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Q66 (CAPF/2019) Geography › World Physical Geography › Earth rotation and time Answer Verified

If the eatorial plane of earth is NOT inclined to its orbit, then

Result
Your answer: —  Â·  Correct: C
Explanation

The Earth's axis of rotation is currently tilted at approximately 23.5° relative to the normal of its orbital plane (the ecliptic) [3]. This axial tilt, or obliquity, is the primary driver of seasonal variations because it causes different hemispheres to receive varying amounts of solar radiation throughout the year as the Earth orbits the Sun [1]. If the equatorial plane were not inclined to its orbit (meaning the axial tilt was zero), the rotational axis would be perfectly perpendicular to the orbital plane [1]. In such a scenario, the Sun would always be directly overhead at the equator, and every location on Earth would experience nearly constant day lengths and solar intensity year-round [2]. Consequently, the distinct cycle of spring, summer, autumn, and winter would cease to exist, leading to a lack of seasonal change.

Sources

  1. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 12: Earth, Moon, and the Sun > 12.2.2 Seasons on the Earth > p. 177
  2. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 19: The Motions of The Earth and Their Effects > 19.1. Rotation of Earth > p. 251
  3. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 19: The Motions of The Earth and Their Effects > Lunar Nodal Cycle > p. 266
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SIMILAR QUESTIONS

CDS-I · 2002 · Q117 Relevance score: 2.08

Which one of the following would have occurred if the earth had not been inclined on its own axis?

NDA-II · 2009 · Q34 Relevance score: -0.15

Consider the following statements : 1. The earth’s rotation axis is not at 90° to its orbital plane, 2. The earth’s rotation axis is inclined at 23.5°. Which of the statements given above is/are correct?

NDA-I · 2011 · Q55 Relevance score: -0.33

If the Earth’s axis were perpendicular to the plane of its orbit, which one among the following would not have happened ?

NDA-I · 2014 · Q98 Relevance score: -2.59

The summer and winter seasons in a year are caused by

NDA-I · 2015 · Q37 Relevance score: -3.07

To a perpendicular to the plane of ecliptic, Earth’s axis of rotation makes an angle of 23~ degrees. Had this angle been zero degree, which one among the following would result ?