Page No. 59
Which of the following is not a source of ozone emission in the atmosphere?
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Photochemical smog is formed from automobile exhaust ________________?
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Inhalation of silica dust by human being causes ___________________?
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The lowest layer of atmosphere is known as the_____________________?
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Carcinogenic air pollutants cause__________________?
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The resistance of water to the passage of light through it is a measure of the___________________?
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Polyvinyl chloride containers are not suitable for storing_________________?
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The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?
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Which of the following processes is involved in the biochemical treatment of sewage effluents ?
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