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Illumination

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

 Metal Halide
 Compact Fluorescent
 LED
 Incandescent

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Illumination
Unit of luminous flux is

  candela.
  steradians.
  lux.
  lumens.

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Illumination
Luminous efficiency of a fluorescence lamp is

 60 lumens / watt.
 30 lumens / watt.
  70 lumens / watt.
  40 lumens / watt.

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Illumination
The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is

  2 / 3.
  3 / 2.
 1 / 3.
 2 / 5.

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Illumination
Total flux or lumens required in any lighting scheme depends inversely on

None of these
  reflection factor.
  utilization factor.
  reduction factor.

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Illumination
The work of ballast in a fluorescent tube is to

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

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MORE MCQ ON Illumination

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