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Transcript
Ques 1 : i)Two different parts of monochromatic light act as coherent sources. ii) Two different monochromatic sources act as coherent sources. iii) Two different part of same wave front act as coherent sources iv) Two images of same source act as coherent sources a) i) & ii b) ii) & iii) c) iii) & iv) d) ii) & iv) Ans 1: c) iii) Two different part of same wave front act as coherent sources iv) Two images of same source act as coherent sources Ques 2 : Pairs of sources of light that can act as coherent sources are a) Two images of same source b) One source and its image c) Two different parts of same wave front d) All of the above Ans -2: d) All of the above Ques 3 : In interference a) Energy is created at Maxima. b) Energy is destroyed at minima. c) Energy is redistributed from minima to maxima without the movement of medium from minima to maxima . d) Energy is redistributed by movement of the medium from minima to maxima Ans 3: c) Energy is redistributed from minima to maxima without the movement of medium from minima to maxima Ques 4 : When two coherent sources of light interfere a) Maxima is obtained where phase difference is odd multiple of π b) Maxima is obtained where phase difference is even multiple of π c) Minima is obtained where phase difference is even multiple of π d) None of the above Ans 4: b) Maxima is obtained where phase difference is even multiple of π Ques 5 : In Huygens's Double slit experiment the valid equation at minima is a) Path difference = (2n-1)λ/2 b) Path difference = (2n+1)λ/2 c) Path difference = (2n-1)λ d) Path difference = (2n+1)λ Ans 5 : a) Path difference = (2n-1)λ/2 Ques 6 : Intensities of successive maximas due to diffraction from single slit are in the ratio of a) 1: 1/22: 1/64 : 1/122 ….. b) 1 : 1 : 1: …… c) 1: 22 : 64 : 122 ….. d) 1 : 2 : 4 : 8 ……… Ans 6 : a) 1: 1/22: 1/64 : 1/122 ….. Ques 7 : Diffraction is the phenomenon of bending of light a) While passing from one medium to another b) From sharp edges into geometric shadow. c) From sharp edges into geometric image d) From sharp edges into geometric image or shadow. Ans 7: d) From sharp edges into geometric image or shadow. Ques 8 : In diffraction from N no of parallel slits there are …….. Secondary minima and …….. Secondary maxima between two successive principal maxima a) N+1, N+2 b) N, N-1 c) N-1 , N-2 d) N-2, N-1 Ans 8: c) N-1 , N-2 Ques. 9 : Maximum order n of spectrum that can be observed with diffraction grating of grating element (a+b) is given by a) n ≤ λ (a + b) b) n ≤ λ /(a + b) c) n ≥ λ /(a + b) d) n ≤ (a + b) / λ Ans 9: d) n ≤ (a + b) / λ Ques. 10 : Hazarduous effect of laser is the most on a) Skin b) Eyes c) Heart d) Blood Ans 10: b) Eyes Ques 11 : If widths of transparency and opacity are equal then missing order of spectra are a) 2, 4, 6, 8 ………….. b) 1, 5, 9, 13 …. c) 3, 6, 9, ……………….. d) 1, 3 , 5 , 7, Ans 11: a) 2, 4, 6, 8 ………….. Ques 12 : For two objects to be just resolved first minima of one should fall on central maxima of other. This statement was given by a) Einstein. b) Michelson and Morley. c) Rayleigh. d) Newton Ans 12: c) Rayleigh. Ques 13 What would the mass of a 9.11 X 10-31 kg electron be if it were to travel at c? a) Infinite b) 9.11 x 10-31 Kg c) 1.6 x 10-12 Kg d) Zero Ans 13: a) Infinity Ques 14: An observer on a spacecraft moving directly away from the sun is moving at a speed of 0.3 c will find that the light waves pass by him (from behind) at a relative speed of . a) 1.3 c b) c c) 0.7 c d) 0.9c Ans 14: b) c Ques 15: Which experiment was the first compelling evidence in favour of time dilation? a) Muon decay b) The Michelson-Morley interferometer c) Rutherford's Alpha Scattering d) Young's double-slit Ans 15 : a) Muon decay Ques 16: Evidence for conversion of mass into energy and vice versa are a) Nuclear reactor and pair production b) Pair production and Nuclear reactors. c) Hydrogen bomb and atom bomb d) Energy from Sun and Stars Ans16 : a) Nuclear reactor and pair production Ques 17 : Kinetic Energy of a relativistic particle is twice its rest mass energy. a) Moving mass is two times its rest mass b) Moving mass is half of its rest mass. c) Moving mass is three times the rest mass d) Moving and rest mass are always same. Ans 17: c) Moving mass is three times the rest mass Ques 18 : What is the minimum no of energy levels needed for lasing? a) 1 b) 4 c) 2 d) 3 Ans 18: d) 3 Ques 19 : When electrons drops down from a higher energy state and recombine with hole what is produced? a) Gamma ray. b) Phonon. c) Photon. d) Current. Ans 19 : c) Photon. Ques 20 : What particle play major role in the process of lasing. a)Neutron b) Proton. c) Electron. d) Krypton. Ans 20 : c) Electron. Ques 21: Basic difference between three and four level