Download Vikrant Institute of Technology and Management, Gwalior Physics

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