atmosphere & climatology section 7 MCQ Questions & Answers Detailed Explanation

Answer: (b)

The Roaring Forties is the name given to strong westerly winds found in the Southern Hemisphere, generally between the latitudes of 40 and 50 degrees.

The strong west-to-east air currents are caused by the combination of air being displaced from the Equator towards the South Pole and the Earth's rotation, and there are few landmasses to serve as windbreaks.

Answer: (d)

Tropical Cyclones (also known as Typhoons (in the western Pacific), Hurricanes (Atlantic), or Tropical Revolving Storms) occur all year round over the northern South China Sea.

However, the “Typhoon Season” is taken to be from the Autumn transition (Oct) to the first half of the Northeast monsoon (NovDec), when they occur most frequently in the South China Sea.

Answer: (a)

Answer: (c)

Answer: (d)

Cyclone is a mass of air whose isobars form an oval or circular shape, with low pressure at the centre.

The air converges at the centre and rises to disposed of. In a depression, the winds rotate anticlockwise in the Northern hemisphere. While in the Southern hemisphere, the circular movement of winds is in a clockwise direction.

Answer: (a)

Atmospheric layer which reflects radio waves is called Ionosphere. The ionosphere is a region of the upper atmosphere, from about 85 km (53 mi) to 600 km (370 mi) altitude, and includes the thermosphere and parts of the mesosphere and exosphere. It is distinguished because it is ionized by solar radiation.

It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth.