[{"id":158943,"question":"Three quarks make:","choices":[{"text":"An electron","value":"A"},{"text":"A meson","value":"B"},{"text":"A baryon","value":"C"},{"text":"A photon","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":158942,"question":"A pair of quark and antiquark makes a:","choices":[{"text":"Meson","value":"A"},{"text":"Baryon","value":"B"},{"text":"Proton","value":"C"},{"text":"Neutron","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158941,"question":"Which are not the elementary particles?","choices":[{"text":"Photons","value":"A"},{"text":"Leptons","value":"B"},{"text":"Hadrons","value":"C"},{"text":"Quarks","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":158940,"question":"U-238 present in the natural uranium is about:","choices":[{"text":"59%","value":"A"},{"text":"0.007%","value":"B"},{"text":"99%","value":"C"},{"text":"39%","value":"D"},{"text":"19%","value":"E"}],"correctAnswer":3},{"id":158939,"question":"Heavy water is made of one oxygen atom and two atoms of:","choices":[{"text":"Protium","value":"A"},{"text":"Deuterium","value":"B"},{"text":"Tritium","value":"C"},{"text":"Any of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158938,"question":"Examples of moderators used in a fission reactor is/are:","choices":[{"text":"Water","value":"A"},{"text":"Heavy water","value":"B"},{"text":"Carbon","value":"C"},{"text":"Hydrocarbon","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":5},{"id":158937,"question":"There is present in paraffin a large amount of:","choices":[{"text":"Nitrogen","value":"A"},{"text":"Hydrogen","value":"B"},{"text":"Carbon","value":"C"},{"text":"Baryllium","value":"D"},{"text":"Lithium","value":"E"}],"correctAnswer":2},{"id":158936,"question":"A mass difference of 0.0012 u is equivalent to and energy of:","choices":[{"text":"0.5 Me V","value":"A"},{"text":"1.13 MeV","value":"B"},{"text":"5.13 MeV","value":"C"},{"text":"1.13 keV","value":"D"},{"text":"1.13 eV","value":"E"}],"correctAnswer":2},{"id":158935,"question":"In his experiment on nuclear reactions, Rutherford bombardedα particles on:","choices":[{"text":"Nitrogen","value":"A"},{"text":"Hydrogen","value":"B"},{"text":"Lead","value":"C"},{"text":"Oxygen","value":"D"},{"text":"Krypton","value":"E"}],"correctAnswer":1},{"id":158934,"question":"Rutherford performed an experiment on nuclear reactions in:","choices":[{"text":"1718 A.D","value":"A"},{"text":"1818 A.D","value":"B"},{"text":"1918 A.D","value":"C"},{"text":"2001 A.D.","value":"D"},{"text":"1701 A.D.","value":"E"}],"correctAnswer":3},{"id":158933,"question":"The counter, which also provides the power to the G.M. tube is called:","choices":[{"text":"Thin mica window","value":"A"},{"text":"thin glass window","value":"B"},{"text":"Airy window","value":"C"},{"text":"Wooden window","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158932,"question":"In wilson cloud chamber, the air becomes saturated with:","choices":[{"text":"Alcohol vapours","value":"A"},{"text":"Water","value":"B"},{"text":"Helium gas","value":"C"},{"text":"Nitrogen gas","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158931,"question":"The unit of decay constant is:","choices":[{"text":"Second","value":"A"},{"text":"Metre","value":"B"},{"text":"Hour","value":"C"},{"text":"Year","value":"D"},{"text":"Second<sup>-1</sup>","value":"E"}],"correctAnswer":5},{"id":158930,"question":"The reciprocal of decay constant λ of a radioactive material is:","choices":[{"text":"Frequency","value":"A"},{"text":"Half life","value":"B"},{"text":"Year","value":"C"},{"text":"Mean life","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158929,"question":"Rate of decay is actually described by.","choices":[{"text":"Half line","value":"A"},{"text":"Decay constant","value":"B"},{"text":"Mean life","value":"C"},{"text":"Total life","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158928,"question":"When thorium nucleus emits aβ-particle, the daughter nucleus is