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Physics-Surface Tension

NEET Physics Surface Tension MCQ Question

Type: MCQ-numerical-Easy-Class 11

A U-shaped wire is dipped in a soap solution and removed, forming a thin soap film. If this film supports a weight of 1.5 × 10 –2 N and the length of the slider is 30 cm, what is the surface tension of the film?

A

0.025 N/m

B

0.050 N/m

C

0.075 N/m

D

0.030 N/m

Correct Answer

Option A

Detailed Explanation

Surface tension (S) is calculated using S = force / (length × 2) as there are two surfaces in the film. Here, S = (1.5 × 10 –2 N) / (0.30 m × 2) = 0.025 N/m.

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