[{"id":158828,"question":"The positron was discovered by:","choices":[{"text":"In cosmic radiation","value":"A"},{"text":"In 1932","value":"B"},{"text":"By Carl Anderson","value":"C"},{"text":"All above","value":"D"},{"text":"By direc","value":"E"}],"correctAnswer":4},{"id":158827,"question":"A particle having mass and charge equal to that of an electron is called:","choices":[{"text":"Proton","value":"A"},{"text":"Positron","value":"B"},{"text":"Pion","value":"C"},{"text":"Pi-meson","value":"D"},{"text":"Both (C) and (D)","value":"E"}],"correctAnswer":2},{"id":158826,"question":"Photoelectric effect takes place with a photon of:","choices":[{"text":"Very high energy","value":"A"},{"text":"Very low energy","value":"B"},{"text":"Low energy","value":"C"},{"text":"High energy","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158825,"question":"Compton shift refers to:","choices":[{"text":"Photon","value":"A"},{"text":"Meson","value":"B"},{"text":"Proton","value":"C"},{"text":"Positron","value":"D"},{"text":"Both (B) and (D)","value":"E"}],"correctAnswer":1},{"id":158823,"question":"The year when A.H. compton was awarded Nobel Prize is:","choices":[{"text":"1923","value":"A"},{"text":"1927","value":"B"},{"text":"1931","value":"C"},{"text":"1935","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158822,"question":"Compton derived an expression to find compton shift by applying to the process, the law of conservation of:","choices":[{"text":"Energy only","value":"A"},{"text":"Momentum only","value":"B"},{"text":"Mass only","value":"C"},{"text":"Charge only","value":"D"},{"text":"Both (A) and (B)","value":"E"}],"correctAnswer":5},{"id":158820,"question":"Compton studied the scattering of x-rays by loosely bound electrons from:","choices":[{"text":"NaCl crystal","value":"A"},{"text":"Graphite crystal","value":"B"},{"text":"Zirconia","value":"C"},{"text":"Copper crystal","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158818,"question":"The threshold frequency of sodium is 6 x 10<sup>6</sup>MHz. The cut-off wavelength for this metal will be","choices":[{"text":"500 m","value":"A"},{"text":"500 nm","value":"B"},{"text":"500 km","value":"C"},{"text":"500 cm","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158817,"question":"The unit of work function is:","choices":[{"text":"Joule","value":"A"},{"text":"Electron volt","value":"B"},{"text":"That of threshold frequency","value":"C"},{"text":"Both (A) and (B)","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158816,"question":"Photoelectrons are emitted when ultraviolet light falls on:","choices":[{"text":"Casium","value":"A"},{"text":"Silver","value":"B"},{"text":"Potassium","value":"C"},{"text":"Any of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":5},{"id":158814,"question":"The Nobel Prize on the explanation of photoelectric effect was awarded to:","choices":[{"text":"Max. Planck","value":"A"},{"text":"Maxwell","value":"B"},{"text":"Bohr","value":"C"},{"text":"Rutherford","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":5},{"id":158812,"question":"The idea of quantization of energy was proposed by:","choices":[{"text":"Einstein","value":"A"},{"text":"Max.Planck","value":"B"},{"text":"Maxwell","value":"C"},{"text":"Bohr","value":"D"},{"text":"Rutherford","value":"E"}],"correctAnswer":2},{"id":158811,"question":"Intensity of light determines the:","choices":[{"text":"Energy of each photon","value":"A"},{"text":"Number of photons","value":"B"},{"text":"Speed of photons","value":"C"},{"text":"Size of photons","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158809,"question":"Electromagnetic -radiation means:","choices":[{"text":"Photons","value":"A"},{"text":"protons","value":"B"},{"text":"Electrons","value":"C"},{"text":"Mesons","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158807,"question":"The way through which electromagnetic radiations or photons interact with matter depends upon their:","choices":[{"text":"Wavelength","value":"A"},{"text":"Frequency","value":"B"},{"text":"Energy","value":"C"},{"text":"Temperature","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":5}]