[{"id":178205,"question":"Gamma radiations are emitted due to:","choices":[{"text":"De-excitation of atom","value":"A"},{"text":"De-excitation of nucleus","value":"B"},{"text":"Excitation of atom","value":"C"},{"text":"Excitation of nucleus","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":178204,"question":"A radio active substance has a half life of four months. 3 -fourth of the substance will decay in:","choices":[{"text":"6 months","value":"A"},{"text":"8 months","value":"B"},{"text":"12 months","value":"C"},{"text":"16 months","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":178203,"question":"The radio active nuclide <sub>86</sub>Ra<sup>228</sup> decays by a series of emissions of three alpha particles and one beta particle. The nuclide X finally formed is:","choices":[{"text":"<sub>64</sub>X<sup>220</sup>","value":"A"},{"text":"<sub>86</sub>X<sup>222</sup>","value":"B"},{"text":"<sub>84</sub>X<sup>216</sup>","value":"C"},{"text":"<sub>88</sub>X<sup>215</sup>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":178202,"question":"The energy equivalent of 1 kg of matter is about:","choices":[{"text":"10<sup>-15</sup> J","value":"A"},{"text":"1 J","value":"B"},{"text":"10<sup>-12</sup>J","value":"C"},{"text":"10<sup>-17</sup>J","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":178201,"question":"Mass equivalent of 931 MeV energy is:","choices":[{"text":"6.02 x 10<sup>-23</sup> kg","value":"A"},{"text":"1.766 x 10<sup>-27</sup>kg","value":"B"},{"text":"2.67 x 10<sup>-29</sup>kg","value":"C"},{"text":"6.02 x 10<sup>-87</sup>kg","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":178200,"question":"How many neutrons are there in the nuclide Zn<sup>66</sup>?","choices":[{"text":"22","value":"A"},{"text":"30","value":"B"},{"text":"36","value":"C"},{"text":"66","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":178199,"question":"The bnding energy for nucleus A is 7.7 Me V and that for nucleus B is 7.8 MeV. Which nucleus has the larger mass?","choices":[{"text":"Nucleas A","value":"A"},{"text":"Nucleus B","value":"B"},{"text":"Less than nucleus","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":60402,"question":"Controlling rods inserted into the reactor are of metal:","choices":[{"text":"Aluminium","value":"A"},{"text":"Cadmium","value":"B"},{"text":"Magnesium&nbsp;","value":"C"},{"text":"Copper","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":60400,"question":"Nuclear fission was discovered by:","choices":[{"text":"Otto Hahn","value":"A"},{"text":"Friz strassmann","value":"B"},{"text":"Both a and b","value":"C"},{"text":"Michaelson","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":60398,"question":"Binding energy per nucleus for uranium is above:","choices":[{"text":"6.7 Mev","value":"A"},{"text":"7.7 Mev","value":"B"},{"text":"6.9 MeV","value":"C"},{"text":"7.9 MeV","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":60397,"question":"James chadwick discovered:","choices":[{"text":"Proton","value":"A"},{"text":"Positron","value":"B"},{"text":"Neutron","value":"C"},{"text":"Electron","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":60396,"question":"I amu =","choices":[{"text":"9.31 MeV","value":"A"},{"text":"931 MeV","value":"B"},{"text":"9.031 MeV","value":"C"},{"text":"None of above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":60394,"question":"Before and after nuclear reaction the number of protons and neutrons:","choices":[{"text":"Must be different&nbsp;","value":"A"},{"text":"Must be decreased","value":"B"},{"text":"Must be increased","value":"C"},{"text":"Remains same","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":60393,"question":"Rutherford performed on experiment on a nuclear reaction in:","choices":[{"text":"1921","value":"A"},{"text":"1981","value":"B"},{"text":"1927","value":"C"},{"text":"1932","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":60391,"question":"The unit of radioactivity is:","choices":[{"text":"Bequerel","value":"A"},{"text":"Henry","value":"B"},{"text":"Pascal","value":"C"},{"text":"Joule","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":60390,"question":"Those elements whose charge number z is greater then __________ are unstable:","choices":[{"text":"80&nbsp;","value":"A"},{"text":"79","value":"B"},{"text":"82","value":"C"},{"text":"83","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":60388,"question":"The binding energy for_________ is maximum.","choices":[{"text":"Copper","value":"A"},{"text":"Glass","value":"B"},{"text":"Iron","value":"C"},{"text":"Aluminum","value":"D"},{"value":"E"}],"correctAnswer":3}]