Consider the following pairs: <table><tr><th>Reservoirs</th><th>States</th></tr><tr><td>1. Ghataprabha</td><td>Telangana</td></tr><tr><td>2. Gandhi Sagar</td><td>Madhya Pradesh</td></tr><tr><td>3. Indira Sagar</td><td>Andhra Pradesh</td></tr><tr><td>4. Maithon</td><td>Chhattisgarh</td></tr></table> How many pairs given above are not correctly matched?

Answer: C. THREE pairs are NOT correctly matched (1, 3 and 4); only pair 2 is correct. (1) Ghataprabha - Telangana: WRONG. Ghataprabha is a TRIBUTARY OF THE KRISHNA flowing through Karnataka. The Ghataprabha Reservoir is in Karnataka (Belgaum district). Not in Telangana. (2) Gandhi Sagar - Madhya Pradesh: CORRECT. Gandhi Sagar Reservoir is on the Chambal river in Mandsaur and Neemuch districts of MADHYA PRADESH. Part of the Chambal Valley Development Project. Reservoir dam was completed in 1960. (3) Indira Sagar - Andhra Pradesh: WRONG. The major INDIRA SAGAR DAM on the Narmada river is in MADHYA PRADESH (Khandwa district). There may be a smaller reservoir of this name elsewhere, but the famous Indira Sagar is in MP. (4) Maithon - Chhattisgarh: WRONG. Maithon Dam is on the BARAKAR river (tributary of Damodar) in JHARKHAND/WEST BENGAL border area, under DVC (Damodar Valley Corporation). Not in Chhattisgarh. So 3 of 4 are wrongly matched. The question asks 'how many are NOT correctly matched' — answer is 3 (option C). Source: NCERT Class 11 India: Physical Environment / Central Water Commission reservoir inventory.