atmosphere & climatology section 3 MCQ Questions & Answers Detailed Explanation

Answer: (d)

The angular speed of a whirlwind in a Tornado towards the centre remains constant.

Answer: (a)

Answer: (c)

“Chinook”, originally meant a warming wind from the ocean into the interior regions of the Pacific Northwest (the Chinook people lived near the ocean, along the lower Columbia River).

A strong Chinook can make snow one foot deep almost vanish in one day. The snow partly melts and partly evaporates in the dry wind. Chinook winds have been observed to raise winter temperature, often from below -20°C (-4°F) to as high as 10-20°C (50-68°F) for a few hours or days, then temperatures plummet to their base level.

Answer: (b)

Convection rain commonly occurs in warmed or heated areas such as equatorial/tropical regions, where there is an almost daily occurrence and even distribution of rain, and temperate areas in summer.

It is also common in the inter-tropical convergence zone (ITCZ). It happens when the ground surface is locally overheated and the adjacent air, heated by conduction, expands and rises.

Answer: (b)

The troposphere is the lowest layer of the Earth’s atmosphere. The air is very well mixed and the temperature decreases with altitude.

Answer: (a)

An updraught or downdraught is the vertical movement of air as a weather-related phenomenon. Better known as air current, they can be caused by differences in temperature, pressure, or impurity concentration.

Temperature differences can cause air currents because warmer air is less dense than cooler air, causing the warmer air to appear 'lighter.' Rising air is associated with turbulence as it creates low pressure on the surface.