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Physics-Surface Tension

NEET Physics Surface Tension MCQ Question

Type: MCQ-numerical-Hard-Class 11

A U-shaped wire is dipped in a soap solution and removed. A thin soap film forms between the wire and a light slider, supporting a weight of 1.5 × 10^–2 N. If the length of the slider is 30 cm, calculate the surface tension of the film.

A

0.025 N/m

B

0.050 N/m

C

0.075 N/m

D

0.100 N/m

Correct Answer

Option B

Detailed Explanation

The surface tension S is given by S = F/(2l), where F is the force and l is the length of the slider. Substituting F = 1.5 × 10^–2 N and l = 0.3 m, we get S = 0.050 N/m.

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