[{"id":15649,"question":"The average binding energy of a nucleon inside an atomic nucleus is about","choices":[{"text":"&nbsp;8 MeV","value":"A"},{"text":"8 eV","value":"B"},{"text":"8 Joules","value":"C"},{"text":"8 ergs","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15648,"question":"The de broglie wave corresponding to a particle of mass m and velocity v has a wavelength associated with it","choices":[{"text":"h/mv","value":"A"},{"text":"hm v","value":"B"},{"text":"mh/v","value":"C"},{"text":"m/hv","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15647,"question":"The structure of solids is investigated by using","choices":[{"text":"Cosmic Rays","value":"A"},{"text":"X-rays","value":"B"},{"text":"Intra red Radiation","value":"C"},{"text":"y-rays","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15646,"question":"The half life of a radio-isotope is 5 years The fraction of atoms decayed in this substance after 15 years will be","choices":[{"text":"1","value":"A"},{"text":"3/4","value":"B"},{"text":"7/8","value":"C"},{"text":"5/8","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15645,"question":"As the electron in Bohr orbit of hydrogen atom passes from stat n = 2 to n = 1 the kinetic energy K and potential energy U change as","choices":[{"text":"K two-fold,U also two-fold","value":"A"},{"text":"K four-fold,U also four-fold","value":"B"},{"text":"K four-fold,U two-fold","value":"C"},{"value":"D"},{"value":"E"}],"correctAnswer":3},{"id":15644,"question":"When a hydrogen atom is bombarded the atom is excited to the n = 4 state of hydrogen atom.The energy released when the atom falls from n = 4 state to the ground state is","choices":[{"text":"1.275 eV","value":"A"},{"text":"12.75 eV","value":"B"},{"text":"5 eV","value":"C"},{"text":"8 eV","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15643,"question":"The mass defect for the nucleus of helium is 0.0303 a.m.u What is the binding energy per nucleon for helium in MeV?","choices":[{"text":"28","value":"A"},{"text":"7","value":"B"},{"text":"4","value":"C"},{"text":"1","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15642,"question":"The nucleus 6C12 absorbs an energetic neutron and emits a beta particle (β) The resulting nucleus is","choices":[{"text":"<sub>7</sub>N<sup>14</sup>","value":"A"},{"text":"<sub>5</sub><span style=\"font-size: 14.44444465637207px;\">B</span><sup>13</sup>","value":"B"},{"text":"<sub>7</sub><span style=\"font-size: 14.44444465637207px;\">N</span><sup>13</sup>","value":"C"},{"text":"<sub>6</sub><span style=\"font-size: 14.44444465637207px;\">N</span><sup>13</sup>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15641,"question":"Electrons in the atom are held in the atom due to","choices":[{"text":"Coulomb forces","value":"A"},{"text":"Nuclear forces","value":"B"},{"text":"Gravitational forces","value":"C"},{"text":"Van der Waal's forces","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15640,"question":"In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie","choices":[{"text":"Ultraviolet","value":"A"},{"text":"Infra red","value":"B"},{"text":"Visible","value":"C"},{"text":"X-ray","value":"D"},{"value":"E"}],"correctAnswer":1}]