PrepRung
Sign inSign up free

NDA 2018 GAT · General Knowledge · Heat and Thermal Physics · easy

The heat from the Sun reaches the Earth mainly by

Single correct option

The heat from the Sun reaches the Earth mainly by
  1. A. radiation
  2. B. conduction
  3. C. convection
  4. D. conduction and convection together
Show answer and solution

Answer: (A) radiation

Between the Sun and the Earth there is almost entirely empty space, so no medium exists for conduction or convection. Heat travels as electromagnetic radiation, which does not need a medium. Convection occurs in fluids and conduction in solids, which is why these options are traps.
Report a mistake

Original question written in the NDA 2018 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