Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called Smoke Powder Dust Grit TRUE ANSWER : ? YOUR ANSWER : ?
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels. 95 75 35 105 TRUE ANSWER : ? YOUR ANSWER : ?
In the context of the chemical process industries, the term BOD is normally associated with the Characterisation of liquid effluents Characterisation of solid wastes Organic concentration in gaseous effluents Characterisation of boiler feed water TRUE ANSWER : ? YOUR ANSWER : ?
Fresh domestic sewage is __________ in color. Red Dark brown Grey Black TRUE ANSWER : ? YOUR ANSWER : ?
TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes Bone disease Skin disorder Cancer Bronchitis TRUE ANSWER : ? YOUR ANSWER : ?
Lagooning process is mainly a means of the None of these Sludge disposal Reduction of excessive flow in sewers Biological treatment of wastes TRUE ANSWER : ? YOUR ANSWER : ?
BOD of raw municipal sewage may be in the range of about __________ mg/litre. 150-300 2000-3000 1-2 5-10 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following fine dust removal equipments is the most efficient? Scrubber Electrostatic precipitator Bag filter Cyclone separator TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream? Circular clarifier Chemical coagulation Mechanical flocculation Sedimentation tank TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following processes is involved in the biochemical treatment of sewage effluents? Oxidation Dehydration Reduction Fermentation TRUE ANSWER : ? YOUR ANSWER : ?