[{"id":170465,"question":"<p class=\"MsoNormal\">When we double the voltage in a simple electric circuit, we\r\ndouble the:<o:p></o:p></p>","choices":[{"text":"<p class=\"MsoNormal\">Current<o:p></o:p></p>","value":"A"},{"text":"<p class=\"MsoNormal\">Power<o:p></o:p></p>","value":"B"},{"text":"<p class=\"MsoNormal\">Resistance<o:p></o:p></p>","value":"C"},{"text":"<p class=\"MsoNormal\">Both a and b<o:p></o:p></p>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":166475,"question":"The half life of radium 226 is","choices":[{"text":"1600 year","value":"A"},{"text":"1610 years","value":"B"},{"text":"1620 years","value":"C"},{"text":"1630 years","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":166474,"question":"For observing how fast plants are absorbing phosphate fertilizer we use.","choices":[{"text":"I.131","value":"A"},{"text":"Ph -32","value":"B"},{"text":"Co-60","value":"C"},{"text":"Ar-40","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":166472,"question":"The half of carbon 14 is","choices":[{"text":"5720 years","value":"A"},{"text":"5730 years","value":"B"},{"text":"5740 years","value":"C"},{"text":"5750 years","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":166471,"question":"Radioactive isotopes present in atmosphere is","choices":[{"text":"Cobalt -60","value":"A"},{"text":"Ph-32","value":"B"},{"text":"Carbon -14","value":"C"},{"text":"Carbon -20","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":166470,"question":"Nuclear fission was first observed in","choices":[{"text":"1936","value":"A"},{"text":"1937","value":"B"},{"text":"1938","value":"C"},{"text":"1939","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":166469,"question":"When 1 tonne of coal is burnt then amount of energy is released .","choices":[{"text":"36 x 10<sup>8</sup> J","value":"A"},{"text":"36 x 10<sup>9</sup>J","value":"B"},{"text":"36 J","value":"C"},{"text":"36 x 10<sup>10</sup>J","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":166468,"question":"When 1 kg of Uranium -235 is fused then energy released is","choices":[{"text":"67 x 10<sup>10</sup> J","value":"A"},{"text":"67 x 10<sup>7</sup>J","value":"B"},{"text":"67 J","value":"C"},{"text":"7 J","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":166467,"question":"The half -life of carbon is","choices":[{"text":"5730 years","value":"A"},{"text":"5700 years","value":"B"},{"text":"5720 years","value":"C"},{"text":"572 years","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":166466,"question":"The half life of Lead Pb is","choices":[{"text":"10 hour","value":"A"},{"text":"10.10 hours","value":"B"},{"text":"10.6 hours","value":"C"},{"text":"1 year","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":166465,"question":"The temperature at the centre of sun is.","choices":[{"text":"10 million k","value":"A"},{"text":"20 million k","value":"B"},{"text":"30 million k","value":"C"},{"text":"35 million k","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":166464,"question":"The reason carbon dating work is that.","choices":[{"text":"Plants and animals are such strong emitters of carbon 14","value":"A"},{"text":"After a plant or animal dies, it stops in fresh carbon","value":"B"},{"text":"There is so much non radioactive carbon dioxide in the air","value":"C"},{"text":"When a plant or animal dies.","value":"D"},{"value":"E"}],"correctAnswer":3}]