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UPSC Civil Service Exam Questions - Engineering

Q1:

Surface tension of water when in contact with air is 0.0737 N/m. The difference of pressure between the inside and outside of a droplet of rain water 1 mm in diameter is nearly equal to

A 0.15 kN/m2

B 0.20 kN/m2

C 0.25 kN/m2

D 0.30 kN/m2

ANS:D - 0.30 kN/m2

1): P=4*sigma/d.
2): 8 * sigma/ d.
Put values in both formulas and then subtract the result of both to get the answer.