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Ats, , (wesion Paper conain, (Puri- A& Par1 B), , SINo, , 0, , 20, , printed puges, , u, , UDU1, , 054 (E), , in OMR, Ru-jd, , Set No. of Question Paper, , (MAY, 2021), SCIENCE STREAM, , circe, , against which is to, , h, , darken in OMR sheet., , (CLASS, XI), (New Course), Part, , «llzui, , 07, , Time: 1 Hour/Marks: 50, Part-B Time : 2 Hours/ Marks: 50, A:, , (Part A), IMaximum Marks: 50, , Time: 1 Hour, , Instructons, ), There are 50 objective type (M.C.Q.) questions in Part A, , and all questions, , are compulsory., , 3)Read, , in, , mark., serially numbered from 1 to S0 and each carries 1, in the, each question carefully, select proper alternative and answer, , questions, , are, , s., , 2)The, , er, , O.M.R. sheet., , 6), , Set No. of Question Paper printed on the upper-most right side of the Question, , ap, , 5), , of each, The OMR sheet is given for answering the questions. The answer, 0. Darken thhe, question is represented by (A) 0, (B) 0, (C) O, (D), circleofthe correct answer with ball-pen., Booklet, work is to be done in the space provided for purpose in the Test, , Rough, , nP, , 4), , io, , only., , V, is, , Paper is to be written in the column provided in the OMR sheet., 7), , Students may use a simple Calculator and log-table, if necessary., , 8), , Notations used in this question paper have proper meaning., , ), , Parallel currents, , (A), , attract, attract, , (B), , repcl, atract, , and antiparallelcurrents, , Rough Work, , (C) attract. repel, (D) repel, repel, For More Papers Visit www.VisionPapers.in !!!, , NFG(07) (New), , G-512 (P.T.O.)
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2), , Cc, , the, , horizontal, , place,, the, is 0.26G and u, field, magnetic, Then the, is 0.52G., , of a, , meridian, , certain, , of the earth's, this location, dgnetic field ofthe earth at, Omponent, , dip angle is, , (A), , 60°, , (B) 45, , (C) 30, , According to Gauss's law for magnetism, the net magnetic flux|, , er, s., , 3), , in, , (D) 90°, , Equal to e,, , (B), , Infinite, , (C), , Zero, , V, , is, , io, , nP, , (A), , ap, , through any closed surfaceis, , (D) Equal to H, , 4), , The, , materials,, , which, , are, , used to make, , retentivity and, , permanent magnets, , coercivity., , (A) high, very low, (B) low, very low, (C) low, high, , (D) high, high, For More Papers Visit www.VisionPapers.in !!!
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S), , Unit of Induced emf is, (A), , Tesla, , (B), , Volt/Second, , (C), , Weber Second, , (D) Henry, , 6), , Onc conducting wire of length 50cm is mov ing perpendicular, to uniform magnetic ficld of 0.2 T, with constant velocity of, , (B), , 01, , C), , 0.01, , (D), , 10, , a, , wire, , is, , er, , 1.0, , ends of, , energy into, , AC Generator converts, , Mechanical, Electrical, , V, , (A), , is, i, , energy, , on, , ), , P, , ap, , (A), , two, , s., in, , emf induced betwecn, , 10ms, , (B), , Light, Mechanical, , (C), , Electrical, Mechanical, , (D) Electrical, Light, , 8), , Alight bulb is rated at 100W for a 220V supply. The resistance, of the bulb is, , Ohm, , (A) 484, (B), , 440, , (C), , 220, For More Papers Visit www.VisionPapers.in !!!, , (D), , 2200
