NCERT Exercises 1. Choose the right answer from the four alternatives given below. (i) What causes rainfall on the coastal areas of Tamil Nadu in the beginning of winters? (a) South-West monsoon (b) Temperate cyclones (c) North-Eastern monsoon (d) Local air circulation Ans. (c) North-Eastern monsoon (ii) What is the proportion of area of India which receives annual rainfall less than 75 cm? (a) Half (b) One-third (c)Two-third (d) Three-fourth Ans. (b) One-third Note – According to Ministry of Statistics and Programme Implementation, Government of India 1/3 rd area of India receives annual rainfall less than 75 cm. According to the Ministry the Distribution of Area according to Annual Rainfall (in MM) is following Category: DRY 0-750 MM 30%; Medium 750-1150 MM 42%, 1150-2...