1. The ambient noise level may be defined as _________, whereas the peak level is _________.

First blank	A. L10	B. L50	C. L90	D. LA
Second blank	A. L10	B. L50	C. L90	D. LA

2. The average sound intensity over a given time, expressed in decibels, is called _________.

A. L50

B. LA

C. Ldn

D. Leq

3. On a sound level meter, the LA_eq value indicates the instantaneous level in dBA. T or F

4. When the blood supply to the hair cells is diminished, the result may be _______.

A. TTS

B. dizziness

C. poor circulation to the hands and feet

D. all of the above

5. Vasoconstriction refers to a dilation of the blood vessels which may be the result of noise exposure. T or F

6. Which term does NOT refer to a speech intelligibility measurement?

A. AI

B. SIL

C. STI

D. NIPTS

7. A single exposure to a noise around 65 dBA may be sufficient to raise sleep level without waking. T or F

8. PNC levels for indoor environments specify the __________ levels considered acceptable.

A. ambient noise

B. average noise

C. peak noise

D. perceived noise

9. The Wilson Committee on Noise study of Heathrow Airport devised the _______ measurement system to evaluate aircraft noise.

A. TNI

B. NNI

C. CNEL

D. NEF

10. Which measurement system does NOT use PNdB in its calculations?

A. NNI

B. EPNdB

C. NEF

D. CNEL

11. NEF levels are used to predict the degree of community annoyance for traffic noise, and are therefore used to establish acceptable community standards. T or F

12. The loudness of octave-band noise components may be summed in units of _______ to arrive at a PNdB level.

A. phons

B. sones

C. dB

D. noys

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