[{"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},{"id":158805,"question":"If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:","choices":[{"text":"Newton","value":"A"},{"text":"Joule","value":"B"},{"text":"Joule-Sec","value":"C"},{"text":"Joule-s<sup>-1</sup>","value":"D"},{"text":"Watt","value":"E"}],"correctAnswer":2},{"id":158804,"question":"Max Planck received the Nobel Prize for his discovery of energy quants in:","choices":[{"text":"1718 AD","value":"A"},{"text":"1918 AH","value":"B"},{"text":"1818 AD","value":"C"},{"text":"1918 AD","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158803,"question":"The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:","choices":[{"text":"Wien's constant","value":"A"},{"text":"Stefen's constnat","value":"B"},{"text":"Planck's constant","value":"C"},{"text":"Boltzmann's constant","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":158802,"question":"Wien's constant is measured in:","choices":[{"text":"Metre per kelviin","value":"A"},{"text":"Metre kelvin","value":"B"},{"text":"Kelvin per meter","value":"C"},{"text":"Joules","value":"D"},{"text":"Dynes","value":"E"}],"correctAnswer":2},{"id":158801,"question":"The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:","choices":[{"text":"Lummer","value":"A"},{"text":"Planck","value":"B"},{"text":"Pringsheim","value":"C"},{"text":"Both (A ) and (B)","value":"D"},{"text":"Both (A) and (C)","value":"E"}],"correctAnswer":5},{"id":158800,"question":"When platinum wire is heated, then at the temperature of 500 <sup>o</sup>C, it becomes:","choices":[{"text":"Yellow","value":"A"},{"text":"Orange red","value":"B"},{"text":"Dull red","value":"C"},{"text":"White","value":"D"},{"text":"Cherry red","value":"E"}],"correctAnswer":3},{"id":158799,"question":"The nature of radiations emitted by a hot body depends upon its:","choices":[{"text":"Metarial","value":"A"},{"text":"Temperature","value":"B"},{"text":"colour","value":"C"},{"text":"Volume","value":"D"},{"text":"Length","value":"E"}],"correctAnswer":2},{"id":158798,"question":"When the atomic particle are moving with velocities approaching that of light:","choices":[{"text":"Newton's laws become valid","value":"A"},{"text":"Relativistic effects become prominent","value":"B"},{"text":"Botha(A) and (B) are valid","value":"C"},{"text":"Neither (A)nor (B)","value":"D"},{"text":"There mass becomes zero.","value":"E"}],"correctAnswer":2},{"id":158795,"question":"As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:","choices":[{"text":"Smaller","value":"A"},{"text":"Lerger","value":"B"},{"text":"Same","value":"C"},{"text":"Much larger","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158793,"question":"the dilation of time applies to the timing processes which are:","choices":[{"text":"Physical","value":"A"},{"text":"Chemical","value":"B"},{"text":"Biological","value":"C"},{"text":"All of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158791,"question":"Due to relative motion of observer and the frame of reference of events, time always:","choices":[{"text":"Dilates itself","value":"A"},{"text":"Contracts itself","value":"B"},{"text":"Stretches itself","value":"C"},{"text":"Both (A) and (C)","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158789,"question":"Practically the quantity v/c is always:","choices":[{"text":"less than one","value":"A"},{"text":"Equal to one","value":"B"},{"text":"Greater then one","value":"C"},{"text":"all of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158787,"question":"the symbol to be used in relativity problems denotes:","choices":[{"text":"Dilated time","value":"A"},{"text":"Proper time","value":"B"},{"text":"Life time","value":"C"},{"text":"Half time","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158785,"question":"There is no way to detect:","choices":[{"text":"Absolute uniform motion","value":"A"},{"text":"Accelerated motion","value":"B"},{"text":"State rest","value":"C"},{"text":"State of motion","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158783,"question":"The special theory of relativity is based on:","choices":[{"text":"Four postulates","value":"A"},{"text":"Three postulates","value":"B"},{"text":"Two postulates","value":"C"},{"text":"One postulate","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3}]