Q. The lowest layer of atmosphere is known as the

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Q. As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m³.(μg-microgram)

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Q. Which of the following is not a weightless pollutant ?

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Q. In water treatment plant, zeolite process is used to remove the __________ of water.

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Q. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.

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Q. Fresh sewage is __________ in nature.

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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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