The incident occurred in Sadar police station area when the speeding truck first hit the tractor's trolley from behind and then collided head on with the car, they said.
While the tractor driver, Khetaram, died on the spot the five passengers of the car received injuries and have been admitted to a local hospital where their condition is stated to be stable, police said.
The truck driver has been detained and the truck has been seized, they added.