Atmosphere MCQ Question and Answer | Geography MCQ Question

The term Sirocco (sometimes also spelled Scirocco) is an all-inclusive name given to hot and subsequently humid southeast to southwest winds originating as hot, dry desert-air over Northern Africa, flowing northward into the southern Mediterranean basin. Sirocco is a hot dry wind blowing across the North African coast.

The annual range of temperature is greater in the Northern Hemisphere than that in the Southern Hemisphere. Since there is more land in Northern Hemisphere and more waters in Southern hemisphere and there is a big difference between the specific heat of land and water; the loss of heat from the continents is bigger than the oceans.

The zone of Earth's atmosphere immediately above its surface up to a height of about 16 kms above equator and 8 kms over the poles is known as troposphere. The troposphere is the lowest layer of Earth's atmosphere. Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Most types of clouds are found in the troposphere, and almost all weather occurs within this layer.

An apparent force that arises because of the earth's spin around its axis. Freely-moving objects are deflected to the right of their direction of motion in the northern hemisphere and to the left of their direction of motion in the southern hemisphere.

The troposphere is the lowest layer of Earth's atmosphere. Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Most types of clouds are found in the troposphere, and almost all weather occurs within this layer.

When condensation takes place below 0° C and precipitation occurs in the form of flakes causes snowfall. If the humidity below the cloud base is low, the crystals may evaporate after leaving the cloud and so never reach the ground. If the temperature at the cloud base and just below it is close to zero, the snow crystals will tend to aggregate and form snowflakes.

A cloudburst is sudden copious rainfall. It is a sudden aggressive rainstorm falling for a short period of time limited to a small geographical area. Meteorologists say the rain from a cloudburst is usually of the shower type with a fall rate equal to or greater than 100 mm (4.94 inches) per hour. Cloudbursts are often accompanied by hail or thunderstorms.

Wind will always blow along the pressure gradient from areas of high pressure to those of low pressure. The changes in pressure in the atmosphere arise from changes in temperature, which in turn is due to differences in how the sun heats different patches of air.

The phenomenon of 'trade winds' takes place due to convection of heat. The Sun warms the ground, which in turn warms the air directly above it. The warmer air expands, becoming less dense than the surrounding air mass, and creating a thermal low.

Roughly V-shaped isobar system with a low pressure at the centre represents a hurricanes.