The process of heat transfer by actual movement of fluid particles is called:
A. Conduction
B. Radiation
C. Convection
D. Advection
Answer: Option C
Solution (By JKSSB Mock Tests)
Convection involves heat transfer by bulk movement of fluid (liquid or gas), carrying thermal energy. Natural convection: density differences drive flow; forced convection: external means (fan, pump). Conduction: molecular collisions without bulk motion; radiation: EM waves. Memory aid: 'Convection = fluid motion carries heat; e.g., boiling water, weather systems'. This definition question tests thermodynamics fundamentals, frequently examined in competitive exams. Always distinguish convection (requires fluid) from conduction (solids/fluids) and radiation (no medium needed).
Explanation:
Acceleration phase: s₁ = ½a t² = ½×2×100 = 100 m, v = a t = 20 m/s. Constant velocity phase: s₂ = v×t = 20×10 = 200 m. Total = 300 m. Motion in two parts.
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