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PHYSICS (054) (E) Sot No. 2, , | PHYSICS_| BOARD Q. PAPER-1 (seu practice) | PS eM Rae, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , [ Time : & Hours AUGUST 2020 Total Marks : 100, + Part-A : Time 1 hour / Marks 50 + Part-B ; Time 2 hour / Marks : 50, PART-A, Time : 1 Hour] [Maximum marks : 50, , , , , , , , , , Instructions : (1) There are 50 objective type (M.C.Q.) questions in Part-A and all, questions are compulsory., , (2) The questions are serially numbered from 1 to 50 and cach carries, ~ 1 mark,, , (3) Read each question carefully, select proper alternative and answer, in the O.M.R. sheet., , (4) The OMR sheet is given for answering the questions. The answer, , of cach question is represented by (A) O, (B) O, (C) O, (D) O., Darken the circle @ of the correct answer with ball-pen., , (5) Rough work is to be done in the spare provided for this purpose in, the Test Booklet only., , (6) Set No. of Question Paper printed on the upper most right side of, , the question paper is to be written in the column provided in the, OMR sheet., , (7) Students may use a Simple Calculator and long-table, if necessary., 1, Obtain approximately the ratio of the nuclear radii of the gold isotope 4” Au and, the silver isotope mn Ag., , (A) 1.68 (B) 1.35 (C) 1.84 (D) 123, , 2. Carbon, silicon and germanium have four valence electrons each. These are, characterised by valence and conduction bands seprated by energy band gap, respectively (E)c, (Eg)sj and (E,)ce Which of the following statements is true?, , (A) (Eg)c > (Eg)si > (Eg)ce (B) (Ede < (Exce > (EQ)si, , (C) (Eg)si < (Eg)ae < (Ede (D) Egle = (Eg)si = Ee)ce, 3. When a forward bias applied to a p-n junction, it., , (A) raises the potential barrier, , (B) reduce the majority currier current to zero, , (C) lowers the potential barrier, , (D) none of the above, , 4. In fullwave rectification, what is the cotput frequency if the input frequency is, 50 Hz, , (A) 100 Hz ‘(B) 25 Hz (C) 50 Hz (D) 50/2 Hz, , For More Papers Visit www.VisionPapers.in !!!
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10., , ll., , (3., , , , Sifikowh dn the following figure, circuit act as gate, , , , (A) NOT (B) OR (C) AND (D) Nor, C is the number of positicve charge for cup having 180g Water., (A) 1.34 x 108 (1B) 0,963 x 107 (C) 1.34 x 107 (D) 0.963 x apy, is the dimensional formula for clectrion dipolemoment. i, (C) MONTIAL ——(D) MYLstpg,, , , , (A) M°L'MA! (B) M°L'T!A-!, A conducting sphere of radius 10cm has an ahsowe charge, If the, 20cm form the centre of the sphere is 1.5 x 10? N/C and points rag, , net charge on the sphere ?, (C) -6.68 nc (D) +668 tig, , Clectrj, ally inva,, , what is the, (A) -66.8 pe (B) +6.68 ne, An infinite line charge produces a field of 9 x 104 NC-!, , Cn! is the linear charge density., (A) 1 x 105 (B) 1 x 10-6 (C) 10 x 106 (D) 1 x J93, , The cnpacitance of a parallel-plate capacitor with vacuum is 5 HF . If a dieleop:, slad with J< = 1.5 is inserted between the plates, the capacitance wil] be equal, , to _, (A) 0.75 pF (B) 7.5 pF (C) 3.33 pF (D) 0.33 pF, , mm? is the area for a parallel plate capacitor having capacitance 8.85 uP, , at a distance of 2, , , , plates are kept at distance of 1 mm., , (A) 1 x 103 (B) 10 (C) 1, An electric dipole kept in unif0orm electric field at an angle “0” has minimum, , potential energy. The value of “0” is, (A) 90° (B) 45° (C) 0°, Which of