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9.2 , surface tension — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.2 , surface tension1 Mark
MCQ
A thread is tied slightly loose to a wire frame as in figure and the frame is dipped into a soap solution and taken out. The frame is completely covered with the film. When the portion $A$ punctured with a pin, the thread.
  • ✓
    Becomes concave toward $A$
  • B
    Becomes convex towards $A$
  • C
    Remains in the initial position
  • D
    Either $(a)$ or $(b)$ depending on the size of $A$ w.r.t. $B$
✓

Answer

Correct option: A.
Becomes concave toward $A$
a
(a) Because film tries to cover minimum surface area.

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