[{"id":146168,"question":"The average binding energy of a nucleus inside an atomic nucleus is about","choices":[{"text":"8 MeV","value":"A"},{"text":"8 eV","value":"B"},{"text":"8 Joules","value":"C"},{"text":"8 ergs","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":146167,"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":"<span style=\"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;\">γ-rays</span>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":146166,"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":146165,"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"},{"text":"K two fold, U four fold","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":146164,"question":"The mass of a proton is 1847 times that of an electron. An electron and a proton are projected into a uniform electric field in a direction at right angles to the direction of the field with the same initial kinetic energy.The","choices":[{"text":"Both the trajectories will be equally curved","value":"A"},{"text":"The proton trajectory will be less curved than the electron trajectory","value":"B"},{"text":"The electron trajectory will be less curved than the proton trajectory","value":"C"},{"text":"The relative curving of the trajectories will be dependent on the value of the initial kinetic energy","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":146163,"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":146162,"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":146161,"question":"The nucleus 6C12 absorbs an energetic neutron and emits a beta particle (<span style=\"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;\">β). The resulting nucleus is</span>","choices":[{"text":"<sub>7</sub>N<sup>14</sup>","value":"A"},{"text":"<sub>5</sub>B<sup>13</sup>","value":"B"},{"text":"<sub>7</sub>N<sup>13</sup>","value":"C"},{"text":"<sub>6</sub>C<sup>13</sup>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":146160,"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":146159,"question":"According to classical theory the proposed circular path of an electron in Rutherford model of atom will be","choices":[{"text":"Circular","value":"A"},{"text":"Straight line","value":"B"},{"text":"Parabolic","value":"C"},{"text":"Spiral","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":146158,"question":"In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie","choices":[{"text":"Ultraviolet","value":"A"},{"text":"Infrared","value":"B"},{"text":"Visible","value":"C"},{"text":"X-ray","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":146157,"question":"The nuclear model of atom was proposed by","choices":[{"text":"J.J Thomson","value":"A"},{"text":"E. Rutherford","value":"B"},{"text":"Neil Bohr","value":"C"},{"text":"Summerfield","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":146156,"question":"To explain his theory Bohr used","choices":[{"text":"Conservation of linear momentum","value":"A"},{"text":"Conservation of angular momentum","value":"B"},{"text":"Conservation of quantum frequency","value":"C"},{"text":"Conservation of energy","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":146155,"question":"Who explained the origin of the Fraunhoffer lines?","choices":[{"text":"Fraunhoffer","value":"A"},{"text":"Kirchhoff","value":"B"},{"text":"Fresnel","value":"C"},{"text":"Snell","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":146154,"question":"Band spectrum is produced by","choices":[{"text":"H","value":"A"},{"text":"He","value":"B"},{"text":"H<sub>2</sub>","value":"C"},{"text":"Na","value":"D"},{"value":"E"}],"correctAnswer":3}]