alleryA wet paint brush forms a fine tip when lifted from water. This is due to:
AFluid viscosity
BBuoyant force
CGravity alone
DSurface tension
Answer & Solution
Correct answer: D. Surface tension
1. The hairs do not cling when dry or when underwater.
2. Out of water the free surface pulls them together.
3. That pull is surface tension.
_Source: syllabus Physics Part II, Chapter 10, Mechanical Properties of Fluids._
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