Q.1 _____ is defined as radiant energy from a hot body which produces the visual sensation upon the human eye.
A. Light
B. Glare
C. Luminous flux
D. none of the above
Ans.: A
Q.2 What is the aim of artificial light?
A. Supplement the day light
B. Even to replace day light completely
C. Both A and B
D. all of the above
Ans.: C
Q.3 The advantages of good lighting system is/are__
A. ensures increase in production
B. Reduces worker’s fatigue,
C. protects worker’s health, eyes and nervous system and accidents
D. all of the above
Ans.: D
Q.4 The light radiations are emitted from within the atom in specific quantity in succession called ____.
A. light quanta
B. photons
C. Both A and B
D. light energy
Ans.: C
Q.5 All the electromagnetic waves have same speed of ______ in free space.
A. 3 x 108 meters/sec
B. 3 x 1010 meters/sec
C. 3 x 1019 meters/sec
D. 3 x 10-8 meters/sec
Ans.: A
Q.6 who had shown light to form a small portion on the electromagnetic spectrum? A. Hooke’s
B. Gauss
C. Maxwell
D. Galileo
Ans.: C
Q.7 Which of the following is correct for the velocity of propagation of the waves?
A. V = λ/f
B. V = λf
C. V = 1/f
D. V = f / λ
Ans.: B
[V = velocity, λ = wavelength, f = frequency]
Q.8 wavelength is expressed in the unit of ____.
A. Meter/ sec
B. Angstrom
C. m/sec2
D. meter
Ans.: B
Q.9 One angstrom is equal to _____meters.
A. 1012
B. 10-10
C. 1010
D. 10-19
Ans.: B
Q.10 Visible spectrum lies in between wavelength of ___.
A. 4000 A.U to 7000 A.U
B. 5000 A.U to 7000 A.U
C. 3000 A.U to 6000 A.U
D. 4000 A.U to 9000 A.U
Ans.: A
Q.11 which of the following has longer wavelength than visible light?
A. Ultraviolet
B. Infra-red radiation
C. Gama rays
D. all of the above
Ans.: B
Q.12 ____ has shorter wavelength than visible light.
A. Infra-red radiation
B. beta rays
C. Ultra violet
D. none of the above
Ans.: C
Q.13 Part of ultraviolet radiations can be converted into visible light by ___.
A. Incandescent body
B. Fluorescent substance
C. Radiating body
D. any of the above
Ans.: B
Q.14 Which of the following is/are natural source of light?
A. Moon
B. stars
C. Planets
D. Sun
Ans.: D
Q.15 Which of the following is correct according to wavelength?
A. Violet, Blue, Green, Yellow, Orange, Red
B. Blue, Violet, Yellow, Red, Orange, Green
C. Green, Yellow, Orange, Red, Violet, Blue
D. Red, Orange, Yellow, Green, Blue, Violet
Ans.: A
Q.16 Luminous flux is defined as the total quantity of ________ from a luminous body like lamp.
A. light energy emitted per second
B. light energy emitted
C. light energy falling on the illuminated surface
D. energy absorb by a luminous body
Ans.: A
Q.17 What is the unit of luminous flux?
A. Candle power
B. Lumens
C. Lux
D. none of the above
Ans.: B
Q.18 _____ is defined as the flux emitted by the source per solid angle.
A. Illumination
B. Luminous flux
C. Luminous intensity
D. Lumen
Ans.: C
Q.19 Unit of luminous intensity is___
A. Lumens
B. Candela
C. Candle power
D. Lux
Ans.: B
Q.20 The _____ defined as the amount of luminous flux given out in a space represented by one unit of solid angle by a source having an intensity of one candle power in all directions.
A. Candle power
B. plane angle
C. lumen
D. solid angle
Ans.: C
Q.21 Lumens is equal to _____
A. Candle power x solid angle
B. Candle power per second
C. solid angle
D. candle power x plane angle
Ans.: A
Q.22 One candle power is equal to __.
A. 8л lumens
B. 4л lumens
C. 2л lumens
D. None of the above
Ans.: B
Q.23 Candle power of the source is defined as the number of lumens emitted by that ________in a given direction.
