Noise emitted by a ventilation fan at a distance of 3 metres is about _________

Question

Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

Options:

A . 85

B . 105

C . 125

D . 145

Answer: Option B

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More Questions on This Topic :

Question 1. Noise level in a quiet private business office is about __________ decibels.....

Question 2. Noise level during normal conversation among men is about __________ decibles.....

Question 3. A standard test for determination of hardness in water is termed as __________ test.....

Question 4. TLV of aldrin in public water supply system is about __________ μg/litre.....

Question 5. Which of the following is the most lethal water pollutant?....

Question 6. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ ....blast furnace and coal mining industries contain mainly __________ substances.

Question 7. Operating principle of cyclone separator is based on the action of __________ dust particles.....

Question 8. Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.....

Question 9. Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.....

Question 10. COD of raw municipal sewage may be in the range of about __________ mg/litre.....

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