The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is

π w ω² r² / 4g

π w ω² r³ / 4g

π w ω² r⁴ / 4g

π w ω² r² / 2g

Correct Answer : Option (C) : π w ω² r⁴ / 4g

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Free surface of a liquid tends to contract to the smallest possible area due to force of

Friction

Surface tension

Viscosity

Cohesion

Correct Answer : Surface tension

Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

Kaplan turbine

Pelton wheel

Francis turbine

None of the above

Correct Answer : Francis turbine

If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its

Specific mass

Specific gravity

Specific weight

Specific density

Correct Answer : Specific gravity