Air

Air - NCERT Guide Geography Class 7

Q1: Answer the following questions.
  1. What is Atmosphere?
  2. Which two gases make the bulk of atmosphere?
  3. Which gas creates Green House effect in atmosphere?
  4. What is Weather?
  5. Name three types of Rainfall.
  6. What is Air Pressure?
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Q2: Tick the correct answer.

(i) Which of the following gases protects us from harmful sun rays?

  1. Carbon Dioxide
  2. Nitrogen
  3. Ozone

(ii) The most important layer of atmosphere is

  1. Troposphere
  2. Thermosphere
  3. Mesosphere

(iii) Which of the following layers of atmosphere is free from clouds?

  1. Troposphere
  2. Stratosphere
  3. Mesosphere

(iv) As we go up the layer of the atmosphere, the pressure

  1. Increases
  2. Decreases
  3. Remains same.

(v) When precipitation comes down to the earth in the liquid form, it is called -

  1. Cloud
  2. Rain
  3. Snow
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Q3: Match the items in column I with those in column II:

Column I Column II
  1. Trade winds
  2. Loo
  3. Monsoon
  4. Wind
  1. Seasonal wind
  2. Horizontal movement of air
  3. Permanent wind
  4. Local wind
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Q4:Give reasons:
  1. Wet clothes take longer time to dry on a humid day.
  2. Amount of insolation decreases from equator towards poles.
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