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Formula of Q-factor (Ouality factor) is 9, , (A), , R, , (B), , R, , C), , o,R, , o,L, , s., in, , 9), , nP, ap, , er, , (D), , 10) For Ideal stepdown transformer,, V, <V, and, , I,, , <, , I, , io, , (A), , V, , is, , (B) V,> V, and I, > 1,, (C) , V , and 1, < 1,, (D), , V, <V, and 1, > I,, , 11), , waves are, , sometimes referred, , to as, , heat waves., , (A) Gamma, (B), , Ulraviolet, , (C), , Infrared, For More Papers Visit www.VisionPapers.in !!!, , D), , Radio
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12), , The, amplitude of the, is S10, nl. then, , magnetie field of olectromagnetie, , amplitude, , of the, , Vm, (A), , 153, , (B), , 153, , electrie tield of this, , wave, , wave, , is, , 10, , (C) 17 10, (D), , 170, , (B) Half, , ap, P, , Four times, , io, n, , (A), , er, , s., in, , 13) Lower half of the concave mimor's, reflecting surtace is covered, with an opaque, (non-rellective) material The, image ot an object placed in front of the intensity of the, mirror hecomes, , V, , is, , (C) One fourth, (D) Double, , 14) The refractive index of the material, of the core in, fibre i, , (A), , that of the cladding., , equal to, , (B) halfto, (C), , less than, , (D) higher than, For More Papers Visit www.VisionPapers.in !!!, , an, , optical
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the focal, , length of converging, , this lens is, , dioptre., , If, , hen power, lens is 0.25m, , Or, , (A) +2, , (B)4, (C), , +4, , (D)-2, , 16), , How much, from the, , rotate once about its axis., The earth takes 24 h to, 2° when viewed, time does the sun take to shift by, , 8 min, , (C), , 4 min, , (D), , Tmin, , er, , (B), , ap, , 2 min, , io, , nP, , (A), , s., in, , earth?, , 17) In Young's double slit experiment, as the width ofthe source, (A), , V, , is, , slit is increased,, , Interference fringe pattern gets less and less sharp, , (B) Interference fringe pattern gets more and, (C) There is no effect on interference, , more, , sharp, , fringe pattern, D) Intensity of interference fringe, pattern increases, 18) Ina two slit, , experiment, screen is, , light of wavelength 50Onm is placed one meter away. When, used the, 0.5mm. The, fringe separation is, distance, two, (A), , 2, , (B) 5, , C) 1, , between, , slit is, , mm., , For More Papers Visit www.VisionPapers.in !!!
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19) If the phase difference between two, , waves is, , 6m, , radian,, , then, , 20) Intensity of aresultant wave, obtained by superposition of, waves is, amplitude of resultant wave., , two, , coTesponding path difference is, (A) 6A, , (B) A, (C) 2, (D) 3, , A) directly proportional to cube of, , directly proportional to, (C) directly proportional to square of, , rs, , .in, , (B), , nP, , ap, e, , (D) directly proportional to square root of, , io, , 21) Electron emission from metals like zinc, cadmium,, , light., , magnesium, , V, , is, , responded only to_, (A) Visible, , (B) Ultraviolet, C) Infrared, (D) Yellow, , 22) For a given frequency of incident radiation, stopping, potential, (A) does not depend on intensity, , inversely proportional to intensity, (C) is directly proportional to intensity, (B), , is, , (D) is inverscly proportional to square of intensity, For More Papers Visit www.VisionPapers.in !!!
