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State PCS PYQPrelims 2024

BPSC – Combined Competitive Examination · Question 15

Heat transfer that does not require a medium is called:

  1. Radiation
  2. Reflection
  3. Conduction
  4. Convection
Show answer & explanation

Answer: (A) Radiation

Explanation

Radiation needs no medium, which is how the Sun's heat reaches Earth.

  • (A) Correct

    Correct: radiation travels as electromagnetic waves, even through vacuum.

  • (B) Incorrect

    Wrong: not a mode of heat transfer.

  • (C) Incorrect

    Wrong: needs a material medium (mostly solids).

  • (D) Incorrect

    Wrong: needs a fluid medium.