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Illumination

Illumination
Candela is the unit of which?

 Wavelength.
 Luminous intensity.
 Frequency.
 Luminous flux.

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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

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

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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?

 2
 4
 5
 6

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Illumination
___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions.

  Absorption factor.
  Depreciation.
  Utilization.
  Maintenance.

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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.
 200.
 140.
  30

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Illumination
Solid angle is expressed in terms of

 degree.
 radians.
 steredians.
 radians / meter.

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