Climate & Monsoon MCQ Questions with Answers

The correct answer is A: Erratic. Indian rainfall shows large spatial and temporal variation due to the complex monsoon system, Western Ghats, ITCZ shifts, and weather disturbances, making rainfall distribution highly uneven across regions and months. Options B and C are incorrect because rainfall is not strictly monthly or evenly distributed; some areas get rain mainly during the monsoon while others get very little. Option D is wrong because rainfall is not cyclonic only; it is driven by the south-west monsoon, cyclones, and other systems, contributing to its irregular pattern.

Western Disturbance is an extra-tropical weather system that originates in the Mediterranean region and travels eastward into the north-western parts of India, bringing moisture and leading to hail, rain, and snowfall in the higher elevations. It most strongly affects the northern Indian states with Himalayan terrain, especially Jammu and Kashmir, where moist westerly winds cause heavy snowfall in winter. Arunachal Pradesh, Uttar Pradesh, and Punjab lie farther south or outside the main western Himalayan circulation, so they are less affected by these disturbances. Therefore, the correct state where Western Disturbance causes snowfall is Jammu and Kashmir.

Norwester or Kal Baishakhi is a pre-monsoon thunderstorm occurring in the warm, humid weather of late spring. It mainly affects the plains of West Bengal, bringing sudden, heavy showers and sometimes hail. The phenomenon is named for its suddenness and the sultry stormy wind that accompanies it. Among the given options, West Bengal is the region commonly associated with Norwester rainfall, whereas Kerala, Goa, and Punjab receive rainfall from other seasonal patterns or monaster. This is a distinctive feature of West Bengal’s pre-monsoon climate.

Temperate evergreen forests in India occur in the higher, cooler zones of the Himalayas. They are best developed in the Western Himalayas at elevations above about 3500 m, where the climate remains cool year-round and supports evergreen species. The other options either lie in lower, warmer zones or in different regions where forest types are different (e.g., drier or temperate deciduous). Thus, the correct location for temperate evergreen vegetation is the Western Himalayas above 3500 m.

In winter, the main branch of the jet stream shifts south of the Himalayas due to strong land–sea temperature contrasts and intensified westerlies over the subtropical region. This southward position affects weather patterns across the Indian subcontinent, bringing western disturbances and influencing winter rainfall. Options A, C, and D are incorrect because they describe locations not typically hosting the main winter jet stream: north of the Himalayas is more associated with summer monsoon dynamics, while the Bay of Bengal and Indian Ocean are not the primary winter jet stream corridors.

The normal onset date of the south-western monsoon over India is 1st June. This marks the beginning of widespread monsoon rains across the country, as the southwest monsoon current shifts from the sub-tropics and advances from the Bay of Bengal and the Arabian Sea. The onset is confirmed when rains commence over the Kerala coast and gradually spread north and east. Options A, B, and C (14th June, 10th June, 5th June) are later than the normal onset and do not represent the standard benchmark. Understanding this date helps in predicting monsoon timing, rainfall distribution, and agricultural planning.

The Cauvery River basin shows bimodal rainfall: its upper catchment (Western Ghats) gets heavy rainfall during the south‑west monsoon (summer). The lower catchment, draining towards Tamil Nadu, receives significant rainfall during the retreating north‑east monsoon in winter. This pattern causes the river’s flow to peak in two seasons, aligning with monsoon winds at different parts of the basin. The other rivers listed do not display this distinct two-season rainfall pattern across upper and lower catchments in the same way.