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Medical Physics MCQS Questions With Complete Solutions
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Medical Physics MCQS Questions With Complete Solutions
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Medical Physics MCQS Questions WithComplete Solutions
Sound Amplification in the outer ear is (auditory canal) is affected by correct answer: Sound Pressure
Prolonged exposure to loud noise can cause permanent damage to? correct answer: Inner ear
The loss of elasticity (stiffening) of the tympanic membrane will
result in correct answer: Decrease of hearing threshold
Sound intensity level (dB) and Loudness (Phones) will have the same magnitude at the following frequency correct answer: 1000 Hz
Equal Loudness curve:
At frequency of 4000 Hz the perceived sound is correct answer: Louder than at 1000 Hz
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 correct answer: Increase with 20 dB (plus 20dB)
The sound intensity level in a room is 20dB. A TV produces additional intensity level of 60 dB. What is the sound intensity in the room now? correct answer: 60dB Match the physical (objective) with the corresponding psychophysical (subjective) properties of the sound
Frequency ........ Intensity .......
Acoustic Spectrum ......... correct answer: Frequency - Timbre Intensity - Pitch Acoustic Spectrum - Loudness
Sound Frequency is correct answer: Physical property (objective)
The fundamental harmonic (frequency f0) in a complex sound is
characterised by correct answer: The lowest frequency and highest amplitude
The speed of sound is calculated by the Newton - Laplace formula c = k/p (square rooted) where K is the stiffness coefficient, and p is the density of the material. If the density of the substance doubles, the speed of propagating sound wave will
correct answer: Decrease
What is the speed of sound in air correct answer: 330m/s
Does absorption of sound and the corresponding penetration depth depend on the wavelength? correct answer: It does. There
is less absorption at longer wavelengths, and they propagate deeper
Is it possible for internal organise to generate sounds that propagate to the skin and are audible? correct answer: Yes, Organs produce sounds that propagate through the tissues and are audible at the skin
Noise can be defined as correct answer: Superposition of random sound vibrations, with frequency and amplitude constantly changing in time
Damping oscillations are correct answer: oscillations with decreasing amplitude
If the amplitude of a wave doubles (x2), what would happen to the period? correct answer: There will be no change
In which of the following mediums, sound waves cannot propagate? correct answer: Vacuum
Which of the following waves are not mechanical? correct answer: Light
A propagating sound wave transfers correct answer: Energy
Which of the following factors has the most significant effect on
the speed of propagation of sound waves? correct answer: Elastic properties of the medium
Sound waves are correct answer: mechanical waves
The speed of sound ( in non dispersive medium) correct answer: Depends on the properties of the propagating medium Human ear is most sensitive to frequencies ( refer to equal loudness curve) correct answer: From 2000 Hz to 5000Hz
What is meaning of 0dB correct answer: The sound is at threshold reference level
Timbre is correct answer: Psychophysical (subjective) sound property
The pitch of sound depends mostly on correct answer: Sound frequency
Which of the following does not have relevance to the reflection/transmission of sound waves? correct answer: The colours of substances near the boundary area
Timbre is related to correct answer: Harmonic overtones
Weber-fechner law (in psychophysics) describes a logarithmic relationship between the intensity of a sound wave and ......? correct answer: The perception of loudness
Intensity is defined as? correct answer: Power per area
When sound wave travels across two materials with similar acoustic impedance, at the boundary surface will be correct answer: more transmission and less reflection
The acoustic impedance Z of a substance is defined as the product of correct answer: The density and the speed of sound: pv
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