[{"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":120032,"question":"The energy of the 4th orbit in hydrogen atom is","choices":[{"text":"2.5 ev","value":"A"},{"text":"- 3.5 ev","value":"B"},{"text":"-0.85 ev","value":"C"},{"text":"-13.6 ev","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":120030,"question":"Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of","choices":[{"text":"photoelectric effect","value":"A"},{"text":"pair production","value":"B"},{"text":"Compton effect","value":"C"},{"text":"uncertainty principle","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":120029,"question":"de-Broglies hypthesis was experimentally verified by","choices":[{"text":"Maxwell","value":"A"},{"text":"Compton","value":"B"},{"text":"Einstein","value":"C"},{"text":"Davison and Germer","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":120026,"question":"G.P. Thomson observer experimentally that electrons and neutrons possess","choices":[{"text":"particle-like properties","value":"A"},{"text":"wave-like properties","value":"B"},{"text":"neither particle nor wave like properties","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120025,"question":"Davision and Germer performed experiment to verify","choices":[{"text":"de-Brogile hypothesis","value":"A"},{"text":"theory of relativity","value":"B"},{"text":"Newton's law of gravitation","value":"C"},{"text":"Mass-energy relation","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":120024,"question":"Wave nature of particle was proposed by","choices":[{"text":"Einstein","value":"A"},{"text":"Plank","value":"B"},{"text":"De-Brogile","value":"C"},{"text":"Max well","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":120023,"question":"Momentum is a parameter associated with","choices":[{"text":"wave motion","value":"A"},{"text":"particle motion","value":"B"},{"text":"neither wave nor particle motion","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120022,"question":"With the help of 50 K v electron microscope, a resolution of","choices":[{"text":"0.5 to 1 m to possible","value":"A"},{"text":"1 m to 10 m is possible","value":"B"},{"text":"0.5 to 1 nm is possible","value":"C"},{"text":"1 to 10 nm is possible","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":120021,"question":"Which of the following phenomenon proves the particle nature of light","choices":[{"text":"interference","value":"A"},{"text":"diffraction","value":"B"},{"text":"photoelectric effect","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":120020,"question":"An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is","choices":[{"text":"1.66 x 10<sup>-29</sup>m","value":"A"},{"text":"1.74 x 10<sup>-10</sup>cm","value":"B"},{"text":"17.4 x 10<sup>-6</sup>m","value":"C"},{"text":"1.74 x 10<sup>-10</sup>m","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":120019,"question":"A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is","choices":[{"text":"1.66 m","value":"A"},{"text":"1.66 x 10<sup>-10</sup>m","value":"B"},{"text":"1.66 x 10<sup>-29</sup>cm","value":"C"},{"text":"1.66 x 10<sup>-29</sup>m","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":120017,"question":"Victor de-Brogile received the Nobel prize in physics in","choices":[{"text":"1925","value":"A"},{"text":"1929","value":"B"},{"text":"1932","value":"C"},{"text":"1935","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120015,"question":"0.1 kg mass will be equivalent to the energy","choices":[{"text":"9 x 10<sup>15</sup>J","value":"A"},{"text":"5 x 10<sup>8</sup>J","value":"B"},{"text":"6 x 10<sup>16</sup>J","value":"C"},{"text":"9 x 10<sup>-16</sup>J","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":120014,"question":"The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is","choices":[{"text":"100 J","value":"A"},{"text":"1.6 x 10<sup>-17</sup>J","value":"B"},{"text":"100 eV","value":"C"},{"text":"1.6 x 10<sup>-17</sup>eV","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120013,"question":"According to the de-Brogile relation, an object of large mass and ordinary speed has","choices":[{"text":"very small wavelength","value":"A"},{"text":"very large wavelength","value":"B"},{"text":"very small frequency","value":"C"},{"text":"all of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":120012,"question":"Photocell is a device which converts","choices":[{"text":"chemical energy into electrical energy","value":"A"},{"text":"electrical energy into light energy","value":"B"},{"text":"heat energy into electrical energy","value":"C"},{"text":"light energy into electrical energy","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":120011,"question":"In process of annihilation of matter, the two photons produced move in opposite direction to converse","choices":[{"text":"momentum","value":"A"},{"text":"charge","value":"B"},{"text":"energy","value":"C"},{"text":"mass","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":120002,"question":"Pair production is the phenomenon in which","choices":[{"text":"matter is converted into energy","value":"A"},{"text":"energy is converted into matter","value":"B"},{"text":"light is converted into electrical energy","value":"C"},{"text":"electrical energy is converted into light","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":120000,"question":"Position was discovered by Carl Anderson in","choices":[{"text":"1920","value":"A"},{"text":"1925","value":"B"},{"text":"1928","value":"C"},{"text":"1932","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":119998,"question":"The existence of position was predicted by Dirace in","choices":[{"text":"1920","value":"A"},{"text":"1925","value":"B"},{"text":"1930","value":"C"},{"text":"1928","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":119997,"question":"When a position comes close to an electron they annihilate into photons such that","choices":[{"text":"each photon has energy 0.51 Me v","value":"A"},{"text":"each photon has energy 1.02 Me v","value":"B"},{"text":"each photon has energy 0.25 Me v","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":119994,"question":"When a position comes close to an electron they annihilate into","choices":[{"text":"one photon","value":"A"},{"text":"two photons which travel in the same direction","value":"B"},{"text":"two photons which travels in the opposite direction","value":"C"},{"text":"two photons which travel in any direction","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":119992,"question":"Converse of pair production is known as","choices":[{"text":"Compton effect","value":"A"},{"text":"annihilation of matter","value":"B"},{"text":"photoelectric effect","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":119990,"question":"In order to produce pair production, a photon must have a energy","choices":[{"text":"0.511 Me v","value":"A"},{"text":"0.256 Me v","value":"B"},{"text":"1.02 Me v","value":"C"},{"text":"0.956 Me v","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":119988,"question":"If the radius of first orbit of hydrogen atom is 0.53<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">° A the radius of second orbit will be</span>","choices":[{"text":"2.120<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°A</span>","value":"A"},{"text":"0.212<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°A</span>","value":"B"},{"text":"21.2<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°A</span>","value":"C"},{"text":"0.14<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span><div><span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">a</span></div>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":119986,"question":"When a high energy photon interact with a metal, which of the following effect is most likely to be taken place","choices":[{"text":"pair production","value":"A"},{"text":"photoelectric effect","value":"B"},{"text":"Compton effect","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":119985,"question":"When low energy photon interact with a metal,which of the following effect is likely to be taken place","choices":[{"text":"pair production","value":"A"},{"text":"photoelectric","value":"B"},{"text":"Compton effect","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2}]