Q. TLV of mercury in potable (drinking) water is about __________ ppm.

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Q. 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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Q. Which is a secondary air pollutant ?

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Q. Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by

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Q. Persons working in cement plants and limestone quarries are more prone to disease like

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Q. Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called

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Q. Operating principle of cyclone separator is based on the action of __________ dust particles.

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Q. Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.

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Q. Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).

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Q. Tolerable limit of nitrogen oxides in air is __________ ppm.

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Q. Iron & manganese present as pollutant in water can not be removed by

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Q. In water chemical treatment plant, use of chloramines ensures

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Q. Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?

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Q. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?

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Q. H₂S present in gaseous stream can be removed by adsorption on

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Q. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes

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Q. Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

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Q. Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to

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Q. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause

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Q. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

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