Atmosphere MCQ Question and Answer | Geography MCQ Question

The troposphere is the layer that we live in. The troposphere starts at ground level and extends about 12 km upwards. From about 12 km to 50 km upwards is the stratosphere. In this layer, the jet stream blows strong winds eastward. The mesosphere is the coldest region of Earth’s atmosphere. It’s somewhere close to -100° Celsius. The ionosphere is defined as the layer of the Earth's atmosphere that is ionized by solar and cosmic radiation. It lies 75-1000 km (46-621 miles) above the Earth. The exosphere is the uppermost region of Earth's atmosphere as it gradually fades into the vacuum of space.

As Earth travels from West to East, air moving from the southern hemisphere to the northern hemisphere gets pushed to the right, causing hurricanes originating in the Northern hemisphere to spin in the counter-clockwise direction.

Countries favourably influenced by Westerlies are Western Europe, British Columbia and East of U.S.A., South-West Africa and South Chile and New Zealand.

Depression in the southern hemisphere is a mass of air whose isobars form an oval or circular shape. In the southern hemisphere, the circular movement of winds is in a clockwise direction. Depressions are rarely stationary and tend to follow definite tracks. They are most influential over the ocean spreads and they weaken over land areas.

The hot and dry winds that help in the ripening of grapes in the Alps region is Foehn. Foehn is a type of dry, warm, down-slope wind that occurs in the lee (downwind side) of a mountain range.

One kg per sq mtr is approximately the quantum of the pressure exerted by the atmosphere at sea level.

Nitrogen is the most abundant gas in the atmosphere. Air is composed of 78.03% nitrogen.

Nimbostratus clouds typically form at the ground level up to an altitude of about 6,000 feet in the sky. Clouds occurring at ground level are what scientists call fog.

The jet aircrafts fly very easily and smoothly in the lower stratosphere because There are no clouds or water vapour in the lower stratosphere and There are no vertical winds in the lower stratosphere.

Atmospheric instability is the most important factor in thunderstorm development. Surface heating brings about an element of instability in the warm and moist air lying close to the surface. That is why warm and moist air becomes unstable in spring and summer when it is heated from below. Air mass thunderstorms develop in this way.