the following physical quantities has a unit similar to the elec, dejasity?, , (Ax) Angualr momentum, , ('‘C) Work, The storage battery of a car emf 12V If the internal resistance of the bettery, is 0.4 Q What is the maximum current that be drawn form the battery ?, (A) 0.3A (B) 30.A (C) 3A (D) 0.03A, , The four arms of a wheatstone bridge have the resistances R, = 1002, Ry = 10%, Rs = 5002 and Ry. What will be the value of Ry if the wheatstone bridege ©, , blanced 7, (A) 5 K (B)22 (C) 2 Ka (D) 50 2, , For More Papers Visit www.VisionPapers.in !!!, , (D) 1 x 102, , (D) 180°, tric energy, , (B) Pressure, (D) Electric current density
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—_: — . 7, 16, Form the follwing which one is a colour code for a carbon resistance having, resistance (2200 Q) + 5%,, , (A) Borwn, Red, Red Gold (B) Red, Red, Red, No Colour, (C) Red, Red Red, Silver (D) Red, Red, Red, Gold, , 17. The resistance of the platinum wire of a platinum resistance thermometer at the, ice point is SQ and at steam point is 5.23Q. When the thermometer is inserted, , in a hot bath, the resistance of the platinum wire is 5.46. Calculate the temperature, of the bath., , (A) 345.65 °C (B) 200 °C (C) 200 K (D) 345.65 K, , 18. Three resistros 4, 8Q, and 10Q are combined in parallel. what is the total, resistance of the combination ?, , (A) 2.10 Q (B) 19/20 Q (C) 1.05 Q (D) 22, , 19. A solenoid of length 0.5 m has a radius of lcm and is made up of 500 turns., It carries a current of 6A. What is the magnitude of the magnetic field inside, the solenoid ?, , (A)24nx104T = (B)20nx104T (C) Zero (D) 242 x 104G, , 20. What is the freqency of an electron (mass 9 x 107!kg and charge 1.6 x 107!9C), moving at a speed of 3 x 107 m/s in a magnetic field of 4 x 10“T perpendicular, , to it?, (A) 11.32 MHz (B) 1.7 MHz (C) 17 MHz (D) 1.132 MHz, 21. From the following is the formula for Lorentz force., > > > 3 > > ~ (A) F=q B+ (Bxy) () F=-q[ 8 - (¥x3)|, > > ~~ 3 3 = > 4, (C) F=-q B ules) (D) P= q[ 8 + (vx), , 22. What is the magnitude of the equitorial magnetic field due to a bar magnet of, length 5.0 cm and having magnetic dipole moment 0.40 Am? at a distance of, 50 cm from its mid point?, , (A)08x107T (B)64x107T (C)16x107T (D)3.2x107T, , 23. A short bar magnet placed with its axis at 30° with a uniform external magnetic, field of 0.15 T experiences a torque of magnitude equal to 4.5 x 10% N.m, , , , “ is the magnitude of magnetic moment of the magnet., (A) 0.60 (B) 0.36 (A) 0.45 (D) 0.18, 24. Ferromagnetic materials are having retentivity and permeability., , (For electromagnetic core) For More Papers Visit www.VisionPapers.in !!!, (A) High, Low (B) Low, High (C) High, High (D) Low, Low, , 25, A jet plane is travelling towars west at a speed of 500 ms-'. What is the voltage, difference developed between the ends of the wing having a span of 25m, If the
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ae, , , , , , , , , , , , , , , , 4, Enth’s vertical magnetic field component at a location has a magnitude of}, 2.5 x 10“T and the dip angle is 30°., (A) 1.562 mV (B) 3.125 mV (C) 1.562 V (D) 3.125 v, , 26. T m? A“! is unit of ______ physical quantity., (A) Magnetic field (B) Magnetic flux, (C) Inductance (D) Magnetic dipole moment, , 27. A square of L meters lies in the xy plane in a region, where the magnetic fielg, is given by B = By (2i +3) + 4k) T, where Bg is constant. The magnitude of, flux passing