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Illumination

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

 Incandescent
 Metal Halide
 Compact Fluorescent
 LED

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Illumination
What is the ratio of illuminance at a point 5m just below a lamp emitting 100 candelas and at a point 5m away from the first point on the same horizontal plane?

 1: 2√2
 1:2
 2√2 : 1
 2:1

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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

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

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Illumination
Wave length for red colour is around

 500 nm.
 400 nm.
 600 nm.
 700 nm.

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Illumination
Which lamp is best suited for lighting an International sports arena?

 Compact Fluorescent
 Metal Halide
 Incandescent
 LED

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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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