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Illumination

Illumination
Solid angle is expressed in terms of

 radians.
 radians / meter.
 degree.
 steredians.

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Illumination
What will be the number of lamps, each having 300 lumens, required to obtain an average illuminance of 50 lux on a 4m × 3m rectangular room?

 5
 6
 2
 4

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Illumination
Which cells in the eye are responsible for scotopic vision?

 Cone cells
 Rod cells
 Both ‘a’ and ‘b’
 None of these

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Illumination
The work of ballast in a fluorescent tube is to

 provide a kick start when voltage is induced.
 both ‘a’ and ‘b’.
 None of these.
 limit the flow of current.

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Illumination
The illumination at a point 5 meters below a lamp in 6 lux. The candle power of the lamp is

  150.
  30
 140.
 200.

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Illumination
The illumination of the surface varies directly with cosine of the angle between normal to surface and direction of the inclined light is given by

 both A and B.
 Lambert’s cosine law.
None of these
 law of square inverse.

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