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Vikrant Institute of Technology and Management, Gwalior Physics Practical’sViva –Voce Test - 2015 Branch (CS/EE/EC) Q.1 Optical fibers are made of A metallic conductor’s B plastic doped with metallic conductors C dielectric material D magnetic oxides Q2 Two typesof lightsources, frequently used in optical fiber are A LED and lasers B torch and electric lamp C match box and lighter D none of these Q.3 Acceptance angle of fiber is given by A sin-1(n1-n2/n1) B sin-1(n1-n2) C sin-1(n2-n1) D sin-1(n1/n2+1) Q.4 He-Ne laser utilizes A three level pumping B four levels pumping C two level pumping D single level pumping Q.5 In He-Ne laser, helium and neon are in the ratio A 1:7 C 1:10 B 7:1 D 10:1 Q.6 He-Ne laser emits the laser beam wavelength A 6000Å B 6328 Å C 7324 Å D 6943 Å Q.7 laser works on the principle of A absorption B spontaneous emission C stimulated emission D all the three Q.8 what is operating voltage of sodium lamp A 440V B 460V C 400V D 420V Q.9 what is collimator A convertedscattered light into parallel beam B converted into parallel beam scattered light C converted scattered light into anti parallel beam D converted scattered light into different angles Q.10 what is eye piece A Magnifier B Microscope C Convex lens D Concave lens Q.11 what are the essential part of spectrometer A prism B prism table C telescope D all these Q.12 Newton’s rings are formed due to the phenomenon of A interference B diffraction C polarization D reflection Q.13 In newton’s rings the diameter of dark rings are proportional to the square root of A natural number B odd natural number C complex number D integer Q.14 Resolving power of grating A increases as the order of spectrum decreases B increases as total number of ruled lines on grating decreases C increases as total number of ruled lines on grating increases D increases as grating element decreases Q.15 numerical aperture is A it is sine of angle of acceptance B it is light gathering ability of an optical fiber C both a and b D none of these Q.16 Refractive index A velocity of light in vacuum to velocity of light in medium B velocity of light in medium to velocity of light in vacuum C velocity of light in air to velocity of light in liquid D velocity of light in vacuum. Q17 Deviation depends on angle of prism A yes B no Q18 central ring in newton’s ring experiment dark due A thickness at the center is zero B thickness at the center is maximum C thickness is not equal zero D thickness approaches to zero Q.19 Rings are circular due A Symmetry between convex lens and glass plate B asymmetry between Plano convex lens and glass plate C symmetry between Plano convex lens and glass plate D varying thickness between Plano convex lens and glass plate Q 20 Resolving power is ability of instrument A combines images of two objects B Separate images of two objects C disperse images of two objects D diffract images of two objects Q 21 Grating element is A e*d B e-d C e+d D e=d Q.22 Solar cell A converts solar energy into light energy B converts chemical energy into electrical energy C converts solar energy into heat energy D converts solar energy into electrical energy Q 23 solar cell works in A forward biasing B revers biasing C requires no biasing D both a and b Q.25 Efficiency of solar cell is ratio of A power delivered to the input power B power output to the input power C power delivered to the input power D input power to the power delivered Q.26 Fill factor in solar cell is A VocIsc / VmIm B VmIsc/VocIm C VmIm/VocIsc D VocIm/IscVm Q.27 Open circuit voltage occurs when A Resistance equal to zero B Resistance not equal to zero C Resistance equal to infinite D Resistance equal to current Q.28 Moment of inertia when A M.I. =MR B M.I. =MR2 C M.I. =MR3 D M.I. =M/R Q.29 Use of fly wheel A to ensure uniform motion in stationary engines B to ensure angular motion in stationary engines C to ensure linear motion in stationary engines D to ensure circular motion in stationary engines Q.30 Radius of gyration is A slop of line from axis of rotation B parallel distance from axis of rotation C perpendicular distance from axis of rotation D tangent distance from axis of rotation Q 31 Moment of inertia depends on A distribution of mass of body B position and direction of axis of rotation C mass of body D all these Q.32What is photodiode A forward biased diode B reverse biased diode C forward and reverse biased diode D p-n junction reverse biased diode Q.33 Photo diode current depends on A intensity of light B frequency of light C wavelength of light D all the above Q.34 Photodiode converts A chemical energy into heat energy B light energy into electrical energy C chemical energy into electrical energy D chemical energy into mechanical energy Q.35 Acceleration due gravity A force between earth and body B force between two bodies C force between earth and body in vacuum D force between earth and body in medium Q.36 Acceleration due gravity depends upon A distance between two bodies B mass of bodies C area of bodies D none of these Q.37 Photodiodes are made of A semiconductor B metals C magnetic materials D none of these Q.38 Distance between source of light and solar cell affected the voltage A Yes B No Q.39 Color of light affects the voltage and current A Yes B No Q.40 Solar radiation has wavelengths range A 300nm -700nm B 500nm- 800nm C 200nm-600nm D 100nm -600nm