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Winds Storms and Cyclones Test - 18

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Winds Storms and Cyclones Test - 18
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  • Question 1
    1 / -0
    When warm air rises at a place, what happens to the air pressure there?
    Solution
    When hot air rises from an area, a region of space is left with no air hence air pressure decreases there due to less air molecules.So a region of low pressure is created.And cooler air from horizontal side flow here creating again high pressure region due to lot of air molecules.
  • Question 2
    1 / -0
    What is the principle behind the working of hot air balloons?

    Solution
    Hot air balloons work on the principle that hot air rises fast, because it is lighter compared to cold air. By heating the air inside the balloon with the burner, it becomes lighter than the cooler air on the outside. This causes the balloon to rises upwards.
  • Question 3
    1 / -0
    Where should an exhaust fan in the kitchen window be set up?
    Solution
    Exhaust fans are used to expel excess smoke and heat being generated while cooking in the kitchen. As smoke and hot air rise up in the air fast, exhaust fan should be set up on the top part of the window.
  • Question 4
    1 / -0
    On heating the air it _________(expands/contracts) and becomes  _______(less/more) dense.
    Solution
    Air expands on heating because the particles of air on becoming warm, move away from each other and take up more space. So we can say that air on becoming hot occupies more space. Since the particles move away from each other, the air becomes less dense and lighter in weight.
  • Question 5
    1 / -0
    Hot air balloon rises up in the air because:
    Solution
    Hot air rises up because it is lighter than cold air. As the air inside the balloon is hotter than the air surrounding the balloon it rises up.
  • Question 6
    1 / -0
    Where should you place the air-conditioning unit to cool a room faster?
    Solution
    Hot air rises up and colder air settles down in a room. If AC is placed high on the wall, the cold air blown by AC will settle on the floor and relatively hotter air will rise up. This motion of air current cools the room faster. 
    Hence Option A
  • Question 7
    1 / -0
    Hot air rises because:
    Solution
    Hot air rises because it is less dense than cold air. Hot is lighter, and occupies more space than cold air.

  • Question 8
    1 / -0
    A balloon is attached to the neck of a boiling tube and placed in a cold bath. Which of the following would be observed in the setup after a while?
    Solution
    Air expands on heating and contracts on cooling. When the boiling tube is kept inside a cold bath, the air inside the boiling tube will contract and the balloon will defllate.
  • Question 9
    1 / -0
    The emissions from a burning incense stick are seen to rise up always. Why is it so?
    Solution
    Smoke from incense sticks consists of hot air. As hot air always rises up, the smoke is seen to rise up.
  • Question 10
    1 / -0
    A balloon  is fixed on the mouth of a bottle as shown in the image. What will be observed when the bottle is left in the sun for an hour?

    Solution
    When the bottle is kept in sunlight for an hour it heats up and the air inside the bottle expands. Thus the balloon will inflate.
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