laser is that a) Four level is independent of pumping rate b) Three level is independent of pumping rate c) Four level is independent of pumping power d) Three level is independent of pumping power Ans 21 : a) Four level is independent of pumping rate Ques 22: If a wave can be polarised it must be: a) Electromagnetic Wave b) Longitudinal Wave c) Seismic wave d) Transverse wave Ans 22 : d) Transverse wave Question 23 The relation between Brewster angle λ and critical angle C is a) b) c) d) (sin C) -1 = tan λ Sin C = tan λ C=λ C = 1/ λ Ans. 23 a) (sin C) -1 = tan λ Ques. 24 The wave fronts of Ordinary and Extra-ordinary waves in a crystal are shown in figure. The crystal is a) –ve crystal b) +ve crystal c) Neutral Ans. 24 b) +ve crystal Ques. 25 The wave fronts of Ordinary and Extra-ordinary waves in a crystal are shown in figure. a) b) c) d) Spherial wave front is for O-ray Elliptical wave front is for O-ray Spherial wave front is for E-ray Straight line is for E-ray Ans. 25 a) Spherial wave front is for O-ray Ques. 26 Read Following Statements 1. Optic axis is a line equally inclined to all edges meeting at blunt corners and any line parallel to it is also an optic axis. 2. Velocities of O-ray and E-ray are same in along optic axis a)Only statement 1 is correct. b)Only statement 2 is correct c) Both the statements 1 & 2 are correct d)Statement 1 is correct but statement 2 is not correct Ans. 26 c) Both the statements 1 & 2 are correct Ques. 27 1. Elliptically polarised light is produced when O-ray and E-ray having equal amplitude superimpose over each other and have a path difference of l/4 2. Circularly polarised light is produced when O-ray and E-ray having equal amplitude superimpose over each other and have a path difference of l/4 a) statement 1 is correct. b) statement 2 is correct c) Both the statements 1 & 2 are correct d) None of the above statement are correct Ans. 27 b) Statement 2 is correct Ques. 28 Nicol Prism a)Acts as Polariser and can be used to produce only plane polarised light. b)Acts as Polariser and produces only circulary polarised light. c) Acts as only analyser and produces plane polarised light. d) Can act both as polariser and analyser. Ans. 28 d) Can act both as polariser and analyser. Ques. 29 You send a traveling wave along a particular string by oscillating the string. On increasing the frequency of oscillation i) The Speed of wave increases ii) Wavelength of wave decreases without any change of speed If instead of increasing frequency tension in string is increased iii) Speed of wave decreases iv) Wave length of wave increases a) i) and ii) are correct. b) ii) and iii) are correct c) iii) and iv) are correct d) i) and iv) are correct Ans. 29 d) i) The Speed of wave increases and iv) Wave length of wave increases are correct Ques. 30 a)Optical Path and Geometric path are same. b)Geometric path is always larger than path. c) Geometric path is always less than path. d) Geometric path is always larger than path in Transparent medium. always optical optical optical Ans. 30 d) Geometric path is always larger than optical path in Transparent medium. Ques. 31 According to Einstein postulates of theory of relativity i) Laws of physical phenomenon are same in all Non inertial frames of reference ii) Velocity of light is independent of motion of source and observer iii) Laws of physical phenomenon are same in all inertial frames of reference iv) Velocity of light is independent of motion of source but depends upon motion of observer a) ii) and iii) are correct. b) i) and ii) are correct. c) i) and iv) are correct. d) ii) and iv are correct. Ans. 31 a) ii) Velocity of light is independent of motion of source and observer and iii) Laws of physical phenomenon are same in all inertial frames of reference are correct. Ques. 32 a) In diffraction all fringes are of unequal width and in interference all fringes are of equal width. b) In diffraction all fringes are of equal width and in interference all fringes are of unequal width. c) In diffraction as well interference intensities of all fringes are equal. d) Diffraction and refraction both show that light is transverse in nature Ans. 32 a) In diffraction all fringes are of unequal width and in interference all fringes are of equal width. Ques. 33 If n is the order of spectrum and N is Resolving power of grating is given by • N/n • Nxn • n/N d) l x dl Ans. 33 b) N x n Ques. 34 In relativistic Mechanics energy E and momentum p are related by equation • E2 = p2 c2 + mo2 c4 • E2 = p2 c2 + mo2 c2 • E = p2/2m d) p = (2mE)1/2 Ans. 34 a) E2 = p2 c2 + mo2 c4 Ques. 35 If a thin transparent sheet of refractive index m is introduced in the path of one of the interfering beams the shift in the fringes is given by a) b) c) d ( 1)t D D ( 1)t d D d ( 1)t Ans. 35 a) d ( 1)t D