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of, Irequeny, , 23) The slope of a, gruph of, incident radiation is, , verstus, , potential, , pping, , (A), (B) h, (C), , (D), , h, , (Where h, , charge of an, , cleciron), , Which ofthe following physical quantity is having same unit, , s., in, , 24), , Planck's constant and e, , =, , as Planck's constant?, , er, , Moment of Inertia, , ap, , (A), , (B) Angular momentum, , nP, , (C) Linear momentum, , V, , is, , io, , (D) Rotational kinetic energy, 25) De-Broglie wavelength of a bullet, of, at the, , speed of, , Ikm/sis, , mass 0.040kg travelling, m., , (A) 1.7x 10-3, (B), , 4.04 x 104, , (C), , 1.1x 10-32, , (D) 3x 10-2, , 26) The energy, , equivalent to, , (A) 9x 10, , l, , gram, , (g) substance is, , (B) 9101, (C) 9, , 10, , (D) 9, , 10*, , For More Papers Visit www.VisionPapers.in !!!, , J,
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27) Total energy, are E and K, , A), , and, , kinelic energy of, respectively then., , an, , electron in, , hydrogen a, , K 2E, , (B) K-E, (C) K=, (D), , 28), , 2, , K = E, , Which of the following series is not seen in Infra-red region, , for hydrogen spectrum, , (C), , Bracket, , (D), , Paschen, , er, , Pfund, , ap, , (B), , s., in, , (A) Lyman, , P, , energy of, hydrogen atom is, , io, n, , lonisation, , electron in third excited state, , eV, , 13.6, , V, , (A), (B), , an, , is, , 29), , 1.51, , (C), , 0.85, , (D), , 3.4, , For More Papers Visit www.VisionPapers.in !!!, , 30), , Hg, , and, , Au are examples, , (A), , Isotopes, , (B), , Isomers, , (C), , Isobars, , (D), , Isotones, , AEC roT) (New, , of, , for
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31) I mCi, (A), , Bq, , 37, , (B), , 4), , 10*, , 10, , (C), , 3.7x 1010, , (D), , 3.7x 10', , Halflife, , of certain, , If its initial, radioactive clement is 12 years., , s., , in, , activity is I, what is it's activity after 48 years?, , io, nP, , ap, , er, , A), , V, is, , (B), , (D), For More Papers Visit www.VisionPapers.in !!!, , 33) Ina curve of, , binding energy per nucleon versus mass number, (A), the maximum value, E, is, the value, of corresponding atomic ofimass, , 8.7SMeV/nucleon, , number is, , (A) 56, , (B) 235, (C) 238, (D), , 171
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34) In intrinsie, semi conducte, uctor, the number density of free clectron, Sn, and the number, , (A) n, , density of holes, , ,, , is, , n,, , (B) n.-2n,, , (C) n.n,, (D) n.<En,, , 35), , In an unbiased p-n junction, holes diffuse from the p-region to, , in, , n-region because,, Free electrons in the n-region attract them, , (6), , They move across the junction by the potential difference, , (C), , Hole concentration in, , p-region is more as compared to, , io, n, , P, , ap, , er, , s., , (A), , is, , n-region, , V, , (D) All the above, , 36) Electric, , force between electron and proton, , distance ofI mm is. F=_, , separated by, , N4E,, , For More Papers Visit www.VisionPapers.in !!!, , (A), , -10 Ke, , (B), , -10, , (C), , -10 Ke?, , (D), , -10 K e, , Ke?, , a
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37) Dimension of electric-Flux, , IS, , ., , (A) M'LT'A', (B), , M'L'TA, , (C) M'L'T'A', , (D) M'L'T'A, , protons, , contains n,, body, of charge on the body is ., , and n,, , electrons, , the total, , amount, , (A) (,-n,)e, , in, , (B) (n-n)e, , s., , (C) (n, +n.)e, , From which, , nP, ap, , 39), , er, , (D) (n, +n,)e, , below have a, in the absence of an, , of the following molecules given, even, , V, , (A) HO, , is, , io, , permanent electric dipole moment,, electric field?, , (B) CH, (C) Co,, (D) 0, For More Papers Visit www.VisionPapers.in !!!, , 40) For any charge configuration, equipotential surface, point is, to the electric, field at, , (A) Ina direction making an, (B), , that point, , angle of, , 450, , Paralel, , (C) Normal, (D), , Inadirection making an, , through a, , angle, , of 60°
