The process in which two nuclei of light elements (like that of hydrogen) combine to form a heavy nucleus (like that of helium), is called nuclear fusion. The conditions needed for carrying out nuclear fusion process are millions of degrees of temperature and millions of pascals of pressure.1. The process in which two nuclei of light elements combine to form a heavy nucleus, is calleda. Nuclear fissionb. Nuclear fusionc. Combinationd. None of these2. The conditions needed for carrying out nuclear fusion process area. Millions of degrees of temperatureb. Millions of pascals of pressurec. Both of thesed. None of these3. Heating two deuterium atoms at extremely high temperature produce heavy nucleus of .......... and a .............. is emitted.a. Helium,neutronb. Protium,protonc. Tritium,electrond. None of these.4. The energy produced in nuclear fusion reaction is much more than that produced in a nuclear fission reaction.a. TRUEb. FALSE5. The nuclear reactions which occur at extremely high temperatures are called .......... reactions.a. Thermalb. Thermonuclearc. Exothermicd. Endothermic