1. Decibel is a unit used to measure the intensity of a sound. What is the symble ofdecibel? a. Hz b. db c. HL d. none of the above *
A
B
C
D

This is a required question
2. Hertz is a unit of frequency, the symble is ______? a. Hz b. dB c. HL d. none of the above *
A
B
C
D
3. Occupational HL is gradual hearing loss, what is HL?a. Hertz b. decibel c. Hearing Loss d. none of the above *
A
B
C
D
4. We can control sources of noise, what noise is uncotrolable? A. thunder B. radio C. televison D. noise outside *
A
B
C
D
5. Why do we need to plant trees to control the noise?A. it absorbs energy C. it absorbs heat B. it absorbs light D. it absorbs sounds and vibrations *
A
B
C
D
6. To decrease the level of sound you can use the following except one. A. earplugs B. closing doors C. cover your ears D. earphones *
A
B
C
D
7. Practice closing doors and windows to avoid _____ coming from outside. a. air b. water c. noise d. people *
A
B
C
D
8. Practice speaking in ____ voice can help control noise pollution. a. loud b. shout c. low d. high *
A
B
C
D
9. Practicing to turn off radio or TV set while not in use can help reduce ____. a. noise b. air c. water d. all of the above *
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B
C
D
10. Temporary loss of hearing after exposure to sound is? A. auditory fatigue B.deafness C. occupational HL D. all of the above *
A
B
C
D
11. It is the action or process of making land, water, air, etc., dirty and not safe or suitable touse. a. rodents b. Pets c. Pollution d. Transmission *
A
B
C
D
12. Noise can affect sleeping patterns leading to irritability, fatigue and lack of sleep making youless efficient in school and work. a. deafness b. Loss of efficiency c. Auditory fatigue d. Trouble in speech *
A
B
C
D
13. Can raise your blood pressure and heart rate that may cause cardiovascular diseases. a. deafness b. Loss of efficiency c. Auditory fatigue d. Physical disorder *
A
B
C
D
14. Deafness is cause by: a. non-auditory problem b. auditory problem c. auditory fatigue D. none of the above *
A
B
C
D
15. Planting tree can help reduce noise by absorbing____a. air b. sound c. water d. oxygen *
A
B
C
D
16. Most often overlooked pollution a. air b. noise c. water d. none of the above *
A
B
C
D
17. Decibel is a unit used to measure the intensity of a sound. What is the symble of decibel? a. Hz b. dB c. HL d. none of the above *
A
B
C
D
18. Hertz is a unit of frequency, the symble is ______? a. Hz b. dB c. HL d. none of the above *
A
B
C
D
19. Occupational HL is gradual hearing loss, what is HL?a. Hertz b. decibel c. Hearing Loss d. none of the above *
A
B
C
D
20. We can control sources of noise, what noise is uncotrolable? a. thunder b. radio c. televison d. noise outside *
A
B
C
D