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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Q. 'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a 'particulate' ?

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Q. Pick out the wrong statement.

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Q. Peroxyacyl nitrate (PAN), a pollutant is found in the

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Q. Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.

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Q. Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

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Q. Pick out the wrong statement.

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Q. Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the

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Q. Which of the following is not a secondary air pollutant ?

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Q. The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent.

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Q. The main industrial source of emission of hydrogen sulphide air pollutant is

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