Seven students of the premier institute had gone to the river bank last night and later three of them went to swim in the river.
The locals urged them not to go for a swim and rescued two of them but one of them - a third-year Mechanical Engineering student Rabindra Kumar Roy - went missing.
National Disaster Response Force (NDRF) and State Disaster Response Force (SDRF) personnel have launched a search operation to find the missing youth, sources said.