ಭಾರತದಲ್ಲಿ ತಯಾರಾದ ಮೊದಲ ಪರಮಾಣು ರಿಯಾಕ್ಟರ್ ಯಾವುದು?

Apsara, which went critical at Trombay on 4 August 1956, was India's (and Asia's) first nuclear research reactor.