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Fluids And Pressure Test - 4

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Fluids And Pressure Test - 4
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  • Question 1
    1 / -0

    The principle of operation of a Brahma's press is based on

    Solution

    It is a hydraulic press and hence is based on Pascal`s law.

     

  • Question 2
    1 / -0

    When cooking oil is heated in a frying pan, the oil moves around in the pan more easily, when it is hot. The main reason for this is that with rise in temperature, there is a decrease in

    Solution

    With the rise in temperature, there is a decrease in the viscosity of a fluid. Hence, the oil moves freely when it is hot because it is less viscous.

     

  • Question 3
    1 / -0

    As a bubble comes from the bottom of a lake to the top, its radius

    Solution

    As a bubble comes from the bottom of a lake to the top, its radius increases because the pressure exerted by the water in the lake decreases as the bubble moves up.

     

  • Question 4
    1 / -0

    The ratio of the diameters of an air bubble at the bottom and at the surface is 1:2.If 1 atmosphere is equal to pressure of 10 m long water column,then what is the depth of the lake?

    Solution

    When the diameter doubles,radius doubles.Volume increases by factor of 8.(h+10)V = 10 * 8 Vh = 80 - 10 = 70 m

     

  • Question 5
    1 / -0

    The force of cohesion is the greatest in

    Solution

    Solids have maximum force of cohesion as compared to the liquids and gases.

     

  • Question 6
    1 / -0

    Two glass plates are put together with a few drops of water between them. Then it becomes difficult to separate the two by pulling in opposite direction on account of

    Solution

    Surface tension makes it hard to separate the two glass plates in which some drops of water are put.

     

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