Medical Physics MCQs EXAM QUESTIONS WITH COMPLETE SOLUTIONS

Medical Physics MCQs EXAM
QUESTIONS WITH COMPLETE
SOLUTIONS


1. Sound amplification in the outer ear (auditory canal)is affected by:
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a. Sound speed
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b. Sound pressure
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c. Sound amplitude - CORRECT ANSWER✔✔-b. Sound pressure
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2. Prolonged exposure to loud noise can cause permanent damage to:
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a. The air conductivity (of the ear)
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b. The structure of the eardrum (tympanic membrane)
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c. Inner ear - CORRECT ANSWER✔✔-c. Inner ear
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3. The loss of elasticity (stiffening) of the tympanic membrane will result
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in:
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a. Increase of air conductivity
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b. Decrease of hearing threshold
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,c. Decrease in the binaural effect - CORRECT ANSWER✔✔-b. Decrease
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of hearing threshold
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4. Sound intensity level (dB) and Loudness (phones) will have the same
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magnitude at the following frequency: | | | |




a. 20 Hz
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b. 1000 Hz
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c. 20 KHz - CORRECT ANSWER✔✔-b. 1000 Hz
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5. Refer to the equal-loudness curve above. At frequency of 4000 Hz the
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perceived sound is:
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a. Louder than at 1000 Hz
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b. The same as at 1000 Hz
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c. Softer than at 1000 Hz - CORRECT ANSWER✔✔-a. Louder than at
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1000 Hz |




6. Sound Intensity Level is proportional to the logarithm of the ratio of
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incoming to threshold intensity SIL = 10·Log (I/I0). If intensity is
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increased by a factor of 100, what is change in SIL?
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a. Increase by a factor of 10 (10 times)
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,b. Double (2 times)
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c. Increase with 20 dB (plus 20dB) - CORRECT ANSWER✔✔-c. Increase
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with 20 dB (plus 20dB)
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7. The sound intensity level in a room is 20 dB. A TV produces additional
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intensity level of 60 dB. What is the sound intensity in the room now?
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a. 80 dB
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b. 40 dB
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c. 60 dB - CORRECT ANSWER✔✔-c. 60 dB
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8. Match the physical (objective) with the corresponding psychophysical
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(subjective) properties of the sound: (hint: multiple connections are
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possible)


a. Frequency
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b. Intensity
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c. Acoustic spectrum
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1. Timbre
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2. Pitch
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3. Loudness - CORRECT ANSWER✔✔-a. - 2.; b. - 3.; c. - 1.
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, 9. Sound frequency is:
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a. Psychophysical property (subjective)
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b. Physical property (objective)
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c. Sound is measured in wavelength, and light is measured in frequency
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- CORRECT ANSWER✔✔-b. Physical property (objective)
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10. The fundamental harmonic (frequency f0) in a complex sound is
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characterized by: |




a. The lowest frequency and highest amplitude
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b. The highest frequency and lowest amplitude
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c. The highest frequency and highest amplitude - CORRECT
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ANSWER✔✔-a. The lowest frequency and highest amplitude | | | | | |




11. The speed of sound is calculated by the Newton-Laplace formula
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√(K/ρ), where K is the stiffness coefficient, and ρ is the density of the
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material. If the density of the substance doubles, the speed of
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propagating sound wave will: | | |




a. Increase
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b. Decrease
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