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article having, dilference AV, it charge9 '9, , 41) A, , (A), , Is accelerated, , by, , a, , polential, , would gain energy, o, , q AV, , (B) 'av, (C) qAV, (D) qaVv, 42) Resultant force and resultant torquc acting on a electric dipole, kept in a uniform electric field are F and f then;, , (A) F0; f=0, (B) =0; 7*0, , rs, , .in, , (C)-0;f=0, , ap, e, , D) F#0; Y20, , area, , distance between two, , plates d=, , io, , nP, , 43) In aparallel plate capacitor,, , F., , 44), , Im* and the, , Imm, then capacitance, , of a, , is, , capacitor C=_, , ofeach plate A=, , 8.85 x10-13, , (B), , 8.85 x 10, , (C), , 8.85x 10%, , (D), , 8.85x 10-1s, , V, , (A), , ers.in !!!, .VisionPap, w, w, w, it, is, apers V, For More P, c u r r e n t (). passing through, law, Electric, Ohm's, that dimension of, According to, in such a way, increasing, is, then Resistance, the conductor, r e m a i n s constant,, conductor and, , temperature, , o fconductor(R)_, (A), , Remains constant, , (B), , Decreases, , ( C ) I n c r e a s c s, , then, decreases, , (D), , Initially, , after increases
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45), , divided into 10 equal, wire is 'R, it is, EliectUve, connected in parallel., , SIstance of conducting, All these parts are, Now, , resistance of the connection is, , (A), , 100 R, , (B), (C) 10R, , R, , (D), , 100, , 46) The device having power P and voltage 'v'. The connecting, , Re., , The, , power dissipated in the connecting, , wires, , P, ap, , er, , P, , s., in, , wires from the power station to the device has a finite resistance, , on, , (A), , V, , is, i, , (B) PR, C), , PR, , (D), For More Papers Visit www.VisionPapers.in !!!, , 47), , is used, to, , a ccll., , (A), , measure electromotive force (em) of, , Potentiometer, , (B) Voltmeter, (C), , Ammeter, , (D Wheatstone hridge, , NFG{0") (New), , Rou
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48) Dimension, of mobility (u)is, (A) M'LTA, (B) M'L'T'A, , (C) M'LT'A, (D) M'LTA, , 49) There is a coil of 100 turns having radius 10cm and carying a, current of IA. The magnitude of magnetic field at the centre, , of a coil is, , in, er, s., , 27 x 104, , ap, , (A), , T, , (D), , 50), , V, , is, , (C) Tx10, , io, , nP, , (B)10, , 47x 10, , made up|, 0.5m has a radius of Icm and is, A solenoid of length, of magnetic field inside the, magnitude, turns., of 500, Ifthex, current of, 10T then it carries a, 6.28, solenoid is, , A., (A), , 4, , (B), , 5, , (C), , 2, For More Papers Visit www.VisionPapers.in !!!, , (D), , 10
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054 (E), MAY, 2021), SIENCE, , STREAM, , CLASS XII), (New Course), , (Part B), , Maximum Marks, , : S50, , Time: 2 Hours, , Instructions, )Write in a clear legible handwriting, 2), , are three sections in, nere, questions are there., , Part, , eparale instruction is given, , accordingldy., , 5), 6), , at, , -, , B of, , in each, , right side represent, , numbers, he, Start new section on, , the, , and, question paper, , section., , total 1 to 27, , Read it carefully and, , answer, , the marks of the question., , new page., , Maintain sequence., , er, , SECTION-A, , s., , in, , Students may use a simple Calculator and log-table, if necessary., 12 (2, , marks each), , ap, , Answer any eight questions from the folowing question No. 1 to, , Obtain the, , equation, , of energy stored in capacitor,, , 21, , 2, , io, , 2), , nP, , W n t e any four properties of electric field lines., , 3Write only statements of Kirchhoff's Junction rule and loop rule., Define, , (21, , V, is, , 4), , magnetisation., , 5), , Write its formula. Also write its unit and dimension., Write Lenz's law. Explain in brief that it is a, specific statement of law of, conservation of energy., , 6), , By Drawing LC circuit diagram, obtain the, differential, , oscillations., 7), 8), , Write four, , characteristics of Electromagnetic, , Obtain the equation of effective focal, tn contact., , 9), , 10, , length, , equation, , photoelectric cut-oft voltage, , maximum kinetic energy, NFG07) (New), , ot, , |2, , 2, , for LC, , 2, waves., , for, , [21, , combination of thin lenses, , Explain Huygens principle for plane wavefront., , The, , [16], 2, , certain experiment is, 1.5V. What is the, photrelectrons emitted?, , 121, 121, , in a, , For More Papers Visit www.VisionPapers.in !!!, , 16, , 21
