Convection is the transfer of heat
AThrough a perfectly empty space
BBy vibration of fixed solid particles
CBy electromagnetic waves in vacuum
DBy bulk movement of heated fluid particles
Answer & Solution
Correct answer: D. By bulk movement of heated fluid particles
1. Convection happens in liquids and gases.
2. Hot fluid particles become less dense and rise.
3. Cool denser fluid sinks to replace them.
4. This bulk movement carries the heat.
_Source: Selina Concise Physics Class 8, Ch 5 Heat (Mistral OCR'd PDF), section on convection_
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