STANDARDPhysics-Properties of Fluids
STANDARD Physics Surface Tension MCQ Question
Type: MCQ-numerical-Medium-Class 11
The surface tension of soap solution at a temperature 20°C is 2.5 × 10⁻² N m⁻¹. The excess pressure inside a bubble of soap solution of radius 6 mm is
A
12.5 Pa
B
14.2 Pa
C
15.5 Pa
D
16.7 Pa
Correct Answer
Option D
Detailed Explanation
The excess pressure inside a soap bubble is given by P = 4S/r. Substituting S = 2.5 × 10⁻² N m⁻¹ and r = 6 × 10⁻³ m, we get P = 16.7 Pa.
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