Indrapuri Barrage has been constructed on which river in Bihar?

The correct answer is: B. Kosi

The Indrapuri Barrage is a barrage on the Kosi River in Bihar, India. It was constructed in 1963 to control floods and provide irrigation water for the surrounding area. The barrage is 1,200 meters long and 10 meters high. It has 36 gates, each of which is 15 meters wide. The barrage has been effective in controlling floods, but it has also had some negative environmental impacts. For example, it has blocked the migration of fish and has caused the siltation of the riverbed.

The other options are incorrect because:

• The Gandak River is located in Bihar and Uttar Pradesh.
• The Son River is located in Madhya Pradesh, Uttar Pradesh, and Bihar.
• The Bagmati River is located in Nepal and India.