Q. TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

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Q. Corrosion in boilers can be prevented by

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Q. Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

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Q. Lagoons used for purification of polluted water

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Q. The principal gas evolved from sludge digestion tank is

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Q. There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?

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Q. The function of skimming tank in sewage treatment is to remove __________ substances.

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Q. Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes

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Q. Deaeration of high pressure boiler feed water is done to reduce

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Q. Exposure to SO₂ containing chimney gases results in the

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Q. The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.

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Q. Hydrogen ion concentration in distilled water is

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Q. Removal of __________ results from the disinfection of water.

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Q. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?

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Q. Carcinogenic air pollutants cause

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Q. Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes

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Q. Soluble silica present in boiler feed water can be removed by

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Q. The common pollutant generated in chlor-alkali industry and battery manufacture is

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Q. During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.

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Q. Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

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