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General Knowledge Cluster12 Verified Questions
Atmospheric Layers GK Questions & Answers
Earth's atmosphere is a gravitationally bound gaseous envelope composed primarily of nitrogen (78.08%), oxygen (20.95%), argon (0.93%), and carbon dioxide (0.04%), stratified into distinct thermal layers based on temperature lapse rates. The troposphere is the lowest layer, extending from the Earth's surface to an average altitude of 8 kilometres at the poles and 18 kilometres at the equator. It contains over seventy-five percent of total atmospheric mass, where temperature decreases with height at the environmental lapse rate of 6.5°C per kilometre, hosting virtually all meteorological phenomena. Above the tropopause lies the stratosphere (extending to 50 kilometres), where temperature increases with altitude due to ultraviolet radiation absorption by the ozone layer (ozonosphere), offering stable conditions for jet aircraft transit. The mesosphere extends to 85 kilometres, characterized by temperatures plunging to -90°C—the coldest in the atmosphere—where meteoroids typically disintegrate. Above the mesopause, the thermosphere experiences steep temperature increases from solar X-ray absorption; its lower ionized sector, the ionosphere (comprising D, E, and F layers), enables long-distance radio communication by reflecting terrestrial electromagnetic waves, while also generating aurora displays.
High-yield conceptual summaries for competitive exams and rapid revision.
The troposphere contains over 75% of atmospheric mass and all weather phenomena, exhibiting a normal lapse rate of 6.5°C per kilometre.
The stratosphere extends up to 50 km and houses the ozone layer (O3), which absorbs harmful solar ultraviolet (UV) radiation.
The mesosphere extends to 85 km, featuring Earth's coldest atmospheric temperatures (down to -90°C) and burning up incoming meteoroids.
The thermosphere and ionosphere absorb solar X-rays and extreme UV radiation, reflecting radio waves to facilitate global telecommunications.
Auroral displays (Aurora Borealis and Australis) occur in the thermosphere when charged solar particles collide with atmospheric gas molecules.
Showing 12 Curated Questions12 Total in Bank
1ID: GK-GEOG-00988
hardIndian Climate, Monsoon Dynamics & Seasons
During the summer monsoon onset, the Tropical Easterly Jet (TEJ) establishes itself in the upper troposphere over Peninsular India at approximately 14°N latitude primarily as a result of what thermal mechanism?
Verified Explanation
During summer, the high-altitude Tibetan Plateau acts as an elevated thermal heat engine, warming the middle and upper troposphere. This generates an upper-level anticyclone and a strong meridional thermal gradient that drives the Tropical Easterly Jet (TEJ) westward at 100-150 hPa over Peninsular India, stabilizing the monsoon circulation.
2ID: GK-DMGT-00225
hardCyclones, IMD Alerts, GLOFs & Urban Floods
What meteorological phenomenon consists of long, narrow corridors of intense horizontal water vapour transport in the lower troposphere capable of triggering catastrophic flood events?
Verified Explanation
Atmospheric Rivers (ARs) are relatively narrow, transient regions of heavy tropospheric water vapor transport that typically extend thousands of kilometers ahead of cold fronts. When they make landfall and encounter mountain topography, orographic lifting unleashes torrential flooding.
3ID: GK-DMGT-00467
hardCyclones, Floods & Glacial Lake Outburst Floods
What meteorological phenomenon, characterized by narrow, transient corridors of intense horizontal water vapour transport in the troposphere, is increasingly linked to catastrophic extreme precipitation events along the Western Ghats and coastal India?
Verified Explanation
Atmospheric Rivers (ARs) are long, narrow regions in the atmosphere that transport vast amounts of water vapour out of the tropics. When these moisture-laden corridors make landfall and encounter orographic barriers like the Western Ghats or Himalayas, they trigger massive orographic precipitation, causing widespread floods and landslides.
4ID: GK-DMGT-00520
mediumCyclones, Floods & Glacial Lake Outburst Floods
What meteorological phenomenon, involving long, narrow corridors of intense horizontal water vapor transport in the lower troposphere, has been identified as a major driver of extreme flood events along the Western Ghats?
