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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Q. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.

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Q. A shallow pond in which the sewage is retained and biologically treated is called

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Q. Which is the most practical and economical method for removal of suspended solid matter from polluted water ?

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Q. Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called

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Q. Iron & manganese present in the polluted water is removed by

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Q. Water effluent generated in printing industry is decolourised by

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Q. Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

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Q. The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.

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Q. Particles having diameter greater than 75 μm (micrometer = 10⁻⁶ mm) are called

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