[{"id":120039,"question":"When radioactive nucleus emits a<span style=\"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;\">β-particle, the proton-neutron ratio</span>","choices":[{"text":"decrease","value":"A"},{"text":"increase","value":"B"},{"text":"same","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120038,"question":"Phenomenon of radioactivity is due to disintegration of","choices":[{"text":"nucleus","value":"A"},{"text":"neutron","value":"B"},{"text":"proton","value":"C"},{"text":"molecule","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":120037,"question":"A curie represents a very strong source of","choices":[{"text":"<span style=\"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;\">α-particle</span>","value":"A"},{"text":"<span style=\"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;\">β-particle</span>","value":"B"},{"text":"<span style=\"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;\">γ-particle</span>","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":120035,"question":"The rate of decay of radioactive substance","choices":[{"text":"is constant","value":"A"},{"text":"decrease exponentially with time","value":"B"},{"text":"varies inversely as time","value":"C"},{"text":"decreases linearly with time","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":119548,"question":"If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by","choices":[{"text":"-4","value":"A"},{"text":"4","value":"B"},{"text":"2","value":"C"},{"text":"1","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111338,"question":"An alpha particle has a charge of","choices":[{"text":"+2e","value":"A"},{"text":"-2e","value":"B"},{"text":"-e","value":"C"},{"text":"+3e","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111337,"question":"When a nucleus emits an alpha particles, its charge number decreases by","choices":[{"text":"3","value":"A"},{"text":"2","value":"B"},{"text":"6","value":"C"},{"text":"5","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111336,"question":"When a nucleus emits an alpha particle, it atomic mass decreased by","choices":[{"text":"2","value":"A"},{"text":"1","value":"B"},{"text":"4","value":"C"},{"text":"3","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111335,"question":"Radioactivity is","choices":[{"text":"self disruptive activity","value":"A"},{"text":"spontaneous activity","value":"B"},{"text":"exhibited by all elements under proper conditions","value":"C"},{"text":"both 'a' and 'b'","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111334,"question":"Curie is a unit of","choices":[{"text":"reluctance","value":"A"},{"text":"resistivity","value":"B"},{"text":"binding energy","value":"C"},{"text":"radioactivity","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111333,"question":"Alfa , beta and gamma rays are emitted from a radio-active substance","choices":[{"text":"spontaneously","value":"A"},{"text":"when it is heated","value":"B"},{"text":"when it is exposed to light","value":"C"},{"text":"When it interacts with the other particle","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111332,"question":"Gamma rays consist of steam of","choices":[{"text":"electron","value":"A"},{"text":"proton","value":"B"},{"text":"photons","value":"C"},{"text":"all of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111331,"question":"Alfa particles are","choices":[{"text":"hydrogen nuclei","value":"A"},{"text":"helium nuclei","value":"B"},{"text":"electrons","value":"C"},{"text":"photons","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111330,"question":"Beta particles are","choices":[{"text":"hydrogen nuclei","value":"A"},{"text":"helium nuclei","value":"B"},{"text":"electrons","value":"C"},{"text":"photons","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111329,"question":"Maric Curie and Pieree Curie discovered two new radioactive elements, which are called","choices":[{"text":"polonium uranium","value":"A"},{"text":"uranium and radium","value":"B"},{"text":"polonium and radium","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111327,"question":"Radioactivity was discovered by","choices":[{"text":"Rutherford","value":"A"},{"text":"Henri Becqureal","value":"B"},{"text":"Maxwell","value":"C"},{"text":"James Chadwick","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111326,"question":"Radioactivity","choices":[{"text":"is exhibited more by semiconductors in general","value":"A"},{"text":"in exhibited more by the element when they are coupled","value":"B"},{"text":"with other radioactive elements by a covalent bond","value":"C"},{"text":"is an atomic property of radioactive elements","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111325,"question":"Binding energy per nucleus is","choices":[{"text":"greater for heavy nucleus","value":"A"},{"text":"least for heavy nucleus","value":"B"},{"text":"greatest for light nuclei","value":"C"},{"text":"decreases for medium weight niclei","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111324,"question":"The amount of energy equivalent to 1 a.m.u is","choices":[{"text":"9.315 Mev","value":"A"},{"text":"93.15 Mev","value":"B"},{"text":"931.5 Mev","value":"C"},{"text":"2.22 Mev","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111323,"question":"The energy is found from Einstein's mass energy relation is called","choices":[{"text":"binding energy of electron","value":"A"},{"text":"binding energy of proton","value":"B"},{"text":"binding energy of neutron","value":"C"},{"text":"binding energy of nucleus","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111322,"question":"The missing mass which is converted to energy in the formation of nucleus, is called","choices":[{"text":"packing fraction","value":"A"},{"text":"mass defect","value":"B"},{"text":"binding energy","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111321,"question":"The energy acquired by a mass of 1g moving with the speed of light is","choices":[{"text":"3 x 10<sup>8</sup>J","value":"A"},{"text":"9 x 10<sup>13</sup>J","value":"B"},{"text":"3 x 10<sup>13</sup>J","value":"C"},{"text":"9 x 10<sup>16</sup>J","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111320,"question":"If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be","choices":[{"text":"Equal to 1","value":"A"},{"text":"Less than 1","value":"B"},{"text":"Greater than 1","value":"C"},{"text":"Infinity","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111319,"question":"1 amu is equal to.","choices":[{"text":"1.66 x 10<sup>-24</sup>kg","value":"A"},{"text":"1.66 x 10<sup>-19</sup>kg","value":"B"},{"text":"1.66 x 10<sup>-24</sup>kg","value":"C"},{"text":"1.66 x 10<sup>-27</sup>kg","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111318,"question":"The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called","choices":[{"text":"nuclear fission","value":"A"},{"text":"nuclear fusion","value":"B"},{"text":"man defect","value":"C"},{"text":"radioactivity","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111317,"question":"Neon gas have three isotopes whose atomic numbers are","choices":[{"text":"20, 24 , 23","value":"A"},{"text":"20, 21 , 22","value":"B"},{"text":"20, 19 , 21","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111315,"question":"The most abundant isotope of neon is","choices":[{"text":"neon-20","value":"A"},{"text":"neon-21","value":"B"},{"text":"neon-22","value":"C"},{"text":"neon-23","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111314,"question":"A mass spectrograph sort out","choices":[{"text":"molecules","value":"A"},{"text":"atoms","value":"B"},{"text":"elements","value":"C"},{"text":"isotopes","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111313,"question":"The chemical properties of an element depends upon the number of","choices":[{"text":"electron","value":"A"},{"text":"position","value":"B"},{"text":"photons","value":"C"},{"text":"neutrons","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111312,"question":"The chemical properties of all the isotopes of an elements are","choices":[{"text":"same","value":"A"},{"text":"different","value":"B"},{"text":"slightly different","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1}]