Indian Monsoon
Indian Monsoon
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quiz Questions
Q41
What is the primary thermodynamic reason why air masses warming up over the Thar Desert do not cause significant rainfall during the summer monsoon?
The absolute absence of dust particles in the desert sky
Atmospheric subsidence and upper-level dry air inversion
Freezing geothermal pressure cells near the surface
The immediate freezing of condensation nuclei
Explanation
The upper atmospheric anti-cyclonic circulation and subsidence of dry air masses over Rajasthan, combined with lack of mountain barriers, create an inversion layer that suppresses cloud formation.
Q42
The tracking factor known as 'Madden-Julian Oscillation' (MJO) affects the Indian monsoon by operating through which mechanism?
A stationary polar air mass blocking winter winds
An eastward-travelling equatorial wave of convective cloudiness and rainfall
A sudden geothermal heating inside the Arabian Sea basin
A high-velocity dust storm track moving from the Sahara
Explanation
The MJO is an eastward moving convective cloud band along the equator that periodically enhances or suppresses rainfall over the Indian Ocean depending on its phase.
Q43
Which of the following states in India is typically the last to see the complete withdrawal of the Southwest Monsoon?
Rajasthan
Punjab
Tamil Nadu
Gujarat
Explanation
The Southwest Monsoon withdraws first from northwest India in September and moves southwards, completely leaving the southern peninsula (specifically Tamil Nadu/Kerala margins) last by early window of October/November.
Q44
The standard operational definition for the formal 'Onset of Monsoon' over Kerala by the India Meteorological Department (IMD) requires at least what percentage of designated weather stations to record 2.5 mm or more rain for two consecutive days?
40 percent
50 percent
60 percent
75 percent
Explanation
According to IMD criteria, if after May 10th, 60% or more of the 14 designated stations in Kerala and Lakshadweep record a minimum of 2.5 mm of rainfall for two consecutive days, the monsoon onset over Kerala is declared.
Q45
The dynamic 'Mascarene High', an intense subtropical high-pressure cell located near Madagascar, positively influences the Indian southwest monsoon under which operational condition?
When it undergoes absolute thermal dissipation
When it becomes structurally stronger and highly intensified
When it migrates northward into the Arabian Sea basin
When it creates a localized deep atmospheric low-pressure core
Explanation
A structurally stronger and well-defined Mascarene High intensifies the pressure gradient across the equator, driving high-velocity cross-equatorial surge winds that strengthen the monsoon over India.
Q46
The tracking variation index called the 'Equatorial Indian Ocean Oscillator' (EQUINOO) involves a structural dipole pattern measured between which two coordinates?
The Western Equatorial Indian Ocean and the Eastern Equatorial Indian Ocean
The Persian Gulf Core and the South China Sea Margin
The Gulf of Kutch Plain and the Chilika Lake Lagoon
The Southern Antarctic Shelf and the Madagascar Trench Zone
Explanation
EQUINOO represents an atmospheric sea-saw fluctuation pattern measured between the western equatorial Indian Ocean and the eastern equatorial Indian Ocean (specifically near Indonesia), influencing Indian monsoon precipitation cycles.
Q47
The core axis of the Monsoon Trough over Northern India typically displays a diurnal structural oscillation toward which geographical barrier?
The Vindhyan Range foothills
The Himalayan foothills
The Chota Nagpur boundary slopes
The Thar Desert eastern margin
Explanation
The Monsoon Trough displays periodic spatial oscillations; its migration northward toward the foothills of the Himalayas leads to a suppression of rainfall over the plains, creating a monsoon break.
Q48
The upper atmospheric wind system known as the Tropical Easterly Jet Stream (TEJ) reaches its peak intensity and velocity at approximately which pressure level in the troposphere over India?
850 hPa level
500 hPa level
150 hPa level
1000 hPa level
Explanation
The Tropical Easterly Jet Stream develops in the upper troposphere during summer and peaks near the 150 hPa to 100 hPa pressure levels (around 13 to 15 km altitude) over southern India.
Q49
Which structural geographic feature acts as the primary barrier preventing the warm and humid summer monsoon air masses from traveling directly north into Tibet and Central Asia?
The Karakoram Highway Ridge
The Himalayan Mountain Wall
The Kunlun Shan Margin
The Hindu Kush block
Explanation
The high altitudinal physical mass of the Himalayas prevents the northward penetration of the southwest monsoon winds, ensuring that their moisture contents are released entirely over the Indian subcontinent.
Q50
The structural atmospheric dynamic known as 'Walker Circulation' undergoes a major eastward shift across the Pacific during El Niño. How does this shift physically affect the low-pressure setup over India?
It induces rapid structural cooling of the Himalayan snowcaps
It induces atypical atmospheric subsidence of dry air over India
It eliminates the operational depth of the planetary boundary layer
It locks the cross-equatorial trade winds into a tight cyclonic spiral
Explanation
The eastward shifting of the Walker Circulation alters convective activity, causing an anomalous sinking motion (subsidence) of dry air over the Indonesian and Indian regions, which weakens the monsoon low-pressure setup.