✅ Answer: A) 1 and 2 onlyStatements 1 and 2 are correct. SW monsoon arrives in Kerala by June 1. NE monsoon brings rainfall to Tamil Nadu (October-December). Statement 3 is incorrect — Western Disturbances bring WINTER rainfall (not summer) to NW India. They are cyclonic storms from the Mediterranean that travel eastward during December-February.

✅ Answer: B) Kerala and KarnatakaMango Showers are pre-monsoon showers that occur in Kerala and Karnataka during April-May. They help ripen mangoes and are beneficial for coffee cultivation. “Cherry Blossoms” are similar pre-monsoon showers in Karnataka that help coffee cultivation. “Kalbaisakhi” (Nor’westers) are pre-monsoon thunderstorms in West Bengal and Assam.

✅ Answer: B) Low-pressure belt near the equatorThe ITCZ (Inter-Tropical Convergence Zone) is a low-pressure belt near the equator where the northeast and southeast trade winds converge. In summer, it shifts northward over the Indian subcontinent (to ~25°N), drawing the SW monsoon winds. This northward shift of the ITCZ is one of the key mechanisms of the Indian monsoon.

✅ Answer: B) Leeward side of Western Ghats (Deccan Plateau)The rain shadow effect is most prominently seen on the leeward (eastern) side of the Western Ghats — the Deccan Plateau. The SW monsoon hits the Western Ghats (windward side) and gives heavy rainfall. As it crosses the Ghats, it loses moisture, resulting in low rainfall on the eastern side (rain shadow zone). Pune and Nashik receive much less rainfall than Mumbai.

✅ Answer: B) Bay of Bengal more frequent; Arabian Sea more intenseBay of Bengal cyclones are more frequent (~80% of all cyclones) because of warmer, shallower water and more moisture. Arabian Sea cyclones are less frequent but more intense because of deeper, warmer water. Cyclone Tauktae (2021) in the Arabian Sea was one of the most intense cyclones to hit India’s west coast.

✅ Answer: C) Arabic (Mausim = season)The word “monsoon” is derived from the Arabic word “Mausim” meaning season. Arab traders used this term to describe the seasonal reversal of winds over the Indian Ocean. The monsoon is characterised by a complete reversal of wind direction between summer and winter — SW monsoon in summer, NE monsoon in winter.

✅ Answer: B) Sudden onset with heavy rainfallThe “burst of monsoon” refers to the sudden onset of the SW monsoon with heavy rainfall after a dry pre-monsoon period. When the monsoon arrives in Kerala (around June 1), it is accompanied by strong winds, heavy rainfall, and thunderstorms — a dramatic change from the hot, dry pre-monsoon weather. This sudden onset is called the “burst of monsoon.”

✅ Answer: C) Both SW and NE monsoonThe Andaman and Nicobar Islands receive rainfall from both the SW monsoon (June-September) and the NE monsoon (October-December). They are located in the Bay of Bengal and receive heavy rainfall throughout the year. The SW monsoon arrives here in late May — before it reaches the mainland. Annual rainfall is very high (~3,000 mm).

✅ Answer: B) Weakening in summer, allowing monsoon to advanceThe Subtropical Jet Stream (STJ) flows over India during winter, blocking the monsoon. In summer, the STJ weakens and shifts northward (over Tibet), allowing the monsoon to advance northward. Simultaneously, the Tropical Easterly Jet Stream (TEJ) strengthens over the Indian peninsula, helping drive the monsoon. This is a key mechanism of the Indian monsoon.

✅ Answer: B) High humidity and temperature as monsoon retreats“October Heat” refers to the uncomfortable combination of high temperature and high humidity in October as the SW monsoon retreats. The sky is clear (no clouds), allowing intense solar radiation, while the ground is still moist from monsoon rains. This creates oppressive heat and humidity, especially in the Gangetic plains and coastal areas.