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Question

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

(a) the earth’s rotation on its axis
(b) the earth’s revolution round the sun in an elliptical manner
(c) latitudinal position of the place
(d) revolution of the earth on a tilted axis

Answer:

D

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Explanation:

The variations in the length of daytime and nighttime from season to season are primarily due to the revolution of the Earth on a tilted axis. The Earth's axis is tilted at an angle of approximately 23.5 degrees relative to its orbit around the Sun. This tilt causes different parts of the Earth to receive varying amounts of sunlight throughout the year as the Earth orbits the Sun.

During the summer season, the hemisphere tilted towards the Sun experiences longer days and shorter nights because the Sun appears higher in the sky, and its rays are more directly overhead. In contrast, during the winter season, the hemisphere tilted away from the Sun experiences shorter days and longer nights because the Sun appears lower in the sky, and its rays are more spread out.

2

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