A closed cylindrical tube containing some water (not filling the entire tube) lies in a horizontal plane.

Monjur Alahi

A closed cylindrical tube containing some water (not filling the entire tube) lies in a horizontal plane. If the tube is rotated about a perpendicular bisector, the moment of inertia of water about the axis

(a) increases

(b) decreases

(c) remains constant

(d) increases if the rotation is clockwise and decreases if it is anticlockwise


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Salim Ahmed Kawsar

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(a) increases

Explanation: 

During the above rotation water will move away from the axis of rotation. And the moment of inertia is directly proportional to the square of the distance of the mass from the axis of rotation. Hence the option (a).

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