[{"id":120062,"question":"The distance travelled by<span style=\"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;\">α-particle in a medium before coming to rest, is called</span>","choices":[{"text":"range of<span style=\"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;\">γ-particle</span>","value":"A"},{"text":"range of neutrons","value":"B"},{"text":"range of particle","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":120061,"question":"Which of the following material has smaller has life","choices":[{"text":"uranium","value":"A"},{"text":"polonium","value":"B"},{"text":"radium","value":"C"},{"text":"radian","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":120060,"question":"Which of the following material has longer half life","choices":[{"text":"radium","value":"A"},{"text":"polonium","value":"B"},{"text":"radium","value":"C"},{"text":"uranium","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":120058,"question":"The half life of uranium-238 is","choices":[{"text":"6.2 x 10<sup>9</sup>years","value":"A"},{"text":"4.5 x 10<sup>9</sup>days","value":"B"},{"text":"4.5 x 10<sup>9</sup>years","value":"C"},{"text":"1.3 x 10<sup>6</sup>years","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":120057,"question":"The half lie of radium-226 is","choices":[{"text":"238 years","value":"A"},{"text":"4.5 x 10<sup>9</sup>days","value":"B"},{"text":"1620 years","value":"C"},{"text":"332 years","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":120056,"question":"The unit of decay constant is","choices":[{"text":"sex","value":"A"},{"text":"sec<sup>2</sup>","value":"B"},{"text":"sec<sup>-1</sup>","value":"C"},{"text":"sec<sup>-2</sup>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":120055,"question":"Fraction of the decaying atoms per unit time is called","choices":[{"text":"decay atom","value":"A"},{"text":"decay element","value":"B"},{"text":"decay constant","value":"C"},{"text":"decay","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120053,"question":"In radioactive decay, the new element which is formed due to the disintegration of original element is called","choices":[{"text":"element","value":"A"},{"text":"daughter element","value":"B"},{"text":"parent element","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120052,"question":"In radio-active decay, the original element which disintegrate to another element is called","choices":[{"text":"element","value":"A"},{"text":"daughter element","value":"B"},{"text":"parent element","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120051,"question":"The emission of radiations take place in elements, having charge number greater than","choices":[{"text":"109","value":"A"},{"text":"82","value":"B"},{"text":"69","value":"C"},{"text":"52","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120048,"question":"The time required for a radioactive material to decrease in active by one half is called","choices":[{"text":"half time","value":"A"},{"text":"half life","value":"B"},{"text":"disintegration time","value":"C"},{"text":"mean life","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120047,"question":"The half life of radioactive substances depends upon","choices":[{"text":"amount of substance","value":"A"},{"text":"energy of substance","value":"B"},{"text":"state of substance","value":"C"},{"text":"temperature of substance","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":120044,"question":"Different radioactive material have","choices":[{"text":"same half lives","value":"A"},{"text":"different half lives","value":"B"},{"text":"same mean lives","value":"C"},{"text":"same total lives","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120043,"question":"The rate of decay of a radioactive substance","choices":[{"text":"decrease exponentially with time","value":"A"},{"text":"decreases linearly with time","value":"B"},{"text":"increases linearly with time","value":"C"},{"text":"increases exponentially with time","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":120042,"question":"After alpha decay the atomic number of the atom","choices":[{"text":"increase by four","value":"A"},{"text":"decreases by two","value":"B"},{"text":"increases by two","value":"C"},{"text":"decrease by four","value":"D"},{"value":"E"}],"correctAnswer":3}]