A. source per unit plane angle
B. candle power per unit solid angle
C. source per unit solid angle
D. candle power per hour
Ans.: C
Q.24 ____ is subtended at a point and is enclosed by two straight lines laying the same plane.
A. Solid angle
B. Plane angle
C. Angle at which light is fall on the surface
D. None of the above
Ans.: B
Q.25 Plane angle is expressed in ____.
A. Angle in radian or Angle in degree
B. in mechanical degree
C. Both A or B
D. In electrical degree
Ans.: A
Q.26 Magnitude of the plane angle is given by____ radians.
A. Ѳ = arc/ radians
B. Ѳ = radius/arc
C. Ѳ = radians/radius
D. Ѳ = arc/radius
Ans.: D
Q.27 One radian is the angle subtended by an arc of a circle whose length is equal to the _____ of that circle.
A. circumference
B. radius
C. diameter
D. area
Ans.: B
Q.28 ___ is the angle generated by the line passing through the point in space and the periphery of the area.
A. Solid angle
B. Plane angle
C. Angle of light source mounted
D. Angle at which light is fall on the surface
Ans.: A
Q.29 Solid angle is measured in __.
A. Radians
B. Degree
C. Steradians
D. all of the above
Ans.: C
Q.30 Magnitude of solid angle is given by__.
A. ω = area/ radius
B. ω = area/ (radius)2
C. ω = area/radians
D. ω = volume / radians
Ans.: B
Q.31 when the light is fall upon the surface, the phenomenon is called as ___, the surface is illuminated.
A. Illumination
B. degree of illumination
C. Illuminance
D. all of the above
Ans.: D
Q.32 Illumination is defined as the luminous flux (number of lumens) falling on the _____.
A. surface
B. surface per unit area
C. surface per unit volume
D. none f the above
Ans.: B
Q.33 Unit of illumination is ___
A. lux
B. meter candle
C. Both A and B
D. Candle power
Ans.: C
Q.34 One lux is equal to __.
A. 1 lumen per square meter
B. 1lumens per area
C. luminous flux per meter
D. none of the above
Ans.: A
Q.35 ______of a light source is the ratio of its mean spherical candle power to its mean horizontal candle power
A. Reflected light
B. Incident light
C. Absorption factor
D. Reduction factor
Ans.: D
Q. 36 The ratio of luminous flux to the power input to a lamp is known as___.
A. Lamp efficiency
B. luminous efficiency
C. Both A and B
D. light falling on the surface
Ans.: C
Q.37 Specific consumption is the ratio of _____ to the source of light to its ______.
A. power output, luminous flux
B. power input, luminous intensity
C. luminous flux, luminous intensity
D. power output, luminous intensity
Ans.: B
Q.38 Unit of specific consumption is___
A. watt per hours
B. candle power per hours
C. watt per candle power
D. none of the above
Ans.: C
Q.39 Lamp efficiency is measured in ___.
A. Lumens per watt
B. watt per lumen
C. lumens per candle power
D. watt per lux
Ans.: A
Q.40 __ is defined as luminous intensity per unit projected area of either a surface is source light or illuminated surface.
A. Brightness
B. Luminance
C. illumination
D. Both A and B
Ans.: D
Q.41 The brightness within the field of vision of such a character as to cause discomfort, interference with vision or eye fatigue is called___.
A. Glare
B. bad lighting
C. reflected light
D. all of the above
Ans.: A
Q.42 Brightness is measured in __.
A. candle per meter
B. meter per candle
C. candle per meter square
D. candle power per unit area
Ans.: C
Q.43 Utilization factor or coefficient of utilization is the ratio of __.
A. total lumens reaching the working plane to the total lumens given out the lamp
B. total lumens reaching the working plane to total light absorbed by the surface
C. total lumens given out by the lamp to the total lumens reaching the working plane
D. none of the above
Ans.: A
Q.44 Utilization factor is ___.
A. more than unity
B. unity
C. less than unity
D. any of the above
Ans.: C
Q.45 The value of utilization factor for direct lighting is ____ and for indirect lighting is ___.
A. 0.1 to 0.3, 0.25 to 0.5
B. 0.25 to 0.5, 0.1 to 0.5
C. 0.5 to 0.8, 0.1 to 0.5
D. 0.25 to 0.5, 0.1 to 0.3
Ans.: D
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