Removal of __________ results from the disinfection of water. Odour Turbidity Bacteria Hardness TRUE ANSWER : ? YOUR ANSWER : ?
The permissible color for domestic water supply is __________ ppm. 100 1 20 1000 TRUE ANSWER : ? YOUR ANSWER : ?
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. 4000 100 400 1000 TRUE ANSWER : ? YOUR ANSWER : ?
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels. 120 25 80 50 TRUE ANSWER : ? YOUR ANSWER : ?
Which is the most widely used coagulant for the treatment of turbid water? Alum (aluminium sulphate) Lime Ferric chloride Sodium aluminate TRUE ANSWER : ? YOUR ANSWER : ?
TLV of mercury in potable (drinking) water is about __________ ppm. 5 1 0.1 0.001 TRUE ANSWER : ? YOUR ANSWER : ?
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause Corrosion Non biodegradable foam Undesirable plant growth Explosion TRUE ANSWER : ? YOUR ANSWER : ?
Average human body contains about __________ percent water by weight. 70 85 20 40 TRUE ANSWER : ? YOUR ANSWER : ?
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm. 20 200 100 400 TRUE ANSWER : ? YOUR ANSWER : ?