic membrane will result in:
Responda
  • Increase of air conductivity
  • Decrease of hearing threshold
  • Decrease in the binaural effect

Questão 4

Questão
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)
Responda
  • 20 Hz
  • 1000 Hz
  • 20 KHz

Questão 5

Questão
Refer to the equal-loudness curve above. At frequency of 4000 Hz the perceived sound is:
Responda
  • Louder than at 1000 Hz
  • The same as at 1000 Hz
  • Softer than at 1000 Hz

Questão 6

Questão
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?
Responda
  • Increase by a factor of 10 (10 times)
  • Double (2 times)
  • Increase with 20 dB (plus 20dB)

Questão 7

Questão
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?
Responda
  • 80 dB
  • 40 dB
  • 60 dB

Questão 8

Questão
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
Responda
  • Frequency - Loudness Intensity - Timbre Acoustic Spectrum - Pitch
  • Intensity - Pitch Acoustic spectrum - Loudness Frequency - Timbre
  • Acoustic spectrum - Timbre Intensity - Loudness Frequency - Pitch

Questão 9

Questão
Sound frequency is:
Responda
  • Psychophysical property (subjective)
  • Physical property (objective)
  • Sound is measured in wavelength, and light is measured in frequency

Questão 10

Questão
The fundamental harmonic (frequency f0) in a complex sound is characterized by:
Responda
  • The lowest frequency and highest amplitude
  • The highest frequency and lowest amplitude
  • The highest frequency and highest amplitude

Questão 11

Questão
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:
Responda
  • Increase
  • Decrease
  • Depends on the frequency

Questão 12

Questão
What is the speed of sound in air?
Responda
  • 330 m/s
  • 900 m/s
  • 1550 m/s

Questão 13

Questão
Does absorption of sound and the corresponding penetration depth depend on the wavelength?
Responda
  • No
  • It does. There is less absorption at longer wavelengths, and they propagate deeper
  • It does. There is less absorption at shorter wavelengths, and they propagate deeper

Questão 14

Questão
Is it possible for internal organs to generate sounds that propagate to the skin, and are audible?
Responda
  • No
  • Yes, organs produce sounds that propagate through the tissues and are audible at the skin
  • No, organs generate sounds but the waves are absorbed by the tissues and are inaudible at the skin

Questão 15

Questão
Noise can be defined as:
Responda
  • Intense sound with constant frequency
  • Directed sound waves with low intensity and changing modulation
  • Superposition of random sound vibrations, with frequency and amplitude constantly changing in time.

Questão 16

Questão
Damping oscillations are:
Responda
  • Oscillations with increasing amplitude
  • Oscillations with decreasing amplitude
  • Not related to amplitude

Questão 17

Questão
If the amplitude of a wave doubles (x2), what would happen to the period?
Responda
  • It will double
  • It will be halved
  • There will be no change

Questão 18

Questão
which of the following mediums, sound waves cannot propagate?
Responda
  • Gases
  • Liquids
  • Vacuum

Questão 19

Questão
Which of the following waves are NOT mechanical?
Responda
  • Light
  • Water waves
  • Sound waves

Questão 20

Questão
A propagating sound wave transfers:
Responda
  • Energy
  • Matter
  • Both, energy and matter

Questão 21

Questão
Which of the following factors has the most significant effect on the speed of propagation of sound waves?
Responda
  • Elastic properties of the medium
  • The size of the wave front
  • The pressure in gaseous environment

Questão 22

Questão
Sound waves are:
Responda
  • Mechanical waves
  • Electromagnetic waves
  • Gravitational waves

Questão 23

Questão
The speed of sound (in non-dispersive medium):
Responda
  • Depends on the properties of the propagating medium
  • Is always constant, independent of the medium
  • Decreases as sound moves away from the its source

Questão 24

Questão
Human ear is most sensitive to frequencies (refer to equal-loudness curve):
Responda
  • Below 1000 Hz
  • From 2000 Hz to 5000 Hz
  • Above 5000 Hz

Questão 25

Questão
What is the meaning of 0 dB?
Responda
  • There is no sound
  • The sound is below hearing threshold level
  • The sound is at threshold reference level

Questão 26

Questão
Timbre is:
Responda
  • Physical (objective) property of sound
  • Psychophysical (subjective) sound property
  • Type of wood found in North America

Questão 27

Questão
The pitch of sound depends mostly on:
Responda
  • Intensity of sound
  • Sound pressure
  • Sound frequency

Questão 28

Questão
Which of the following does NOT have relevance to the reflection/transmission of sound waves?
Responda
  • The acoustic impedance of substances at the boundary
  • The colors of substances near the boundary area
  • The cross sectional area of the boundary surface

Questão 29

Questão
Timbre is related to:
Responda
  • Harmonic overtones
  • Wooden instruments
  • Falling trees

Questão 30

Questão
Weber-Fechner law (in psychophysics) describes a logarithmic relationship between the intensity of a sound wave and….:
Responda
  • Acoustic pressure
  • The sound pitch
  • The perception of loudness

Questão 31

Questão
Intensity is defined as:
Responda
  • Power per area
  • Power per time
  • Energy per time

Questão 32

Questão
When sound wave travels across two materials with similar acoustic impedance, at the boundary surface there will be:
Responda
  • similar amounts of transmission and reflection
  • more transmission and less reflection
  • less transmission and more reflection

Questão 33

Questão
The acoustic impedance Z of a substance is defined as the product of:
Responda
  • The density and the atomic number of the element: ρZ
  • The density and the speed of sound: ρv
  • The temperature and the speed of sound: tv

Questão 34

Questão
Why can’t we hear voices (speech) when submerged under water?
Responda
  • Most of the sound is reflected at the air/water boundary
  • Sound waves do not propagate under water
  • Ear canals are clogged with water

Questão 35

Questão
What property of sound is measured in decibels (dB)?
Responda
  • Wavelength
  • Intensity level
  • Loudness

Questão 36

Questão
If the period of a wave is 0.02 s, what is its frequency? (Hint: how often does it vibrate in one second?)
Responda
  • 200 Hz
  • 100 Hz
  • 50 Hz

Questão 37

Questão
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)?
Responda
  • 1020 m
  • 340m
  • 680m

Questão 38

Questão
Which of the following properties of sound is measured in Hertz (Hz)?
Responda
  • Power
  • Amplitude
  • Frequency

Questão 39

Questão
When sound wave propagates between two media with similar impedance, there will be:
Responda
  • Equal amounts of transmission and reflection
  • Be more transmission and less reflection
  • Be more reflection and less transmission

Questão 40

Questão
The human ear is sensitive to frequencies in the range:
Responda
  • 20 Hz – 20 MHz
  • 200 Hz – 20 kHz
  • 20 Hz – 2000 Hz

Questão 41

Questão
What are the SI units for loudness?
Responda
  • Sone
  • Phon
  • dB

Questão 42

Questão
The speed of sound in the human body is approximately:
Responda
  • 330 m/s
  • 1500 m/s
  • 6000 m/s

Questão 43

Questão
The audiogram is a method for hearing loss evaluation by measuring the threshold hearing intensity of sound for different:
Responda
  • Frequencies
  • Wavelengths
  • Amplitudes

Questão 44

Questão
Pure tone is characterized by:
Responda
  • Deviation from the equilibrium is proportional to the frequency
  • Constant velocity vector
  • Constant frequency

Questão 45

Questão
When sound wave travels from air into the human body, what happens to its speed?
Responda
  • Increases, because tissue has higher acoustic impedance
  • Decreases, because tissue has lower acoustic impedance
  • It doesn’t change because the speed of sound is constant

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