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UPSC 1997: The January isotherm taken as a basis for dividing India into tropical and sub-tropical zones is
(a)21 °C
(b)18 °C
(c)12 °C
(d)15 °C
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Not attemptedCorrect Answer: (b) 18 °C
Indian climatologists use the mean January 18 °C isotherm to separate Tropical India (south of the line, > 18 °C) from Sub-tropical/Temperate India (north, < 18 °C). Therefore the isotherm basis is 18 °C, making option (b) correct; the other temperatures are not used for this classification. ([uttarpradesh.pscnotes.com](https://uttarpradesh.pscnotes.com/uppcs-prelims/the-january-isotherm-taken-as-a-basis-for-dividing-india-into-tropical/))
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Frequently Asked Questions
What is the correct answer to this UPSC 1997 Geography question?▼
The correct answer is option (b): 18 °C. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Atmosphere & Climatology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1997, GS Paper 1, as Question 10. It falls under Geography > Atmosphere & Climatology.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Atmosphere & Climatology?▼
UPSC has asked 70 questions from Atmosphere & Climatology (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.