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Class 11 Water in the Atmosphere worksheet
CBSE Social Science. Humidity, evaporation and condensation, dew, frost, fog and clouds, and the types and distribution of rainfall. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
Water vapour in the air varies from zero to about:
- 0.04 per cent by volume
- 78 per cent by volume
- 40 per cent by volume
- 4 per cent by volume
Answer
(d) 4 per cent by volume
- 2.
Which describes frost?
- fog mixed with smoke
- more moist than fog, visibility 1–2 km
- ice crystals on cold surfaces, with the dew point at or below freezing
- a cloud at the ground, visibility under 1 km
Answer
(c) ice crystals on cold surfaces, with the dew point at or below freezing
- 3.
Which describes cirrus clouds?
- layered clouds covering large parts of the sky
- cotton-wool clouds with flat bases at 4,000–7,000 m
- thin, feathery white clouds at 8,000–12,000 m
- ice crystals lying on the ground
Answer
(c) thin, feathery white clouds at 8,000–12,000 m
Section B · short answer
- 4.
Distinguish between absolute and relative humidity.
Answer
Absolute humidity is the weight of water vapour per unit volume of air; relative humidity is the percentage of moisture present compared with the air’s full capacity at that temperature.
- 5.
Describe each form of condensation: (a) mist (b) fog
Answer
(a) more moist than fog, visibility 1–2 km (b) a cloud at the ground, visibility under 1 km
Section C · long answer
- 6.
Describe the forms of condensation.
Answer
Dew on cool surfaces above freezing; frost as ice crystals below freezing; fog and mist as cloud near the ground; and clouds in the free air.
Fresh sheets for your child
In the app, every Water in the Atmosphere sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.