Which jet stream develops over the Indian peninsula during the season of the south-west monsoon?
- A.The polar front jet
- B.The subtropical westerly jet
- C.The tropical easterly jet
- D.The polar night jet
Correct answer
Explanation
The correct answer is C, the tropical easterly jet. In summer, as the subtropical westerly jet withdraws to the north of the plateau of Tibet, an easterly jet stream forms in the upper air over peninsular India and blows from east to west. Its appearance goes with the burst of the south-west monsoon, and its strength is linked by meteorologists to the performance of the monsoon.
Option A, the polar front jet, blows in the upper air above the meeting of polar and tropical air in the middle latitudes and is not a feature of the Indian peninsula. Option B, the subtropical westerly jet, lies south of the Himalaya in winter and brings the western disturbances; it is present in the Indian region, but in the cold weather season, not in the monsoon. Option D, the polar night jet, forms in the winter stratosphere over the polar regions.
Read the full article: Atmosphere and Winds: Layers, Pressure Belts and Jet Streams
Practice Questions
View allThe ozone layer, which absorbs ultraviolet radiation, lies in which layer of the atmosphere?
- A.Troposphere
- B.Stratosphere
- C.Mesosphere
- D.Thermosphere
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Ozone is concentrated in the lower and middle stratosphere, and because it absorbs ultraviolet radiation the temperature of this layer rises with height instead of falling.
Read the full explanation →The normal lapse rate of temperature in the troposphere is about
- A.6.5 degrees Celsius per kilometre
- B.1 degree Celsius per kilometre
- C.10 degrees Celsius per kilometre
- D.0.65 degrees Celsius per kilometre
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This is the average rate at which air temperature falls as one rises through the troposphere, and it explains why hill stations are cooler than the plains and why high peaks carry snow even in the tropics.
Read the full explanation →Meteors entering the earth's atmosphere burn up mainly in which layer?
- A.Stratosphere
- B.Mesosphere
- C.Thermosphere
- D.Exosphere
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Although the air there is thin, it is dense enough to heat a body moving at cosmic speed by friction, so most meteors glow and are destroyed in this layer and are seen from the ground as shooting stars.
Read the full explanation →Which gas forms the largest share of dry air by volume?
- A.Oxygen
- B.Nitrogen
- C.Argon
- D.Carbon dioxide
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It is comparatively inert, so it dilutes oxygen and slows combustion, and it enters living things mainly through the nitrogen cycle in which bacteria fix it in a usable form.
Read the full explanation →The warm and dry local wind known as the snow eater blows over which region?
- A.The eastern slopes of the Rockies in North America
- B.The northern slopes of the Alps in Europe
- C.The eastern slopes of the Andes in Argentina
- D.The northern edge of the Sahara
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The wind is the Chinook. It descends the leeward slope, is compressed and warmed as it sinks, and can raise the temperature sharply in a few hours; it melts or evaporates the snow cover, which is why herders call it the snow eater and why it is valued for exposing…
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