IAS 2011 — Climatology

Westerlies in southern hemisphere are stronger and persistent than in northern hemisphere. Why ? 1. Southern hemisphere has less landmass as compared to northern hemisphere. 2. Coriolis force is higher in southern hemisphere as compared to northern hemisphere. Which of the statements given above is/are correct ?

The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation ? 1. There are no clouds or water vapour in the lower stratosphere. 2. There are no vertical winds in the lower stratosphere. Which of the statements given above is/are correct in this context ?

What could be the main reason/reasons for the formation of African and Eurasian desert belt ? 1. It is located in the sub-tropical high pressure cells. 2. It is under the influence of warm ocean currents. Which of the statements given above is/are correct in this context ?

A layer in the Earth's atmosphere called Ionosphere facilitates radio communication. Why ? 1. The presence of ozone causes the reflection of radio waves to Earth. 2. Radio waves have a very long wavelength. Which of the statements given above is/are correct ?