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Question

Which of the following processes is primarily responsible for heat loss from a hot utensil?

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

Radiation

The correct answer is Radiation.

While all three processes (conduction, convection, and radiation) contribute to heat loss to some extent, radiation is the primary mechanism by which a hot utensil loses heat. Let's examine each process:

  • Conduction: This involves the transfer of heat through direct contact. Heat from the utensil would transfer to the surface it's in contact with (e.g., a countertop). This is significant but not the dominant method for heat loss to the surrounding environment.
  • Convection: This involves heat transfer through the movement of fluids (liquids or gases). While air currents around a hot utensil will carry away some heat, this process is less efficient than radiation in this scenario.
  • Radiation: This is the emission of electromagnetic waves carrying heat energy. A hot utensil emits infrared radiation, which travels directly through the air and carries away a significant portion of its heat. This is the dominant mechanism for heat loss, especially to cooler surroundings.
  • Absorption: Absorption is the process of absorbing energy, rather than losing energy. This isn't a method of heat loss from the utensil itself.

Therefore, radiation is the primary mechanism responsible for the heat loss from a hot utensil.

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