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Illumination

Illumination
Solid angle is expressed in terms of

 steredians.
 radians.
 radians / meter.
 degree.

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Illumination
Which cells in the eye are responsible for scotopic vision?

 Cone cells
 Both ‘a’ and ‘b’
 Rod cells
 None of these

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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

  45 %.
 20 %.
 30 %.
  70 %.

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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?

 4
 2
 6
 5

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Illumination
What will be the total flux emitted by a source of 60 candle power?

  754.2 lumens.
 60 lumens.
  None of these.
 0.001326 lumens.

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Illumination
What is the work of a driver in case of an LED?

 Both ‘a’ and ‘b’
 To convert AC to DC
 None of these
 To convert DC to AC

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