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Illumination

Illumination
Unit of luminous flux is

  lux.
  lumens.
  steradians.
  candela.

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Illumination
A 200 candle power lamp is hung 4 m above the centre of circular area of 5 m diameter. The illumination at centre of the area is

  13.5 lux.
 17.5 lux.
  12.5 lux.
 18.5 lux.

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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

 200.
  30
  150.
 140.

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Illumination
A 1000 W bulb fitted with a reflector illuminates an area of 3 m x 3 m with an average illumination of 450 lux. If the bulb has and efficiency of 9 lumens / watt the efficiency of the reflector is

  70 %.
 20 %.
 30 %.
  45 %.

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Illumination
Illumination can be expressed in

  lux.
  radians.
  lumens.
  candela.

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Illumination
Which lamp is best suited for lighting an International sports arena?

 Incandescent
 LED
 Compact Fluorescent
 Metal Halide

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MORE MCQ ON Illumination

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