Q. In a sedimentation tank, the detention period for water ranges from __________ hours.

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Q. On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

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Q. The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the

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Q. Arsenic pollutant is not generated in____industries.

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Q. The resistance of water to the passage of light through it is a measure of the

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Q. Color test of water is done with an instrument called

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Q. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas ?

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Q. Aerosols present in atmospheric air may be

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Q. Ethanolamine is an absorbant used for the removal of __________ from air/gas.

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Q. Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?

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Q. __________ plant emits large amount of SO₂ as an air pollutant.

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Q. Noise pollution level in a chemical plant is expressed in

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Q. Global warming may result in

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Q. Which of the following is the most lethal water pollutant ?

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Q. Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)

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Q. The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.

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Q. Which of the following is an adsorbant used for the removal of SO₂ from gas/air ?

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Q. Which of the following is the most widely used disinfectant in water treatment ?

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Q. Pick out the wrong statement

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Q. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by

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