Q. Pick out the correct statement.

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Q. Which of the following is not a source of ozone emission in the atmosphere ?

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Q. Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the

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Q. Pick out the correct statement.

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Q. The upper layer of atmosphere is called the

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Q. Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

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Q. Fine grit present in sewage is removed in the __________ during sewage treatment.

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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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