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21. The surface tension of liquid is 0.5 N/m. If a film is held on a

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

(a) 5 × 10-2 joule                            

(b)  2.0 × 10-2 joule

(c)  4 × 10-4 joule                    

(d)  0.8 × 10-1 joule

Ans. b

(5)

5/5 - (3 votes)

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