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Question
An open circular cylindrical tank is filled with a liquid to its top level. It is rotated about its vertical axis at such a speed that half the liquid spills out. Then the pressure at the point of intersection of the axis and the bottom is
A.
One-fourth the value when the cylinder was full
B.
One-half the value when the cylinder was full
C.
Same as before rotation
D.
Equal to the atmospheric pressure
Answer ( Option D)

Equal to the atmospheric pressure

Solution

Spilled out volume = Half the liquid 
                                                     
When cylinder is rotated,
Spilled out volume = Shaded portion of cylinder = 
                                                                 
It means liquid surface just touches the bottom of cylinder that means there is atmospheric pressure       

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