Air - Worksheets

 CBSE Worksheet 01

Air

  1. All the weather phenomena like rainfall, fog and hailstorm occur in which layer

    1. Troposphere

    2. Stratosphere

    3. Thermosphere

    4. Mesosphere

  2. The most important layer of the atmosphere is

    1. Thermosphere

    2. Troposphere

    3. None of these

    4. Mesosphere

  3. Which gas is found in large quantity in air? 

    1. Oxygen

    2. Argon

    3. Nitrogen

    4. Hydrogen

  4. Precipitation that comes down to the earth in liquid form is called

    1. Water vapour

    2. Cyclone

    3. Snow

    4. Rain

  5. Which of the following is false regarding air pressure? 

    1. In areas where temperature is high, the air gets heated and rises. This creates a High-pressure area.

    2. Air pressure is defined as the pressure exerted by the weight of air on the earth's surface.

    3. Horizontally the distribution of air pressure is influenced by temperature of air at a given place.

    4. As we go up the layers of atmosphere, the pressure falls rapidly. The air pressure is highest at sea level and decreases with height.

  6. Match the items given in Column A correctly with those given in Column B.

    Column A

    1. Oxygen
    2. Nitrogen
    3. Carbon dioxide
    4. Rain, snow, sleet
    5. Hail uppermost layer
    6. Ideal for flying aeroplanes

    Column B

    1.  Precipitation
    2. Stratosphere
    3. 21 %
    4. 0.03%
    5. 78%
    6. Exosphere
  7. Fill in the blanks:

    Temperature in cities is much ________ than that of villages.

  8. State true or false:

    Our atmosphere is divided into five layers.

  9. Distinguish between weather and climate.

  10. What is the significance of greenhouse gas?

  11. Why jet planes flying in the sky leave a white trail behind them?

  12. How is carbon dioxide useful?

  13. How does air pressure get affected due to layers of the atmosphere?

CBSE Worksheet 01
Air

Solution

  1. (a) Troposphere Explanation: Troposphere is the nearest layer to the earth's surface. Its height is 13 km. Hence, all-weather phenomena like fog, hailstorm and rainfall occur in this layer. 
  2. (b) Troposphere Explanation: Troposphere
  3. (c) Nitrogen Explanation: By volume, dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere. Hence, Nitrogen gas is the most abundant in air.
  4. (d) Rain Explanation: Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then precipitated—that is, become heavy enough to fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth.
  5. (a) In areas where temperature is high, the air gets heated and rises. This creates a High-pressure area.
    Explanation: As the air gets heated up due to high temperature, the air molecules become more distant and the air rises. As a result, a void is created that leads to a low-pressure area, and air from high-pressure areas rushes to fill in the void. 

  6. (i)-(c), (ii)-(e), (iii)-(d), (iv)-(a), (v)-(f), (vi)-(b).

  7. higher
  8. True

  9. Weather is an hour-to-hour, day-to-day condition of the atmosphere. On the other hand, the average weather condition of a place for a longer period of time represents the climate of a place.

  10. Without the greenhouse gas the earth would have been too cold to live in.

  11.  Jet planes flying in the sky leave a white trail behind them because when the moisture from engines of jet planes condenses, we see the trail of this condensed moisture for some time. As soon as air movement disturbs the moisture, the trail disappears.

    1. Green plants use carbon dioxide to make their food and release oxygen.
    2. Humans or animals release carbon dioxide.
    3. The amount of carbon dioxide released by humans or animals seems to be equal to the amount used by the plants which make a perfect balance.
    4. However, the balance is upset by burning of fuels, like coal and oil. All this affects earth’s weather and climate.
    1. The pressure falls rapidly as we go up the layers of the atmosphere.
    2. The air pressure is highest at the sea level and decreases with height.
    3. Horizontally, the distribution of air pressure is influenced by temperature of air at a given place.
    4. In areas where temperature is high, the air gets heated and thus rises.
    5. This creates a low-pressure area, which leads to cloudy skies and wet weather.
    6. In areas with low temperature, air is cold and pressure is heavy.
    7. Heavy air sinks and creates a high-pressure area.
    8. High pressure is associated with clear and sunny skies.
    9. Air moves from high-pressure to low-pressure areas.