Properties Of Solids And Liquids Question 337

Question: The surface tension of a liquid is 5 N/m.If a thin film of the area 0.02 m2 is formed on a loop, then its surface energy will be [CPMT 1977; MP PET 1989; BCECE 2005]

Options:

A) 5×102J

B)2.5×102J

C) 2×101J

D)5×101J

Show Answer

Answer:

Correct Answer: C

Solution:

W=T×ΔA=5×2×(0.02) (Film has two free surfaces) =2×101J



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