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Illumination

Illumination
Illumination can be expressed in

  candela.
  lux.
  radians.
  lumens.

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Illumination
Candela is the unit of which?

 Frequency.
 Luminous intensity.
 Luminous flux.
 Wavelength.

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Illumination
Wave length for red colour is around

 400 nm.
 500 nm.
 600 nm.
 700 nm.

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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

 17.32 lux.
 1.53 lux.
 58.45 Kilolux.
 1.15 lux.

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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 / 5.
  2 / 3.
 1 / 3.
  3 / 2.

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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

 200.
  30
  150.
 140.

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MORE MCQ ON Illumination

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