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NDA 2016 GAT · General Knowledge · Heat and Thermal Physics · easy

Heat transfer by convection takes place in solids. 2. Heat from the Sun reaches the Earth by radiation.

Single correct option

Consider the following statements:
1. Heat transfer by convection takes place in solids.
2. Heat from the Sun reaches the Earth by radiation.
Which of the statements given above is/are correct?
  1. A. 1 only
  2. B. 2 only
  3. C. Both 1 and 2
  4. D. Neither 1 nor 2
Show answer and solution

Answer: (B) 2 only

Convection needs bulk movement of particles, which occurs only in fluids, liquids and gases, and not in solids; statement 1 is false. The Sun's heat crosses the empty space between the Sun and the Earth as electromagnetic radiation, which requires no medium, so statement 2 is true. Only statement 2 is correct.
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Original question written in the NDA 2016 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake