[{"id":254145,"question":"<div>A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms<sup>1</sup> The KE of other mass is</div>","choices":[{"text":"324 J","value":"A"},{"text":"256 J","value":"B"},{"text":"245 J","value":"C"},{"text":"524 J","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254143,"question":"The power needed to lift amass of 5000g to height of 1min 2 second is","choices":[{"text":"2.45 watt","value":"A"},{"text":"24.5 watt","value":"B"},{"text":"245 watt","value":"C"},{"text":"2.45 k watt","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254142,"question":"3 joules of work is done in 3 seconds, then power is:","choices":[{"text":"6 watt","value":"A"},{"text":"3 watt","value":"B"},{"text":"18 watt","value":"C"},{"text":"1 watt","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":254141,"question":"<div>A stone is thrown up from the surface of earth when it reaches at maximum height. its total energy is equal to</div>","choices":[{"text":"mgh","value":"A"},{"text":"1/2 𝑚𝑣<sup>2</sup>","value":"B"},{"text":"zero","value":"C"},{"text":"2mgh","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":254140,"question":"<div>You lift a suit case from the floor and keep it on a table. The work done by you on the suitcase does not depend on</div>","choices":[{"text":"the path taken by the suitcase","value":"A"},{"text":"weight of the suitcase","value":"B"},{"text":"initial and final position","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":254139,"question":"<div>Car X is traveling at half the speed of car Y. Car X has twice mass of car Y.</div><div>Which statement is correct?</div>","choices":[{"text":"Car X has half the kinetic energy of car Y","value":"A"},{"text":"Car X has one quarter of the kinetic energy of car Y","value":"B"},{"text":"Car X has twice the kinetic energy of car Y","value":"C"},{"text":"The tow cars have the same kinetic energy","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":254046,"question":"Light of frequency 2 times the threshold frequency is incident on the metalsurface. Ifthe frequency is by quartered and intensity is doubled, the photoelectric becomes","choices":[{"text":"Quadrupled","value":"A"},{"text":"Zero","value":"B"},{"text":"Doubled","value":"C"},{"text":"Halved","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254045,"question":"Beta particles have less ionizing power than that of alpha particles\r\nbecause:","choices":[{"text":"Their smaller energy","value":"A"},{"text":"Their smaller mass","value":"B"},{"text":"Their smaller density","value":"C"},{"text":"Their smaller charge","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":254043,"question":"In electron microscope, we use high speed electrons because them","choices":[{"text":"Penetration power is higher","value":"A"},{"text":"Wavelength is smaller","value":"B"},{"text":"Frequency is smaller","value":"C"},{"text":"K.E is smaller","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254042,"question":"In photoelectric effect experiment, stopping potential depend upon","choices":[{"text":"Intensity of light","value":"A"},{"text":"Frequency of light","value":"B"},{"text":"Photoelectric current","value":"C"},{"text":"Both A and B","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254041,"question":"de-Broglie wavelength associated with an electron moving at a speed of 1x106 ms-1 is","choices":[{"text":"4x10-10 ms-1","value":"A"},{"text":"5x10-10 m","value":"B"},{"text":"6x10-10 m","value":"C"},{"text":"7x10-10 m","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":254039,"question":"Beta particles have penetration of about:","choices":[{"text":"100 times more than that of the gamma particles","value":"A"},{"text":"100 times less than that of an alpha ray","value":"B"},{"text":"100 times more than that of an alpha ray","value":"C"},{"text":"10 times more than that of an alpha particle","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254038,"question":"If an electron is accelerated such that its K.E is 4 times of its rest mass energythen thetotal relativistic energy of electrons is about","choices":[{"text":"5 × 10–12 J","value":"A"},{"text":"4 × 10–13 J","value":"B"},{"text":"3 × 10–13 J","value":"C"},{"text":"6 × 10–12 J","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254036,"question":"Temperature of black body radiating at 270c is increased to 327oc, then emittedenergywill increase by","choices":[{"text":"2 times","value":"A"},{"text":"12 times","value":"B"},{"text":"16 times","value":"C"},{"text":"4 times","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254035,"question":"Which row is correct for fission and for fusion?","choices":[{"text":"Produces larger nuclei","value":"A"},{"text":"Produces larger nuclei","value":"B"},{"text":"Produces smaller\r\nnuclei","value":"C"},{"text":"Produces smaller\r\nnuclei","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254034,"question":"A photo cell receives light from a source at 50 cm away and produces 40mAcurrent inthe circuit. When the same source at is at distance 1 m from photo cell,current in the circuit will be","choices":[{"text":"20 mA","value":"A"},{"text":"80mA","value":"B"},{"text":"60 mA","value":"C"},{"text":"10 mA","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":254032,"question":"Work function of all metals varies from 2 eV to 4eV. It is 4.2 eV for Aluminum and2eV for Sodium. If these two metals are illuminated by same light, the thresholdfrequency ofAluminum is","choices":[{"text":"Less than Sodium","value":"A"},{"text":"Equal to that of Sodium","value":"B"},{"text":"Grater than Sodium","value":"C"},{"text":"Can’t be decided","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254031,"question":"The most penetrating radiations out of the following is that of","choices":[{"text":"𝛾-rays","value":"A"},{"text":"β-rays","value":"B"},{"text":"α-particles","value":"C"},{"text":"X-rays","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":254029,"question":"Choose incorrect about properties of photon","choices":[{"text":"Rest mass of photon is zero","value":"A"},{"text":"A photon is never at rest","value":"B"},{"text":"Photon is not deflected by electric field not by magnetic field","value":"C"},{"text":"The velocity of photon is different in different media","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254028,"question":"During a negative β-decay","choices":[{"text":"An atomic electron is