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UPSC Civil Service Exam Questions - Engineering

Q1:

Which one of the following pressure units represents the LEAST pressure ?

A Millibar

B mm of mercury

C N/mm2

D kgf/cm2

ANS:A - Millibar

Explanation:

1 atm= 10.1m of water,
=760mm of Hg,
=1013milibar,
=1.013kgfcm^2,
=0.1013Nmm^2(MPa).

So, option A is considered the right one.

1millibar = 1/1013atm.
1mm of Hg = 1/760atm.
1N/mm^2 = 1/0.1013atm.
1kgf/cm^2 = 1/1.013atm.