UPSC Prelims 2013 · Question 64 of 99
UPSC Prelims 2013 question on Day Night Length Variation
- ExamUPSC CSE
- Year2013
- PaperGeneral Studies Paper I
- SubjectGeography
- TopicGeomorphology
- DifficultyEasy
- TypeDirect
Variations in the length of daytime and night time from season to season are due to:
Show answer
Answer: D. Revolution of the Earth on a tilted axis
Analysis
Seasonal variation in the length of day and night occurs because the Earth revolves around the Sun while its axis remains tilted at about 23.5 degrees. Due to this axial tilt, different hemispheres receive varying durations of sunlight during different times of the year. Therefore, the revolution of Earth on a tilted axis causes changes in day and night length across seasons.
Extra UPSC info
During the summer solstice, the Northern Hemisphere experiences the longest day of the year.