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UPSC Prelims 2020 Paper-1 📅 04 Oct, 2020

Consider the following statements:
1. Jet streams occur in the Northern Hemisphere only.
2. Only some cyclones develop an eye.
3. The temperature inside the eye of a cyclone is nearly 10°C lesser than that of the surroundings.
Which of the statements given above is/are correct?

A
1 only
B
2 and 3 only
C
2 only
D
1 and 3 only
Result Summary
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UPSC Prelims
2020 • 04 Oct, 2020 • Paper-1
Consider the following statements:
1. Jet streams occur in the Northern Hemisphere only.
2. Only some cyclones develop an eye.
3. The temperature inside the eye of a cyclone is nearly 10°C lesser than that of the surroundings.
Which of the statements given above is/are correct?
Correct Answer
2 only
Atmospheric Wind Currents: Jet streams are massive, meandering ribbons of high-speed winds racing through the upper troposphere. They are governed by global tem......
Ref/Book : UPSC Prelims 2020
Ref. Subject Geography
Chapter -
Ref. Topic Climatology
Pg. No -
💡 Analysis & Explanation
Atmospheric Wind Currents ▼
Jet streams are massive, meandering ribbons of high-speed winds racing through the upper troposphere. They are governed by global temperature gradients and the Coriolis effect, firmly existing in both the Northern and Southern Hemispheres (polar and subtropical jets). Statement 1 is false.
Cyclonic Eye Formation ▼
The distinct, cloud-free central 'eye' is exclusively a hallmark of highly mature, severely intensified tropical cyclones (hurricanes/typhoons). Weaker tropical storms, depressions, and all extra-tropical (temperate) cyclones completely lack an eye structure. Statement 2 is correct.
Thermodynamics of the Eye ▼
The eye marks a region of strong descending air. As this air violently sinks, it compresses adiabatically and warms up significantly. Consequently, the temperature inside the calm eye is noticeably higher (warmer), not lesser, than the furious cloud walls surrounding it. Statement 3 is false.
Conclusion ▼
Thus, only the limited formation of the cyclonic eye is a scientifically correct meteorological statement.
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