Same chapter3 marksDifficulty: Medium
State Stokes' law and define terminal velocity.
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3 marksDifficulty: Medium
What is surface tension and why do small liquid drops take a spherical shape?
Original Khojo Papers practice question — not from a past board paper.
Answer
Surface tension is the force per unit length acting at right angles to a line drawn in the surface of a liquid, arising from the unbalanced attraction on the molecules at the surface. A sphere has the least surface area for a given volume, and surface tension makes the surface contract as far as it can, so a small drop becomes spherical.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Large drops are flattened by gravity, which then outweighs surface tension.
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