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

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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. 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. Reingleman chart is used for the evaluation of __________ pollution.

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Q. Beyond what concentration of H₂S in air, acute danger to human life exists ?

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Q. Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas ?

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Q. Which of the following is a manmade source of air pollution ?

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Q. Reingleman chart No. 2 corresponds to __________ percent black smoke.

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Q. __________ is the process of killing organism in water.

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Q. Smog is

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Q. Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.

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Q. Which of the following is not a practical method of low level radioactive waste disposal ?

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Q. The maximum CO₂ is emitted into the atmosphere by

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Q. Which of the following plants does not emit appreciable amount of SO₂ in atmosphere ?

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Q. Out of the following, TLV of __________ is maximum (about 500 ppm).

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Q. Fresh domestic sewage is __________ in color.

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Q. A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

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Q. Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?

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Q. CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.

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Q. Presence of __________ bacteria in water causes disease like typhoid.

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