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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
What will be the total flux emitted by a source of 60 candle power?

  None of these.
  754.2 lumens.
 60 lumens.
 0.001326 lumens.

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Illumination
From a uniform light source having luminous intensity of 300 candelas, there exists a plane surface 15 m below. The value of illuminance at a point on the plane surface where the luminous flux rays are inclined at an angle of 30 to the surface is

 58.45 Kilolux.
 17.32 lux.
 1.15 lux.
 1.53 lux.

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Illumination
The range of visual spectrum is

 300nm - 1000nm.
 480nm - 760nm.
 480nm - 1000nm.
 300nm - 760nm.

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Illumination
Which among the following lamps has the maximum burning hours?

 Metal halide.
 LED.
 Incandescent.
 Compact Fluorescent.

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