Q. Which of the following factors has influence on insolation?
1.The rotation of earth on its axis.
2.The angle of inclination of the sun’s rays.
3.The configuration of land.
Choose the correct answer from below given codes:

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: D
Notes:

Explanation: The amount and the intensity of insolation vary during a day, in a season and in a year. The factors that cause these variations in insolation are:

  1. the rotation of earth on its axis;
  2. the angle of inclination of the sun’s rays;
  3. the length of the day;
  4. the transparency of the atmosphere;
  5. the configuration of land in terms of its aspect. The last two however, have less influence.

Source: NCERT – Fundamental of Physical Geography

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