Atmospheric Pressure

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  • Q1

    If the surface air pressure is 1,000 mb, the air pressure at 1 km above the surface will be

    Marks:1
    Answer:

    900 mb.

    Explanation:
    In the lower atmosphere, the pressure decreases rapidly with height. The decrease amounts to about 1 mb for each 10 m increase in elevation.
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  • Q2

    Air pressure is measured with the help of a

    Marks:1
    Answer:

    Barometer.

    Explanation:
    A barometer is an instrument used to measure atmospheric pressure. It can measure the pressure exerted by the atmosphere by using water, air, or mercury.
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  • Q3

    A wind circulation around a low pressure centre is called

    Marks:1
    Answer:

    a cyclone.

    Explanation:
    A cyclone is a storm system characterized by a large low-pressure centre and numerous thunderstorms that produce strong winds and heavy rains. Cyclones feed on heat released when moist air rises, resulting in condensation of water vapour contained in the moist air.
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  • Q4

    The vertical pressure gradient force is much ----- than that of the horizontal pressure gradient.

    Marks:1
    Answer:

    Larger

    Explanation:

    It is generally balanced by a nearly equal but opposite gravitational force.

     

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  • Q5

    Horizontal distribution of pressure is studied by drawing

    Marks:1
    Answer:

    isobars.

    Explanation:
    Isobars are lines connecting places having equal pressure.
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