ejected","value":"A"},{"text":"A neutron in the nucleus decays emitting an electron","value":"B"},{"text":"An electron which already present within the nucleus is ejected","value":"C"},{"text":"A part of binding energy of nuclei is converted into electron","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254026,"question":"During a negative β-decayv","choices":[{"text":"An atomic electron is ejected","value":"A"},{"text":"A neutron in the nucleus decays emitting an electron","value":"B"},{"text":"An electron which already present within the nucleus is ejected","value":"C"},{"text":"A part of binding energy of nuclei is converted into electron","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254023,"question":"In photo electric cell, the photo electric current","choices":[{"text":"Decreases with increase in frequency of light","value":"A"},{"text":"Depends on intensity and frequency of light","value":"B"},{"text":"Does not depend upon the frequency of light and but depends upon intensity of light","value":"C"},{"text":"Increases with increase in frequency of light","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254021,"question":"When a radioactive nucleus remits a beta particle, the proton neutron ratio:","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Remain same","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254020,"question":"Intensity of light from a point source at the edge of unit sphere will be:","choices":[{"text":"𝑃","value":"A"},{"text":"𝑃","value":"B"},{"text":"P(4π)","value":"C"},{"text":"4𝜋","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254019,"question":"When the radioactive nucleus emits a beta particle, the proton neutron ration:","choices":[{"text":"increases by one","value":"A"},{"text":"Remains same","value":"B"},{"text":"Decreases by one","value":"C"},{"text":"Decreases by four","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254017,"question":"The binding energy per nucleon is:","choices":[{"text":"Greater for heavy nuclei","value":"A"},{"text":"Least for heavy nuclei","value":"B"},{"text":"Greatest for light nuclei","value":"C"},{"text":"Greatest for medium nuclei","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":254015,"question":"The rate of decay radioactive substance:","choices":[{"text":"Is constant","value":"A"},{"text":"Decrease exponentially with time","value":"B"},{"text":"Varies inversely with time","value":"C"},{"text":"Decrease linearly with time","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254014,"question":"Three quarks make up a:","choices":[{"text":"Leptons","value":"A"},{"text":"Mesons","value":"B"},{"text":"Baryons","value":"C"},{"text":"Quark","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254013,"question":"<div>Monochromatic light of wavelength 300 nm is incident normally on a surface of area 4 cm2.</div><div>If the intensity of light is 150 mW/m2; the rate at which photon strike the surface:</div>","choices":[{"text":"2.53 × 1019","value":"A"},{"text":"7.5 × 1019","value":"B"},{"text":"9.1 × 1013","value":"C"},{"text":"2.53 × 1013","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254012,"question":"How many photons per second does a one-watt bulb emit if its efficiency is 10% and the wavelength of light is 500 nm:","choices":[{"text":"2.53 × 1017","value":"A"},{"text":"2.53 × 1019","value":"B"},{"text":"7.5 × 1019","value":"C"},{"text":"7.5 × 1017","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":254011,"question":"The particles equal in mass or greater than mass of protons are called:","choices":[{"text":"Leptons","value":"A"},{"text":"Mesons","value":"B"},{"text":"Baryons","value":"C"},{"text":"Quarks","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254010,"question":"What will be the number of photons emitted per second by 25 W source of monochromatic light of wavelength 600 nm:","choices":[{"text":"7.5 × 1017","value":"A"},{"text":"7.5 × 1019","value":"B"},{"text":"5.5 × 1019","value":"C"},{"text":"5.5 × 1017","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254009,"question":"In nuclear fission reaction, when the products are 140X and 94Sr, the number of neutrons\r\nemitted is","choices":[{"text":"1","value":"A"},{"text":"2","value":"B"},{"text":"5","value":"C"},{"text":"9","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254008,"question":"Because of large mass when 𝑎 −paricle enters the atom or molecule it:","choices":[{"text":"Moves in zigzag path","value":"A"},{"text":"Moves along straight line","value":"B"},{"text":"Moves along circular path","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":254007,"question":"What is the momentum of a photon of light of wavelength 500 nm in kgm/s:","choices":[{"text":"1.32 × 10−21","value":"A"},{"text":"1.32 × 10−23","value":"B"},{"text":"1.32 × 10−25","value":"C"},{"text":"1.32 × 10−27","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":254006,"question":"Which one is the correct express of de-Broglie equation for the length of atoms of mass m at temp? T(k=Boltzmann’s constant):","choices":[{"text":"<br>","value":"A"},{"text":"","img":"254006_638248551860613286-RA2.png","value":"B"},{"text":"","img":"254006_638248551860613286-RA3.png","value":"C"},{"text":"","img":"254006_638248551860613286-RA4.png","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254005,"question":"The fusion of hydrogen into helium is more likely to take place:","choices":[{"text":"At high temperature and high pressure","value":"A"},{"text":"At high temperature and low pressure","value":"B"},{"text":"At low temperature and low pressure","value":"C"},{"text":" At low temperature and high pressure\r\n","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":254004,"question":"The more readily fissionable isotope of uranium has an atomic mass of:","choices":[{"text":"220","value":"A"},{"text":"230","value":"B"},{"text":"235","value":"C"},{"text":"240","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254003,"question":"The number of electrons in a nucleus X of atomic number Z and mass number A is:","choices":[{"text":"A","value":"A"},{"text":"W","value":"B"},{"text":"Z","value":"C"},{"text":"Y","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":254002,"question":"The Balmer series is found in the spectrum of:","choices":[{"text":"Hydrogen","value":"A"},{"text":"Nitrogen","value":"B"},{"text":"Oxygen","value":"C"},{"text":"All","value":"D"},{"value":"E"}],"correctAnswer":1}]