[{"id":158901,"question":"X-rays can penetrate in a solid matte through a distance of several:","choices":[{"text":"Kilo metres","value":"A"},{"text":"Metres","value":"B"},{"text":"Centimeters","value":"C"},{"text":"A few angstroms","value":"D"},{"text":"One micrometer","value":"E"}],"correctAnswer":3},{"id":158900,"question":"In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:","choices":[{"text":"Short wavelength","value":"A"},{"text":"Large wavelength","value":"B"},{"text":"Very large wavelenth","value":"C"},{"text":"Low frequency","value":"D"},{"text":"Both (B) and (C)","value":"E"}],"correctAnswer":1},{"id":158899,"question":"Braking radiation causes:","choices":[{"text":"Continuous spectrum","value":"A"},{"text":"Line Spectrum","value":"B"},{"text":"Band spectrum","value":"C"},{"text":"Discrete specturm","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":1},{"id":158898,"question":"The holes created in the L and M shells are occupied by transitions of:","choices":[{"text":"Electrons from lower states","value":"A"},{"text":"Electrons from higher state","value":"B"},{"text":"Positrons from higher states","value":"C"},{"text":"Electrons from K shell","value":"D"},{"text":"Both (A) and (B)","value":"E"}],"correctAnswer":2},{"id":158897,"question":"The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:","choices":[{"text":"Ultra red region","value":"A"},{"text":"Visible region","value":"B"},{"text":"Ultraviolet region","value":"C"},{"text":"Any of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158896,"question":"Energy required by an electron revolving in certain orbit to jump to an excited state is called:","choices":[{"text":"Ionization energy","value":"A"},{"text":"Ionization potential","value":"B"},{"text":"Excitation energy","value":"C"},{"text":"Excitation potential","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":158895,"question":"An electron of the hydrogen atom in the second orbit is called its:","choices":[{"text":"Ground state","value":"A"},{"text":"Excited state","value":"B"},{"text":"Ionized state","value":"C"},{"text":"Any of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158894,"question":"The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:","choices":[{"text":"<div>one</div>","value":"A"},{"text":"two","value":"B"},{"text":"three","value":"C"},{"text":"four","value":"D"},{"text":"five","value":"E"}],"correctAnswer":4},{"id":158893,"question":"Lyman series in the spectrum of hydrogen exists in the :","choices":[{"text":"Infra-red region","value":"A"},{"text":"Visible region","value":"B"},{"text":"Ultraviolet region","value":"C"},{"text":"Both(A) and (B)","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":158892,"question":"Tick the series which lie/s in. the infra-red region.","choices":[{"text":"Pfund series","value":"A"},{"text":"Brackett series","value":"B"},{"text":"Paschen series","value":"C"},{"text":"All of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":158891,"question":"Tick the series which lies in the visible region:","choices":[{"text":"Lyman series","value":"A"},{"text":"Balmer series","value":"B"},{"text":"Paschen series","value":"C"},{"text":"Brackett series","value":"D"},{"text":"P fund series","value":"E"}],"correctAnswer":2},{"id":158890,"question":"Spectrum represents the number of component colours present in certain light in terms of:","choices":[{"text":"Wavelength","value":"A"},{"text":"Frequency","value":"B"},{"text":"Energy","value":"C"},{"text":"Both (A) and (B)","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":5},{"id":158889,"question":"The process of formation of spectrum is called:","choices":[{"text":"Interference","value":"A"},{"text":"Spectroscopy","value":"B"},{"text":"Dispersion","value":"C"},{"text":"Reflection","value":"D"},{"text":"Botha (A) and (D)","value":"E"}],"correctAnswer":2},{"id":158888,"question":"The results of spectra obtained by Balmer were expressed in 1896 by:","choices":[{"text":"<div>Bohr</div>","value":"A"},{"text":"Rydberg","value":"B"},{"text":"Planck","value":"C"},{"text":"Rutherford","value":"D"},{"text":"Coulomb","value":"E"}],"correctAnswer":2},{"id":158887,"question":"The natural arrangement of colours in the spectrum of white light spectrum is","choices":[{"text":"VIBGYOR","value":"A"},{"text":"ROYBGIV","value":"B"},{"text":"ROYBIGV","value":"C"},{"text":"BIGROYV","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158886,"question":"Balmer series lies in that region of electromagnetic wave spectrum which is called:","choices":[{"text":"Visible region","value":"A"},{"text":"Invisible region","value":"B"},{"text":"Infra-red region","value":"C"},{"text":"ultraviolet region","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158885,"question":"Balmer series was identified in:","choices":[{"text":"1685","value":"A"},{"text":"1785","value":"B"},{"text":"1885","value":"C"},{"text":"1985","value":"D"},{"text":"1585","value":"E"}],"correctAnswer":3},{"id":158884,"question":"The first series which was identified in the spectrum of hydrogen is called:","choices":[{"text":"Lyman series","value":"A"},{"text":"Balmer series","value":"B"},{"text":"Paschen series","value":"C"},{"text":"Brackett series","value":"D"},{"text":"Pfund series","value":"E"}],"correctAnswer":2},{"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}]