Q43 (CDS-II/2008) Geography › World Physical Geography › Atmospheric pressure winds Answer Verified

Assertion (A) : In temperate cyclones winds below from the periphery towards its centre. Reason (R) : There is high pressure in the centre of temperate cyclone.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true, but R is not the correct explanation of A

A is true, but R is false

A is false, but R is true

Result

Your answer: — · Correct: C

Explanation

Assertion (A) is true because temperate cyclones (also known as extra-tropical or wave cyclones) are atmospheric disturbances characterized by a low-pressure center surrounded by increasing pressure outward [t1][t3]. This pressure gradient causes winds to blow from the periphery towards the center, resulting in convergent air circulation [t1][t3]. Reason (R) is false because cyclones, by definition, are systems of low atmospheric pressure at the center [t5][t7]. High pressure at the center is a characteristic of an anticyclone, where winds diverge and blow from the center outward [t3][t5]. In temperate cyclones, the pressure gradient is typically lower compared to tropical cyclones, and the isobars are often 'V' shaped rather than circular [c3]. Therefore, while the wind direction is correctly described in the assertion, the reason provided is scientifically incorrect as it describes an anticyclonic condition.

Sources

[1] https://gcwk.ac.in/econtent_portal/ec/admin/contents/82_P18GC102_2020120502122661.pdf
[2] https://forecast.weather.gov/glossary.php?word=cyclone
[3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 28: Temperate Cyclones > 28.5. Tropical Cyclones vs. Temperate Cyclones > p. 409

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Assertion (A) : In temperate cyclones winds below from the periphery towards its centre. Reason (R) : There is high pressure in the centre of temperate cyclone.

Explanation

SIMILAR QUESTIONS

Assertion (A) : The surface winds spiral inwards upon the centre of the cyclone. Reason (R) : Air descends in the centre of the cyclone.

Assertion (A) : 60°-65° latitudes in both the hemispheres have a low pressure belt instead of high pressure. Reason (R) : The low pressure areas are permanent over oceans rather than on land.

Assertion(A): Tropical cyclones do not develop very close to the Equator. Reason (R) : A weak coriolis effect retards the development of circular air motion.

Assertion (A) : Higher pressure occurs at lower latitudes as compared to higher latitudes. Reason (R) : The region of lower latitudes receive more heat from solar radiation as compared to the regions of higher latitudes.

Assertion (A) : The thickness of the atmosphere is maximum over the Equator. Reason (R) : High insolation and strong convection currents occur over the Equator.