Q. There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

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Q. Brown spots in fabrics will be caused by washing with water containing large amount of .

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Q. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μg)/litre.

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Q. Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.

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Q. If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.

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Q. Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes

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Q. Pick out the wrong statement.

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Q. Radioactive solid nuclear wastes are disposed off by

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Q. Growth of __________ is promoted by the presence of manganese in water.

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Q. Average human body contains about __________ percent water by weight.

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