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At sea level, atmospheric pressure is...

At sea level, atmospheric pressure is

A

76 cm of Hg column

B

0.76 cm of Hg column

C

76 m of Hg column

D

76 cm of water column

Text Solution

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The correct Answer is:
A
76 cm of Hg column
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At a depth of 1000 m in an ocean (a) what is the absolute pressure? (b) what is the auge pressure? (c ) Find the force acting on the windown of area 20 cm xx 20cm of a submarine at this depth, the interior of which is maintained at sea-level atmospheric pressure. The density of sea water is 1.03 xx 10^(3) kg m^(-3) , g=10ms^(-2) . Atmospheric pressure = 1.01 xx 10^(5) Pa .

On the surface of earth, the atmospheric pressure is minimum at the sea-level.

Knowledge Check

  • At seal level, atmospheric pressure is:

    A
    760 cm of Hg
    B
    76 cm of Hg
    C
    0.76 cm of Hg
    D
    7.6 cm of Hg

  • Assertion : At high altitudes , liquids boil at lower temperatures in comparison to that at sea level . Reason : At high altitudes , atmospheric pressure is low .

    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 but reason is false .
    D
    If both assertion and reason are false .

  • Assertion : At high altitudes liquids boil at lower temperaturers in comparison to that of sea level. Reason : At high altitudes atmospheric pressure is low

    A
    Both assertion and reason are true and reason is the correct explanation of assertion
    B
    Both assertion and reason are true and reason is not the correct explanation of assertion
    C
    Assertion is true but reason is false
    D
    Both assertion and reason are false

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    A submarine has a window of area 30 xx 30 cm^(2) on its ceiling and is at a depth of 100m below sea level in a sea. If the pressure inside the submarine is maintained at the sea-level atmosphere pressure, then the force acting on the window is (consider density of sea water = 1.03 xx 10^(3) kg//m^(3) , acceleration due to gravity = 10 m//s^(2)

    The manual of a car instructs the owner to inflate the tyres to a pressure of 200 k pa. (a) What is the recommended gauge pressure ? (b) What is the recommended absolute pressure (c) if, after the required inflation of the tyres, the car is driven to a mountain peak where the atmospheric pressure is 10% below that at sea level, what will the tyre gauge read ?

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