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GS12, , 11), 12), , Write, , two, , Suppuse, , postulates of Bolr's thhetTy, , a, , 21, , Si erystal, pure y, a has 55 xx 10, l0" atoms, atoms m I s doped by Pp", entavulent As. Calculate the number ofer tons ad holes, , lD, Given, that, n,=1.5 10 n, , elecu, , x, , SECTIONB, , Answer any six, 13), , 2, , questions from the following question No. 13 to 21.(3 arks each) |8, Two charges 3 10 C and-2 x10*C located 15cm apart., on the, A w int, x, , are, , line, , joining the, , two, , charges, , potential at infinity to be zero., Drift, , zero?, , Take, , u, , 13, , velocity of an electron passing through conductor is given by equatuon., , in, , e., , By accepting this equation obtain the equation of conductivity., t, , V, , 3, , ap, er, , ne, m, , 13, , A,, , =, , R,, , =, , A, , N,, , 102,, , =, , 10, , x, , 142, N,, 1.8, , =, , 30, m, B,, 42, , 10 m, B,, , x, , =, , 0.25T, , =, , 0.50T, , are idenical, , is, , =, , 3.6, , =, , nP, , The moving coil meters, M, and M, have the following partuculars, , io, , 15), , potential, , s., , 14), , is the electric, , (The spring constants, , for the, , two meters), , V, , Determine the ratio of, Current sensitivity and, Voltage sensitivity of M, and M,, b), , 14, 17), , Show that in the free, , of an LC circuit, the, , inductor is, in the capacitor and the, , constant, , sumn, , of energies stored, , 13, , in time., , lens is placed in the path of the, at a pointP. Now, converges, A beam light, beam converge if the, what point does the, At, P., from, 12cm, convergent beam, , of, , lens, , a), , IS, , In, , 13], , 20cm and, lens of focal length, of focal length 16cm?, c o n c a v e lens, , a convex, a, , 18), , oscillations, , a, , on a, , double-slit experiment, sereen, , Will be the, , immersed, , placed, , angular, in, , the angular, , Im away., width of, , width of, , a, , fringe, , be 0.2, 600nm. What, , is found, , used, , is, , of light, The wavelength, if the entire experiment, the, , to, , apparatus is, , fringe, , refractive index, water? Take, , of water to be, , For More Papers Visit www.VisionPapers.in !!!, , 131, P.T.O.)
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G-5512, ournd exper1mentally that, nvdrogen atom into a proton and, , s, , eV, , 13 6, an, , energ, , is, , required, , to, , separate, , clectron Compute the orbital radus, , a, , and, , 3, , the velocity of the clectron in a hvdrogen atom, 20), , How long can an electric lamp of 100W be kept glow ing by fusion of 2kg of, deuterium" Take the fusion, , H, , 21), , reaction as, , 13, , He+ n 3.27 MeV, , Explain llalf wave rectifier with necessar c1rcuit diagram. Draw the graphs, of, , Input, , Output voltage, , and, , 3, , versus timne., , Answer any four, , questions from, , the, , 22) For Electric, , (Each, , |16, , dipole., , Al any point on the axis, , nP, ap, , a), , No. 22 to 27., , following question, , er, , question carries 4 marks), , s., in, , SECTION-C, , b), Al any point on the, cquatorial plane, obtain the equations of an clectric field., , 141, , 24), , at, , the centre of the, , Discuss AC, , 25) In, , case, , ofa, , 141, , voltage applied to a capacitor in details. Also obtain, , of instantaneous power, , supplied, , at, , equation of magnetic, , loop., , V, is, , field, , io, , 23) Oblain the equation of magnetic field on the axis of a circular current, loop, a distance'r from the centre of the, loop. Also, write the, , to, , the, , capacitor., , an, , equation, , 14, , triangular glass prism. obtain ð =i+e-A. Mention the condition, , of minimum deviation, the material of, , angle, , and obtain the, , prism., , cquation, , of, , refractive index, , of, , 14, , 26) For diffraction by a single slit obtain the conditions of, maxima and, minima, in termis of, path difference, , 27) Forradioactive decay, obtain, exponeniial, undecayed nuclei versus time., , law. Draw the, , graph of number of, , For More Papers Visit www.VisionPapers.in !!!, , 14
