Noise Pollution MCQ – Environmental Engineering

21. What is the maximum noise level that 1s permissible in a library?

1. 46 dB to 50 dB
2. 51 dB to 55 dB
3. 45 dB
4. 40 dB

22. Permitted noise levels (in decibels) for residential zones in day time and night time are ________ and __________ respectively.

1. 65 dB, 55 dB
2. 40 dB, 35 dB
3. 50 dB, 40 dB
4. 55 dB, 45 dB

23. As per Environmental Protection Act, 1986, the noise level in the industrial area during day should not be more than

1. 65 dB
2. 75 dB
3. 55 dB
4. 45 dB

24. What is the threshold of audibility in decibel?

1. 40
2. 0
3. 92
4. 66

25. The reference pressure used in the determination for sound/pressure level is

1. 10 dB
2. 10 μPa
3. 20 dB
4. 20 μPa

26. For a residential area, the permissible L_eq (time weighted average of the level of sound in decibels on scale A during the night time) is

1. 35
2. 45
3. 55
4. 65

27. The State Governments have categorized the areas into how many types or zones for the purpose of implementation of noise standards?

1. 4
2. 3
3. 6
4. 5

28. As per the Noise Pollution (Regulation and Control) Amendment Rules, 2017, the State Government may permit use of loud speakers or public address systems and the like during night hours (between 10.00 p.m. and 12.00
midnight) on or during any cultural, religious or festive occasion of limited duration not exceeding __________ days in all during a calendar year.

1. 15
2. 10
3. 25
4. 20

29. An area comprising not less than ________ metres around hospitals, educational institutions and courts may be declared as silence area/zone.

1. 100
2. 50
3. 250
4. 500

30. A person can make a complainant to the competent authority if the noise levels exceeds the ambient noise levels by

1. 10 dB
2. 20 dB
3. 30 dB
4. 40 dB