Atmosphere - Study Mode

[#56] Which of the following is located at the minimum height from the Earth?
Correct Answer

(D) Troposphere

Explanation

Solution: The troposphere is the lowest layer of Earth's atmosphere. The troposphere starts at Earth's surface and goes up to a height of 7 to 20 km (4 to 12 miles, or 23,000 to 65,000 feet) above sea level.

[#57] Beaufort Scale is used to measure ________
Correct Answer

(B) Wind velocity

Explanation

Solution: Beaufort Scale is used to measure Wind velocity. Beaufort scale, in full Beaufort wind force scale, scale devised in 1805 by Commander (later Admiral and Knight Commander of the Bath) Francis Beaufort of the British navy for observing and classifying wind force at sea.

[#58] Which of the following depletion results in the increase in the UV radiation on the Earth?
Correct Answer

(C) Ozone

Explanation

Solution: The depletion of the ozone layer leads, on the average, to an increase in ground-level ultraviolet radiation, because ozone is an effective absorber of ultraviolet radiation.

[#59] Consider the following statements: 1. Nearly 99% of the total mass of the atmosphere lies within 30 km of the Earth's surface. 2. The proportion of ozone in the atmosphere increases to a maximum at about 60 km from Earth's surface. Which of the statements given above is/are correct?
Correct Answer

(A) 1 only

Explanation

Solution: Nearly 99% of the total mass of the atmosphere lies within 30 km of the Earth's surface. About 99% of the total atmospheric mass is concentrated in the first 20 miles (32 km) above Earth's surface.

[#60] Which of the following is wrongly matched?
Correct Answer

(B) Rain caused by vertical circulation of air currents - orographic rainfall

Explanation

Solution: Rain caused by vertical circulation of air currents - orographic rainfall is wrongly matched. Orographic precipitation, rain, snow, or other precipitation produced when moist air is lifted as it moves over a mountain range. As the air rises and cools, orographic clouds form and serve as the source of the precipitation, most of which falls upwind of the mountain ridge.