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Atmosphere and Climate: CBSE Class 9 Geography practice questions

Practise 50 questions on Atmosphere and Climate, free, with an explanation for each answer.

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Sample questions

Which part of the atmosphere changes in amount? It is usually between 0.1 and 0.4 per cent of the air, and it plays a big role in forming clouds and precipitation.

A jar of air filled with moving gas molecules
  1. Argon
  2. Carbon dioxide
  3. Nitrogen
  4. Water vapour
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D. Water vapour

Water vapour usually makes up about 0.1–0.4 per cent of the atmosphere, but the amount changes from place to place and day to day. When it condenses it forms clouds and precipitation. Nitrogen and argon stay almost constant, and carbon dioxide is only about 0.04%.

A large jar holds 500 litres of dry air. Using the composition of the atmosphere, about how much of this air is nitrogen?

A jar labelled 500 L filled with moving gas molecules of different colours
  1. 78 L
  2. 105 L
  3. 390 L
  4. 39 L
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C. 390 L

Nitrogen is about 78% of air: 78100×500=390 L\dfrac{78}{100} \times 500 = 390\ \text{L} 78 L just copies the percentage, 105 L is 21% (that is oxygen), and 39 L comes from dividing by 1000 instead of 100.

Mumbai receives 183.4 cm of rain a year. About what percentage of it falls in the four monsoon months, June to September?

Bar graph of Mumbai's monthly rainfall with the four largest bars labelled
  1. About 61%
  2. About 4%
  3. About 24%
  4. About 96%
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D. About 96%

June–September =50.6+61.0+36.9+26.9=175.4 cm= 50.6 + 61.0 + 36.9 + 26.9 = 175.4\ \text{cm}. 175.4183.4×100≈96%\dfrac{175.4}{183.4} \times 100 \approx 96\% 61% uses only June and July, 4% is the share of the other eight months, and 24% comes from using the monthly average instead of the total.

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