Q1 of 8 Page 74

Multiple choice question.

Sea salt, pollen, ash, smoke soot, fine soil — these are associated with:


Sea salts, pollen, ash, smoke soot, fine soil together form the dust particles. They are very small and accumulate to form dust.

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1

Multiple choice question.

Which one of the following gases constitutes the major portion of the atmosphere?


 1 B

Multiple choice question.

Atmospheric layer important for human beings is:


 1

Multiple choice question.

Oxygen gas is in negligible quantity at the height of atmosphere:


 1

Multiple choice question.

Which one of the following gases is transparent to incoming solar radiation and opaque to outgoing terrestrial radiation?