Subject :NSO Class : Class 6
Subject :NSO Class : Class 5
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 3
Ans 1:
Class : Class 3
At most dust is stuck on the sticky surface of tape 'Y', it indicates that this tape was exposed to air at a location having the maximum level of air pollution. This prooves that the correct answer is option 'b'.
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Subject :NSO Class : Class 4
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Subject :NSO Class : Class 4
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 8