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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Q. Presence of soluble organics in polluted water causes

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Q. Which of the following pollutants, if present in atmosphere is detectable by its odour ?

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Q. Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.

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Q. Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes

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Q. Nitrogen oxides (NOₓ) is not produced in the __________ industry.

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Q. World's worst radioactive pollution was caused by nuclear reactor disaster which occured in

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Q. Dissolved oxygen content in river water is around __________ ppm.

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Q. What are the methods of treatment & disposal of radioactive wastes ?

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