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Illumination

Illumination
Unit of luminous flux is

  steradians.
  candela.
  lux.
  lumens.

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Illumination
Candela is the unit of which?

 Luminous flux.
 Luminous intensity.
 Wavelength.
 Frequency.

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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.
 1.53 lux.
 1.15 lux.
 17.32 lux.

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Illumination
The work of ballast in a fluorescent tube is to

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

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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

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

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

 Metal Halide
 Compact Fluorescent
 Incandescent
 LED

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