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UPSC Civil Service Exam Questions - Engineering

Q1:

In the set up shown in the above figure, assuming the specific weight of water as 10, 000 N/m3, the pressure difference between the points A and B will be

A 10 N/m2

B - 10 N/m2

C 20 N/m2

D -20 N/m2

ANS:B - - 10 N/m2

Pressure due to water=10000*1*0.05 = 500,
Pressure due to oil=10000*0.98*0.05 = 490,
Diff=490-500 = -10.
It is already a specific weight no need to multiply by 9.81.