DAILY CURRENT AFFAIRS QUIZ – 9 May 2025

Answer: b. Conduction

Explanation: Conduction is the process by which heat is transferred from the

Earth’s surface to the lower layers of the atmosphere when they are in contact

with each other. It occurs primarily through direct contact with the land.

Answer: d. Perihelion

Explanation: The nearest distance between the Earth and the Sun during its orbit

is called “perihelion,” which occurs on 3rd January

Answer: b. Insolation

Explanation: The energy received by the Earth’s surface from the Sun is known as

“insolation,” which is a term derived from “incoming solar radiation.”

Insolation

What is insolation?

Insolation is the amount of solar radiation that reaches the Earth’s surface. It is

measured in watts per square meter (W/m^2).

Source of insolation

The sole ultimate source of atmospheric energy is heat and light received through

space from the Sun. This energy is known as Solar Insolation.

Amount of insolation reaching Earth’s surface

Only two energy units out of 1,00,00,00,000 units of energy radiated by the

sun reach the earth’s surface due to its small size and great distance from the

Sun.

Unit of measurement of insolation

The unit of measurement of this energy is Langley (Ly). At the height of its

atmosphere, the earth receives 1.94 calories per square centimetre per minute

(2 Langley)

Answer: b. Reflecting radio waves

Explanation: The ionosphere, located between 80 and 400 km above the mesopause, contains electrically charged particles known as ions. One of its key characteristics is its ability to reflect radio waves transmitted from the earth back to the earth’s surface. This property makes it essential for long-distance radio communication and is a crucial aspect of the ionosphere’s role in the Earth’s atmosphere.

Answer: c. A zone that separates the troposphere and stratosphere

Layers of the Atmosphere:

Troposphere:

 Description of the troposphere as the lowermost layer.

 Average height, variations with latitude.

 Presence of dust particles and water vapor.

 Significance for climate, weather, and biological activity.

 Temperature variation with height.

Tropopause:

 Explanation of the zone separating troposphere and stratosphere.

 Temperature characteristics over equator and poles.

Stratosphere:

 Description of the stratosphere.

 Extent and height range.

 Significance of the ozone layer.

 Role in absorbing ultra-violet radiation.