Properties Of Solids And Liquids Question 345

Question: The surface tension of liquid is 0.5 N/m. If a film is held on a ring of area 0.02 m2, its surface energy is [CPMT 1977]

Options:

A) $ 5\times {{10}^{-2}}joule $

B)$ 2.0\times {{10}^{-2}}joule $

C) $ 4\times {{10}^{-4}}joule $

D)$ 0.8\times {{10}^{-1}}joule $

Show Answer

Answer:

Correct Answer: B

Solution:

Surface energy = $ T\times \Delta A=0.5\times 2\times (0.02) $ = $ 2\times {{10}^{-2}}J $



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