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

examrobotsa's picture
Q: 149 (IAS/2002)

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

question_subject: 

Geography

question_exam: 

IAS

stats: 

0,87,100,87,38,50,12

keywords: 

{'cyclone': [1, 1, 2, 3], 'spiral inwards': [0, 0, 1, 0], 'air': [1, 0, 0, 0], 'surface': [1, 0, 0, 0]}

The correct answer is indeed option 3.

Option 3 asserts that the surface winds do spiral into the center of a cyclone (A), which is a correct depiction of cyclonic wind behavior due to low-pressure regions compelling air towards the center.

However, reason (R) is false as it connotes that air descends in the center of the cyclone which is not accurate. In reality, air rises in the center of cyclones due to the low pressure, creating a mechanism for the convection currents that propel the system.

Option 1 and 2 are incorrect because they both consider (R) as true. The difference between them is whether (R) is the correct explanation of (A) or not.

Option 4 suggests that (A) is false (which it isn`t) and (R) is true (which it isn`t), and therefore is also incorrect.