Civil Services Prep

Prelims 2013 · Geography · Question 64

Variations in the length of daytime and nighttime from season to season are due to

  1. the earth's rotation on its axis
  2. the earth's revolution round the sun in an elliptical manner
  3. latitudinal position of the place
  4. revolution of the earth on a tilted axis

Answer

revolution of the earth on a tilted axis

  • (a) Earth's rotation on its axis: Rotation causes day and night to occur, but not the seasonal variation in their lengths. Incorrect.
  • (b) Earth's revolution round the sun in an elliptical manner: The elliptical orbit mainly affects distance from the Sun slightly, not the changing duration of day and night. Incorrect.
  • (c) Latitudinal position of the place: Latitude affects how much variation is experienced, but it is not the fundamental cause of seasonal change in day length. Not the correct cause here.
  • (d) Revolution of the Earth on a tilted axis: The Earth's axial tilt (23.5°) combined with revolution around the Sun causes seasonal changes in the length of daytime and nighttime. Correct.
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