The Kopili Hydroelectric Project was the first major hydropower project in:

Northeast India
South India
West India
Central India

The correct answer is: a) Northeast India.

The Kopili Hydroelectric Project is a hydroelectric power station on the Kopili River in the state of Meghalaya, India. It was the first major hydropower project in Northeast India. The project was commissioned in 1970 and has a installed capacity of 200 MW.

The other options are incorrect because:

  • South India: The first major hydropower project in South India was the Mettur Dam, which was commissioned in 1934.
  • West India: The first major hydropower project in West India was the Sardar Sarovar Dam, which was commissioned in 2002.
  • Central India: The first major hydropower project in Central India was the Hirakud Dam, which was commissioned in 1957.