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Illumination

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

 Compact Fluorescent
 Incandescent
 Metal Halide
 LED

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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?

 6
 4
 5
 2

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Illumination
Solid angle is expressed in terms of

 steredians.
 radians / meter.
 radians.
 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

  12.5 lux.
 17.5 lux.
  13.5 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

  30
 200.
  150.
 140.

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Illumination
Candela is the unit of which?

 Luminous flux.
 Frequency.
 Wavelength.
 Luminous intensity.

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