Verified Explanation
Atmospheric Rivers (ARs) are relatively narrow, transient corridors of high integrated water vapor transport in the lower atmosphere, typically extending over thousands of kilometres with widths of several hundred kilometres. Research by IIT Gandhinagar and MoES demonstrates that intense summer monsoon atmospheric rivers channeling moisture from the southern Indian Ocean and Arabian Sea, upon striking the steep orography of the Western Ghats, unleash catastrophic extreme precipitation leading to landslides and mega-floods in Kerala and Maharashtra.
5ID: GK-ENV-00572
hardPollution & Greenhouse Gases
What is the primary atmospheric oxidation mechanism that acts as the primary 'detergent' of the troposphere, breaking down methane, CO, and volatile organic pollutants?
Verified Explanation
Hydroxyl radicals (·OH), formed photochemically from ozone and water vapor in the presence of UV light, are the primary atmospheric oxidants destroying methane, CO, and non-methane VOCs.
6ID: GK-WGEOG-00275
mediumClimate Zones
Which large-scale atmospheric circulation cell features rising warm air near the equator, poleward movement in the upper troposphere, and descending dry air around 30 degrees latitude?
Verified Explanation
The Hadley Cell is an atmospheric convection loop named after George Hadley, responsible for tropical rain belts near the equator and major subtropical deserts around 30° latitude.
7ID: GK-GEOG-00694
hardClimate & Monsoon
The Tropical Easterly Jet (TEJ), an upper-tropospheric jet stream that steers monsoon depressions across peninsular India, is generated by intense summer heating of which elevated landmass?
Verified Explanation
During the northern summer, the vast, elevated Tibetan Plateau acts as a high-altitude thermal engine, heating the middle troposphere. This generates strong antcyclonic outflow at 200–100 hPa altitude, which flows southwestward across southern Asia and the Indian peninsula as the Tropical Easterly Jet (TEJ). The strength of the TEJ is directly linked to the vigor of the Indian Southwest Monsoon.
8ID: GK-GEOG-00781
easyIndian Climate, Monsoon Dynamics & Seasons
Which upper-tropospheric easterly wind system, originating due to the intense thermal heating of the Tibetan Plateau, blows across Peninsular India at 100–150 hPa during summer?
Verified Explanation
The Tropical Easterly Jet (TEJ) is an upper-level wind stream that originates in the upper troposphere over the heated Tibetan Plateau and extends across southern India and the Arabian Sea to the Horn of Africa near latitude 14°N. It creates upper-level divergence that helps maintain surface low-pressure systems and steers monsoon depressions across central India.
9ID: GK-WGEOG-00349
hardClimate Zones
The atmospheric circulation cell that transports heat from the equator to roughly 30° North and South latitude, creating the subtropical desert belts at its descending limb, is known as what?
Verified Explanation
The Hadley cell involves air rising near the equator at the ITCZ, flowing poleward in the upper troposphere, descending in the subtropics around 30° latitude (creating horse latitudes and deserts), and returning equatorward.
10ID: GK-WGEOG-00356
easyClimate Zones
The atmospheric layer closest to the Earth's surface, extending up to about 12 km on average and containing nearly all weather phenomena, is the:
Verified Explanation
The troposphere contains approximately 75% of the atmosphere's total mass and 99% of its water vapor, where clouds, precipitation, and storms occur.
11ID: GK-WGEOG-00517
hardContinents Oceans
In Earth's global atmospheric three-cell circulation model, which meridional cell operates between the equator and 30 degrees latitude in each hemisphere?
Verified Explanation
The Hadley Cell features rising warm air near the equator, poleward upper-troposphere transport, descending dry air at 30° latitude (subtropical highs), and equatorward return trade winds.
12ID: GK-WGEOG-00574
hardClimate Zones
In atmospheric general circulation, which meridional overturning cell operates between the thermal equator and subtropical high-pressure ridges at approximately 30° latitude?
Verified Explanation
The Hadley Cell features rising warm air near the equator, poleward flow in the upper troposphere, sinking air in the subtropics creating deserts, and equatorward surface return flow (Trade Winds).
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