TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?

Related Mcqs:

The term Biological Oxygen Demand (BOD) is used in relation to ______________________?

A. Potable water B. Cooling water C. Distilled water D. Industrial effluents...

Which of the following is the most widely used disinfectant in water treatment ?

A. Chlorine B. Irradiation of water by ultraviolet light C. Cation exchanger D. Coagulation...

World environment day is observed every year on the 5th of___________________?

A. June B. December C. July D. September...

In a sedimentation tank, the detention period for water ranges from _____________ hours?

A. 2 to 4 B. 8 to 12 C. 16 to 20 D. 24 to 32...

Pick out the wrong statement ?

A. The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone B. Mesosphere is characterised by very low atmospheric pressure and low temperature C. Troposphere is a dusty zone containing water vapor and clouds D. The radio waves used in the long distance radio communication are reflected back to earth … Pick out the wrong statement ?Read More...