Single correct · +4 / −1

The three fundamental modes of heat transfer are:

  1. (a) conduction, convection, radiation
  2. (b) convection only
  3. (c) radiation only
  4. (d) absorption, emission, reflection
Answer and solution

Answer (a) conduction, convection, radiation

Solution

Physics sir · 4 steps

Ask how the energy travels: through the material, with the moving fluid, or with no medium at all.

  1. Conduction. Heat passes from particle to particle inside a body while the particles stay in place. This is how the handle of a steel spoon in hot tea warms up.
  2. Convection. In a liquid or a gas, the warm part becomes less dense and rises, carrying its heat with it. The heat travels because the fluid itself flows.
  3. Radiation. Heat travels as electromagnetic waves and needs no medium. This is how heat from the Sun crosses empty space to reach the Earth.
  4. So. The three fundamental modes are conduction, convection and radiation, which is option (a).

The idea to keep. Name the mode by asking what carries the heat: particles staying in place give conduction, a flowing fluid gives convection, and electromagnetic waves give radiation.

Answer from the NTA final answer key. Solution by PrepWiser.

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