Noise level during normal conversation among men is about ______________ decibels?

Related Mcqs:

There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?

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

Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?

A. Chemical coagulation B. Floatation & skimming C. Centrifugation D. Ultra filtration...

Presence of _____________ bacteria in water causes disease like typhoid?

A. Aerobic B. Pathogenic C. Anaerobic D. Non-pathogenic...

Dust collection efficiency of a cyclone separator depends upon its______________?

A. Diameter B. Inlet gas velocity C. Overall height D. All A., B. & C....

Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________________?

A. Blood poisoning B. Anaemia C. Nervous system disorder D. All A., B. & C....