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Question

Which process is responsible for the rising of warm air over a heated surface?

This question was previously asked in
RRB NTPC 2025 Under Graduate CBT 2 Question Paper PDF (17-Sep-2026) (Shift 1)
The correct answer is

Convection

Convection is the process responsible for the rising of warm air over a heated surface, as heated air becomes less dense and rises.

Radiation transfers heat without a medium, Conduction transfers heat through direct contact, and Insulation resists heat transfer — none describe rising warm air.

Hence, Convection is the correct answer.

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