Rainfall Distribution
Rainfall Distribution
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quiz Questions
Q71
Why does the annual rainfall value show a steady operational decrease as one moves from East to West along the Indo-Gangetic Plains of India?
The Coriolis force drops down to near zero values over Patna
The monsoon winds progressively exhaust their moisture content away from the sea
The Aravalli range blocks the entry of winds into West Bengal completely
The local sub-surface geothermal activity increases near Lucknow
Explanation
The Bay of Bengal branch of the southwest monsoon moves westwards along the Ganga plains, progressively losing its moisture content as it travels further away from its marine source.
Q72
Under the Thornthwaite climate classification system, which letter symbol designates the perhumid climate type found in the Western Ghats and Northeast India?
C
A
D
E
Explanation
In Thornthwaite's system based on moisture index and evapotranspiration, the uppercase symbol 'A' designates the perhumid rainforest style climate region.
Q73
During a typical La Niña event, how does the convective rainfall setup change over the equatorial western Pacific Ocean and maritime India?
Convective heating collapses entirely across the equator
Convection intensifies significantly, boosting monsoon precipitation
Air masses undergo absolute mechanical stabilization
Moisture advection angles tilt away into the Atlantic
Explanation
La Niña enhances convective activity and low-pressure anomalies over the western Pacific and eastern Indian Ocean, resulting in a stronger Walker Circulation and above-normal monsoon rain over India.
Q74
Which high-altitude tracking wind index brings unseasonal winter hailstorms to the states of Madhya Pradesh and Maharashtra?
The absolute dissolution of the Somali low-level jet
The interaction of Western Disturbances with moist easterly waves over Central India
The southward plunges of Siberian anticyclonic winds
The localized thermal heating inside the Palk Strait corridor
Explanation
When Western Disturbances interact with moist easterly winds moving up from the Bay of Bengal over central India, they induce strong convective instability leading to winter hailstorms.
Q75
Why does the city of Jodhpur record a high variance in its rainfall schedule, showing extreme instability from year to year?
It lacks the baseline Coriolis effect tracking capability
It is located on the peripheral arid margin where the monsoon system is highly sensitive
The Aravalli mountains completely isolate its boundary thermally
The local soil features excessive sub-surface iron oxide content
Explanation
Jodhpur lies on the margins of the arid Thar Desert where the monsoon system is structurally thin and highly sensitive to subtle variations in global indices like ENSO and IOD.
Q76
Which of the following regional pockets in the interior Peninsular India acts as a dry island, recording less than 50 cm of annual rainfall due to double rain-shadow effects?
The Assam Valley Basin
Marathwada and Rayalaseema Interiors
The Konkan Plain Strip
The Tripura Foothills Margin
Explanation
The central core of the Deccan Plateau, specifically the Marathwada region of Maharashtra and the Rayalaseema region of Andhra Pradesh, forms a severe dry pocket due to orographic blocking by both the Western and Eastern Ghats depending on the wind branch.
Q77
Under the modified Thornthwaite classification system, what type of climate pattern dominates the vast expanse of the Indo-Gangetic Plains of Northern India?
Perhumid Rain Forest Type
Sub-humid Type with seasonal moisture deficit
Arid Desert Core configuration
Semi-arid Steppe landscape architecture
Explanation
Thornthwaite designates the Indo-Gangetic plain belt as 'C2' or Sub-humid, characterized by a seasonal moisture deficit during winter months.
Q78
The 'Break-in-Monsoon' scenario causes a sharp drop in rainfall over central India but drastically accelerates the risk of flash floods in which alternative zone?
The Western Thar Desert fringes
The Himalayan foothills and North-Eastern river basins
The Southern Deccan internal shield
The Gulf of Khambhat littoral strip
Explanation
During a monsoon break, the monsoon trough shifts northwards to the Himalayan foothills, shifting the rainfall zone to the mountain catchments and causing flash floods in rivers like Kosi and Brahmaputra.
Q79
The high spatial variability of rainfall recorded inside the state of Gujarat is structurally determined by which geographical reality?
The complete absence of the rotational Coriolis effect tracking
The transition from the humid coastal track to the peripheral arid margin without relief barriers
The extreme concentration of sub-surface heavy zinc deposits
The structural failure of the local tidal current alignment matrix
Explanation
Southern Gujarat sits directly in the path of the Arabian Sea monsoon surge, receiving high rain, whereas western Saurashtra and Kachchh lie on the arid periphery without significant orographic barriers, leading to high variability.
Q80
Under Koeppen's classification system, the symbol 'Cwg' includes a lowercase letter 'g'. What does this 'g' structurally mean for the Indo-Gangetic Plains climate pattern?
Geothermal pressure line alignment
Ganga type temperature curve where peak heat precedes summer rains
Glacial meltwater moisture index
Gulf branch dominant precipitation matrix
Explanation
In Koeppen's layout, the letter 'g' signifies the 'Ganga type' temperature profile, where the hottest season of the year precedes the summer monsoon rainy season.