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A steel blade placed gently on the surfa...

A steel blade placed gently on the surface of water floats on it. If the same blade is kept well inside the water, it sinks. Explain.

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Knowledge Check

  • A iron needle slowly placed on the surface of water floats on it because

    A
    when inside water, it will displace water more than its weight
    B
    the density of the material of the needle is less than that of water,
    C
    its surface tension
    D
    of its shape

  • Statement I: A needle placed carefully on the surface of water may float, whereas the ball of the same material will always sink. Statement II: The buoyancy of an object depends both on the material and shape of the object.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true and reason is false.
    D
    If both assertion and reason are false.

  • A point source of light is placed at a depth of h below the surface of water of refractive index mu . A floating opaque disc is placed on the surface of water so that light from the source is not visible from the surface. The minimum diameter of the disc is

    A
    `(2h)/((mu^(2) - 1)^(1//2))`
    B
    `2h(mu^(2)-1)^(1//2)`
    C
    `(h)/(2(mu^(2)-1)^(1//2))`
    D
    `h(mu^(2)-1)^(1//2)`

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