Noise level in a quiet private business office is about _____________ decibels?

Related Mcqs:

High noise levels produced during operation of fans and compressors can be reduced by using__________________?

A. Mufflers (silencers) B. Acoustic absorbent C. Lagging of noisy duct D. None of these...

Beyond what concentration of H2S in air, acute danger to human life exists ?

A. 50 ppm B. 100 ppm C. 300 ppm D. 700 ppm...

‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?

A. Industrial chimney exhaust B. Automobiles exhaust C. Photochemical reaction in polluted atmosphere D. Burning of domestic fuel...

Hazardous/polluting chemical industries should have an ‘exclusion zone’ with a green belt and general public access prohibited around it, covering a radius of _____________ metres?

A. 100 B. 1000 C. 400 D. 4000...

Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called________________?

A. Thermosphere B. Stratosphere C. Troposphere D. Mesosphere...