Correct Answer :   Pokhran

Pokhran is a city and a municipality located in Jaisalmer district in the Indian state of Rajasthan. It is a remote location in the Thar Desert region and served as the test site for India’s first underground nuclear weapon detonation. It shot into the international limelight on 7 September 1974 when the then Indian Prime Minister Indira Gandhi verbally authorized scientists at the Bhabha Atomic Research Centre (BARC) at Trombay to detonate small and miniaturized nuclear device. Throughout its development, the device was formally called the “Peaceful Nuclear Explosive (PNE)” by Indian Government, but it was usually referred to as the Operation Smiling Buddha. On May 11 of 1998, 24 years after the first operation, the Atomic Energy Commission of India and the Defence Research and Development Organisation (DRDO) carried out the joint operation, known as Pokhran-II. The AEC India detonated its four devices as part of the underground nuclear testing on Pokhran Test Range.