Previous year MCQs

World Geography UPPSC 2024 GS-I
Question

Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R).

Assertion (A): Jet streams discovered during World War II are high altitude easterly winds.
Reason (R): Jet streams flow with a speed of 300-500 km/hour.

Select the correct answer from the codes given below:

Answer & Solution

Answer: (Detailed Solution Below)

Option B: (A) is false, but (R) is true

Detailed Solution:

The correct answer is “(A) is false, but (R) is true”.

Jet streams are bands of strong wind that generally blow from west to east all across the globe. They impact weather, air travel and many other things that take place in our atmosphere.

Earth has four primary jet streams: two polar jet streams, near the north and south poles, and two subtropical jet streams closer to the equator.

The discovery of the jet stream can be traced back to the explosion of Krakatoa volcano in 1883. Many sources credit real understanding of the nature of jet streams to regular and repeated flight-path traversals during World War II.

Their speeds usually range from 129 to 225 kilometers per hour, but they can reach more than 443 kilometers per hour.

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