called:","choices":[{"text":"Protactinium","value":"A"},{"text":"Actinium","value":"B"},{"text":"Uranium","value":"C"},{"text":"Radium","value":"D"},{"text":"Redon","value":"E"}],"correctAnswer":1},{"id":158927,"question":"When certain nucleus emits aβ-particles, is mass number:","choices":[{"text":"Remain same","value":"A"},{"text":"Increases by one","value":"B"},{"text":"Decreases by one","value":"C"},{"text":"Decreases by four","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158926,"question":"When certain nucleus emits anα particle, its mass number:","choices":[{"text":"Increases by one","value":"A"},{"text":"Decreases by one","value":"B"},{"text":"Remain same","value":"C"},{"text":"Decreases by four","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158925,"question":"During the nuclear changes, the law/s of conservation that hold/s are that of:","choices":[{"text":"Charge","value":"A"},{"text":"energy","value":"B"},{"text":"Momentum","value":"C"},{"text":"Mass","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":5},{"id":158924,"question":"The nucleus left after the emission of some radiation is called:","choices":[{"text":"Parent nucleus","value":"A"},{"text":"Daughter necleus","value":"B"},{"text":"Mother necleus","value":"C"},{"text":"Any of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158923,"question":"Marie curie and Pierre curie discovered:","choices":[{"text":"Uranium","value":"A"},{"text":"Polonium","value":"B"},{"text":"Radium","value":"C"},{"text":"Both (A) and (C)","value":"D"},{"text":"Plutonium","value":"E"}],"correctAnswer":4},{"id":158922,"question":"Radium was discovered by:","choices":[{"text":"Becquerel","value":"A"},{"text":"Marie curie","value":"B"},{"text":"Pierre curie","value":"C"},{"text":"Rutherford","value":"D"},{"text":"Both (B) and (C)","value":"E"}],"correctAnswer":5},{"id":158921,"question":"Radioactivity was discovered by:","choices":[{"text":"Becquerel","value":"A"},{"text":"Marie curie","value":"B"},{"text":"Pierre curie","value":"C"},{"text":"All of them","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158920,"question":"Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:","choices":[{"text":"50","value":"A"},{"text":"100","value":"B"},{"text":"150","value":"C"},{"text":"200","value":"D"},{"text":"250","value":"E"}],"correctAnswer":1},{"id":158919,"question":"Referring to the above figure, we can say that of all the elements, the most stable element is","choices":[{"text":"Phosphours","value":"A"},{"text":"Iron","value":"B"},{"text":"uranium","value":"C"},{"text":"Lithium","value":"D"},{"text":"Bismuth","value":"E"}],"correctAnswer":2},{"id":158918,"question":"For Protium, the mass defect is:","choices":[{"text":"Infinite","value":"A"},{"text":"Zero","value":"B"},{"text":"Very large","value":"C"},{"text":"A few grams","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158917,"question":"The nucleus/nuclei of hydrogen is/are:","choices":[{"text":"Proton","value":"A"},{"text":"Deuteron","value":"B"},{"text":"Triton","value":"C"},{"text":"All of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158916,"question":"The isotope/s of hydrogen is /are:","choices":[{"text":"Protium","value":"A"},{"text":"Deuterium","value":"B"},{"text":"Tritium","value":"C"},{"text":"Both (A) and (B)","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":5},{"id":158915,"question":"The nuclei of an element having the same charge number but different mass numbers are called:","choices":[{"text":"Isobars","value":"A"},{"text":"Isotopes","value":"B"},{"text":"Isomers","value":"C"},{"text":"Isobaric","value":"D"},{"text":"Isothermal","value":"E"}],"correctAnswer":2},{"id":158914,"question":"Nucleus of a hydrogen atom may contain:","choices":[{"text":"One neutron only","value":"A"},{"text":"Two protons and one neutron","value":"B"},{"text":"Two protons and two neutrons","value":"C"},{"text":"Aany of above","value":"D"},{"text":"One proton only","value":"E"}],"correctAnswer":5}]