Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?

Related Mcqs:

Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about ______________ ppm?

A. < 1 B. 10-100 C. 100-200 D. 100-1000...

White smoke coming out of the chimney of a furnace indicates the use of_________________?

A. Low excess air B. Very high excess air C. Gaseous fuel in the furnace D. Liquid fuel in the furnace...

Maximum permissible turbidity in potable water is _____________ ppm?

A. 1 B. 10 C. 250 D. 1000...

In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?

A. 1 to 2 B. 4 to 5 C. 9 to 10 D. 15 to 20...

Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?

A. Natural aeration of water stream B. Photosynthetic action of algae C. Both A. & B. D. Neither A. nor B....