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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Q. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

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Q. Main pollutant present in automobile exhaust is

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Q. Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.

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Q. Industrial workers working in leather tanning & manufacturing units are prone to suffer from

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Q. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.

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Q. __________ can not control the noise pollution.

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Q. Ozone level is generally found to be depleted in India in the month of

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Q. Noise level during normal conversation among men is about __________ decibles.

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