Noise emitted by a ventilation fan at a distance of 3 metres is about _____________ decibels?

Related Mcqs:

Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre?

A. 22 B. 42 C. 332 D. 1050...

Black smoke coming out of the chimney of a furnace is an indication of the use of ______________ in the furnace?

A. Low amount of excess combustion air B. Large quantity of excess combustion air C. Hydrocarbon fuel D. Pulverised coal as fuel...

Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?

A. Lagooning B. Activated carbon adsorption C. Biological oxidation pond D. Chemical coagulation...

Siderosis is a disease caused by the inhalation of ______________ dust?

A. Coal B. Silica C. Iron D. None of these...

Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?

A. Mercury B. Lead C. Fluoride D. Arsenic...