Properties Of Solids And Liquids Question 357

Question: If work done in increasing the size of a soap film from 10 cm×6 cm to 10 cm×11 cm is 2×10−4J, then the surface tension is [AIIMS 2000]

Options:

A) 2×10−2Nm−1

B)2×10−4Nm−1

C) 2×10−6Nm−1

D) 2×10−8Nm−1

Show Answer

Answer:

Correct Answer: A

Solution:

T=WΔA=2×10−42×(50×10−4)=2×10−2 N/m

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