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Illumination

Illumination
The illumination at a point 5 meters below a lamp in 6 lux. The candle power of the lamp is

 200.
  30
 140.
  150.

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Illumination
Which lamp has a negative Colour Rendering Index (CRI)?

 High pressure sodium vapour
 Low pressure sodium vapour
 LED
 Fluorescent

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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.
 17.32 lux.
 1.15 lux.
 1.53 lux.

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

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

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Illumination
___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions.

  Absorption factor.
  Utilization.
  Depreciation.
  Maintenance.

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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.
  12.5 lux.
  13.5 lux.
 17.5 lux.

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