Q. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called

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Q. A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

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Q. Insufficient washing of sand grains in a rapid sand filter causes

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Q. Which of the following sources is responsible for maximum air pollution ?

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Q. Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?

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Q. In sewage treatment, its sedimentation is speeded up by commonly adding

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Q. Noise level in a quiet private business office is about __________ decibels.

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Q. White smoke coming out of the chimney of a furnace indicates the use of

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Q. TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes

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Q. Sulphur dioxide present in the industrial chimney exhaust gases causes

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Q. A man exposed to excessive noise level in the working environment may suffer from

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Q. Which of the following is a secondary air pollutant ?

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

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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. 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. 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. Fresh domestic sewage is __________ in color.

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

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

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Q. The maximum CO₂ is emitted into the atmosphere by

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