[{"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},{"id":119984,"question":"Compton was awarded Nobel prize in physics in","choices":[{"text":"1921","value":"A"},{"text":"1923","value":"B"},{"text":"1925","value":"C"},{"text":"1927","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":119983,"question":"In the compton's effect, it is found that the wavelength of incident x-rays is","choices":[{"text":"greater than the wavelength of scattered x-rays","value":"A"},{"text":"equal to the wavelength of scattered x-rays","value":"B"},{"text":"less than the wavelength of scattered x-rays","value":"C"},{"text":"any one of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":119547,"question":"Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in","choices":[{"text":"1916","value":"A"},{"text":"1919","value":"B"},{"text":"1921","value":"C"},{"text":"1923","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111279,"question":"According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the","choices":[{"text":"number of photoelectrons","value":"A"},{"text":"size of the photoelectrons","value":"B"},{"text":"charge on photoelectrons","value":"C"},{"text":"K.E of photoelectrons","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111278,"question":"As the light shines on the metal surface, the electrons are ejected","choices":[{"text":"slowly","value":"A"},{"text":"instantaneously","value":"B"},{"text":"either of these","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111277,"question":"The value of threshold frequency for different metals is","choices":[{"text":"different","value":"A"},{"text":"same","value":"B"},{"text":"may be different or may be same","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111276,"question":"There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as","choices":[{"text":"maximum frequency","value":"A"},{"text":"minimum frequency","value":"B"},{"text":"threshold frequency","value":"C"},{"text":"all of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111275,"question":"The photoelectric effect, the maximum energy of photoelectrons depends on the","choices":[{"text":"particular metal surface","value":"A"},{"text":"frequency of incident light","value":"B"},{"text":"both of them","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111274,"question":"When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called","choices":[{"text":"thermoionic electrons","value":"A"},{"text":"free electrons","value":"B"},{"text":"photoelectrons","value":"C"},{"text":"slow electrons","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111273,"question":"The emission of electrons from a metal surface when exposed to light of suitable frequency is called the","choices":[{"text":"pair production","value":"A"},{"text":"Compton effect","value":"B"},{"text":"photoelectric effect","value":"C"},{"text":"relativity","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111272,"question":"Electromagnetic radiation or photons interact with matter in","choices":[{"text":"two distinct ways","value":"A"},{"text":"three distinct ways","value":"B"},{"text":"four distinct ways","value":"C"},{"text":"five distinct ways","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111271,"question":"The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by","choices":[{"text":"Max plank","value":"A"},{"text":"Newton","value":"B"},{"text":"Einstein","value":"C"},{"text":"J.J. Thomson","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111270,"question":"The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as","choices":[{"text":"classical mechanics","value":"A"},{"text":"Newtonian mechanics","value":"B"},{"text":"quantum mechanics","value":"C"},{"text":"statistical mechanics","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111269,"question":"The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is","choices":[{"text":"100 ev","value":"A"},{"text":"10<sup>6</sup>e v","value":"B"},{"text":"10<sup>3</sup>e v","value":"C"},{"text":"1.0 e v","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111268,"question":"The photon of radio-waves has energy of about","choices":[{"text":"1 Me V","value":"A"},{"text":"1 Ke v","value":"B"},{"text":"10<sup>-10</sup>e v","value":"C"},{"text":"10<sup>10</sup>e v","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111267,"question":"From the theory of relativity, momentum p of the photon is related to energy as","choices":[{"text":"p = hfc","value":"A"},{"text":"p = hf/c","value":"B"},{"text":"p = f(hc,f)","value":"C"},{"text":"p = cf/h","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111266,"question":"Max plank received the Nobel Prize in physics for his discovery of energy quanta in","choices":[{"text":"1900","value":"A"},{"text":"1906","value":"B"},{"text":"1912","value":"C"},{"text":"1918","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111265,"question":"In photoelectric effect the energy of ejected electrons depend on","choices":[{"text":"The frequency","value":"A"},{"text":"The intensity","value":"B"},{"text":"Both frequency and intensity","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111264,"question":"The value of the plank's constant 'h' is given by","choices":[{"text":"1.6 x 10<sup>-19</sup>J","value":"A"},{"text":"1.67 x 10<sup>-27</sup>Kg","value":"B"},{"text":"6.63 x 10<sup>34</sup>Js","value":"C"},{"text":"6.63 x 10<sup>-34</sup>Js","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111263,"question":"A photon is considered to have","choices":[{"text":"Momentum","value":"A"},{"text":"Energy","value":"B"},{"text":"Wavelength","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111262,"question":"S.I. unit of planks constant is","choices":[{"text":"J-s<sup>-1</sup>","value":"A"},{"text":"J.s","value":"B"},{"text":"J.s<sup>-2</sup>","value":"C"},{"text":"J.s<sup>2</sup>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111261,"question":"The energy of photon 'E' is proported to","choices":[{"text":"The magnetic field H","value":"A"},{"text":"The electric field E","value":"B"},{"text":"Both the electric and magnetic field H and E","value":"C"},{"text":"Frequency","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111260,"question":"The energy of a photon is represented by","choices":[{"text":"h/c<sup>2</sup>","value":"A"},{"text":"h/T","value":"B"},{"text":"hc<sup>2</sup>","value":"C"},{"text":"hf/c<sup>2</sup>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111259,"question":"According to the Max plank, energy is redialed or absorbed in","choices":[{"text":"discrete packets","value":"A"},{"text":"continuous waves","value":"B"},{"text":"either of them","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111258,"question":"Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in","choices":[{"text":"1890","value":"A"},{"text":"1895","value":"B"},{"text":"1900","value":"C"},{"text":"1905","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111257,"question":"The value of the Stephen's constant for black body radiations is given by","choices":[{"text":"5.6 x 10<sup>8</sup>Wm<sup>-2</sup>K<sup>-4</sup>","value":"A"},{"text":"5.67 x 10<sup>-8</sup>Wm<sup>-2</sup>K<sup>-4</sup>","value":"B"},{"text":"2.9 x 10<sup>-3</sup>mK","value":"C"},{"text":"2.9 x 10<sup>3</sup>mK","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111256,"question":"The Stephen-Boltzmann law for the black body radiation is given by","choices":[{"text":"E = T<sup>2</sup>","value":"A"},{"text":"E = -T<sup>2</sup>","value":"B"},{"text":"E = T<sup>4</sup>","value":"C"},{"text":"E = -T<sup>4</sup>","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111255,"question":"The inside cavity of the black body is","choices":[{"text":"painted white","value":"A"},{"text":"painted silver","value":"B"},{"text":"blackened with soot","value":"C"},{"text":"painted red","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111254,"question":"A black body is","choices":[{"text":"an ideal absorber","value":"A"},{"text":"an ideal radiator","value":"B"},{"text":"both of them","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":3}]