Q1 of 8 Page 74

Multiple choice question.

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


The density of oxygen decreases with increase in height and so it will be in a negligible quantity at the height of 120 km from the earth’s surface.

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1 B

Multiple choice question.

Atmospheric layer important for human beings is:


 1

Multiple choice question.

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


 1

Multiple choice question.

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


 2

Answer the following questions in about 30 words.

(i) What do you understand by atmosphere?


(ii) What are the elements of weather and climate?


(iii) Describe the composition of atmosphere.


(iv) Why is troposphere the most important of all the layers of the atmosphere?