Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?

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The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?

A. 20 B. 230 C. 750 D. 1500...

Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?

A. Thermosphere B. Troposphere C. Stratosphere D. None of these...

Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________________?

A. Gravity settling chamber B. Cyclone separator C. Electrostatic precipitator D. Bag filter...

Pick out the wrong statement. A. Caustic embrittlement of boiler’s metallic parts is caused by high concentration of caustic soda in boiler feed water___________________?

B. Cooling and freezing of water kills the bacteria present in it C. With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing D. Dissolved oxygen content in high pressure boiler feed water should be nil...

Radioactive solid nuclear wastes are disposed off by _________________?

A. High temperature incineration B. Pathological incineration C. Pyrolysis D. Underground burial in concrete containers...