18.
When the pressure of a sound varies in a perfectly periodic manner, the sound is
termed as a:
a. Tone.
b. Sound.
c.
Decibel.
d. Frequency.
19.
The ___________________ is a graphic record of an individual's hearing
sensitivity.
a. Audiometer.
b. Audiogram.
c.
Impulse of noise.
d. Level sound meter.
20.
Which electronic device needs to be calibrated before use?
a. Audiometer.
b. dB(P).
c.
Microphone.
d. Ear muff.
MD0165
3-33
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