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UPSC Civil Service Exam Questions - Engineering

Q1:

Mercury (density = 13600 kg/m3, σ = 0.49N/mm internal diameter open-ended capillary tube is inserted in the middle of the beaker into the mercury. The meniscus in the tube will be below the external mercury surface by how much distance?

A 4.2 m

B 5.7 m

C 6.8 m

D 7.3 m

ANS:D - 7.3 m

Capillary rise (H) = (2*0.49) *10^2/13.6*9.81=7.3 mm.