[{"id":111310,"question":"Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called","choices":[{"text":"deuterium","value":"A"},{"text":"protium","value":"B"},{"text":"tritium","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111309,"question":"Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called","choices":[{"text":"deuteron","value":"A"},{"text":"deterium","value":"B"},{"text":"protium","value":"C"},{"text":"tritium","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111308,"question":"How many isotopes of helium are present?","choices":[{"text":"1","value":"A"},{"text":"2","value":"B"},{"text":"3","value":"C"},{"text":"4","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111307,"question":"The number of isotopes of hydrogen are","choices":[{"text":"2","value":"A"},{"text":"1","value":"B"},{"text":"3","value":"C"},{"text":"4","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111306,"question":"Nuclei that have the same charge number but different mass number are called","choices":[{"text":"isotones","value":"A"},{"text":"isomers","value":"B"},{"text":"isotopes","value":"C"},{"text":"isobars","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111305,"question":"Electrons are","choices":[{"text":"positive charged","value":"A"},{"text":"negatively charged","value":"B"},{"text":"massless","value":"C"},{"text":"neutral","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111304,"question":"Neutrons are","choices":[{"text":"positive charge","value":"A"},{"text":"negatively charged","value":"B"},{"text":"massless","value":"C"},{"text":"neutral","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111303,"question":"The diameter of an atom is of the order","choices":[{"text":"10<sup>-125</sup>m","value":"A"},{"text":"10<sup>-11</sup>m","value":"B"},{"text":"10<sup>-10</sup>m","value":"C"},{"text":"10<sup>-9</sup>m","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111302,"question":"Structure of the nucleus was explained by","choices":[{"text":"J.J Thomson","value":"A"},{"text":"Bohr","value":"B"},{"text":"Millikan","value":"C"},{"text":"Rutherford","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111301,"question":"Charge on proton is","choices":[{"text":"1.59 x 10<sup>-9</sup>C","value":"A"},{"text":"1.59 x 10<sup>-7</sup>C","value":"B"},{"text":"-1.59 x 10<sup>-19 </sup>C","value":"C"},{"text":"1.59 x 10<sup>-19</sup>C","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111300,"question":"Mass of proton is of order of","choices":[{"text":"10<sup>-31</sup>gm","value":"A"},{"text":"10<sup>-27</sup>kg","value":"B"},{"text":"10<sup>-24</sup>gm","value":"C"},{"text":"10<sup>+27</sup>kg","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111299,"question":"The number if neutrons in the nucleus of <sub>92</sub>U<sup>235</sup>are","choices":[{"text":"Infinite","value":"A"},{"text":"92","value":"B"},{"text":"235","value":"C"},{"text":"143","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111298,"question":"For an atom having atomic number Z and atomic weight A, the number of electron in an atoms","choices":[{"text":"A - 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