<Tr> <Th> Test type </Th> <Td> Underground tests </Td> </Tr> <Tr> <Th> Device type </Th> <Td> Fission / fusion </Td> </Tr> <Tr> <Th> Max . yield </Th> <Td> 43--45 kilotons of TNT (180--190 TJ) tested </Td> </Tr> <Tr> <Th_colspan="2"> Test chronology </Th> </Tr>

Who was the india's president when the first nuclear tests were conducted