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HomePhysics27. The work done in increasing the size of a soap film from

27. The work done in increasing the size of a soap film from

10 cm× 6 cm to 10 cm × 11 cm is 3 ×10-4 joule. The surface tension of the film is  

(a) 1.5 x 10-2N/m

(b) 3.0 x 10-2N/m

(c)  6.0 x  10-2N/m

(d)  11 x 10-2N/m

Ans. b

(6)

5/5 - (1 vote)

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12. An ideal gas is taken through the cycle A→ B → C → A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is

(a)      – 5 J (b)  – 10 J (c)   – 15 J (d)  – 20 J Answer-a (126)

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