through the square is Wb., (A) 4 Bol? (B) 3 BoL? (C) 2 Bol? (D) V29 BoL2, , 28. A light bulb and an open coil inductor are connected to an ac source through, a key as shown in figure. The switch is closed and after some time. an iron rod, is inserted in to the interior of the inductor. The glow of the light bulb we, , Gn) CSSCTS, ‘ @, (A) Unchanged (B) Decrease, (C) Increase (D) Increase and Decrease, , 29. A Peak voltage of an ac supply is 300V. V is the value of rms voltage., (A) 212 (B) 173 (C) 423 (D) 269, , 30. For LCR series circuit, L = 2.0 H, C = 32 wF and R = 10 Q, is the, Q value for this circuit. ’, (A) 395 (B) 279 (C) 40 (D) 25, , 31. A plane electromagnetic wave of frequency 25 MHz travel in free space along, the X-direction. At a particular point in space and time. E = 6.3 j Vm. Value, of B at this point will be, (A) 2.1 x 108 k T (B) 2.1 x 108 | T, (C) 2.1 x 108 k T (D) 2.1 x 108 j T, , 32. is used for Lasik eye surgency., (A) Ultra violet rays (B) Micro waves, (C) Infared rays (D) Radio waves, , 33. An object is placed at 10 cm in from of a concave mirror of radius curvature, , 15 cm. Then magnification of image is, , 1, (eS @) -3 (C)3 () :, , For More Papers Visit www.VisionPapers.in !!!
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40., , 41., , 42., , 43., , 44,, , 45., , ‘The Earth lakes 24th to rotate once about its axis. The sun will take _____—, time to shift by 1° when viewed from the carth, , (A) 240s (B) 24 5 (A) 48 (D) 60 s, , A magician during a show makes a glass lens with n = 1.47 disappear in a trough, of liquid. The refractive index of liquid is, , (A) 1.56 (B) 1.47 (C) 1.33 (D) 2.42, , For compound microscope fy = 1 cm, f, = 2 em and tube length (L) = 20cm., Then the total magnification is, , (A) 200 (B) 250 (C) 2.5 (D) 20, Dimensional formula for power of lens is ., (A) M°L'T? (B) Mar (Cc) M°L-'T® (D) M'L-!T!, , tar. What is the, , Assume that a light of wave length 6000A is coming from a s, ter of 254 cm?, , limit of resolution of a telescope whose objective has a diame, (A) 2.9 x 107 radian (B) 2.9 x 106 radian, (C) 2.9 x 10% radian (D) 2.9 x 10-7 radian, For what distance is ray optics a good approximation when the aperture is 3 mm, wide and the wavelength is 500 nm?, , (C) 18 cm (D) 1.8 cm, , (A) 18 m (B) 1.8m, sed light is incident on a plane glass surface. What should be the angle, , Unpolari, , of incidence so that the reflected and refracted rays are perpendicular to each other., [u = 1.54], , (A) 55° (B) 30° (C) 57° (D) 45°, , The refractive index of water is 4/3. What is the speed of light in water?, (B) 2.25 x 108 ms"!, , (A) 3 x 108 ms!, (D) 2 x 108 ms"!, , (©) 4 x 108 ms"!, From phenomenon of optics, one can say that light rays are transverse., , (A) Reflection (B) Diffraction (C) Interference (D) Polarisation, , Monochromatic light of frequency 6.0 x 108 MHz is produced by a laser. The, power emitted is 2 x 10 W. What is the energy of photon in the light beam., , (A) 3.98 x 10-19 J (B) 3.98 x 10-19 eV, , (C) 3.98 eV (D) 3.98 x 10-!9 kJ, , The photoelectric cut-off voltage in a certain experiment is 1.6 V. The maximum, kinetic energy of emitted photoelectron is, , (A) 1.6 k eV (B) 2.56 eV, , (C) 2.56 x 10-9 J (D) 1.6 x 10-9 J, , The de-Broglie wavelength of a ball of mass 120g moving with a speed of, 20ms! is ;, , (A) 2.76 x 104A (B) 2.76 x 1074m, , (C) 2.76 x 10-4m (D) 2.76 x 104A, , For More Papers Visit www.VisionPapers.in !!!
