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Illumination

Illumination
Candela is the unit of which?

 Wavelength.
 Luminous intensity.
 Frequency.
 Luminous flux.

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

 LED
 Metal Halide
 Incandescent
 Compact Fluorescent

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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 %.
 30 %.
  45 %.
 20 %.

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Illumination
Solid angle is expressed in terms of

 steredians.
 radians.
 radians / meter.
 degree.

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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

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

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Illumination
Which lamps can be directly connected to a solar cell?

 Incandescent
 Compact Fluorescent
 LED
 Metal Halide

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MORE MCQ ON Illumination

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