Illumination Multiple Choice Questions and Answers


1.  Illumination of one lumen per square metre is called


   A. Lumen metre

   B. Lux

   C. Candela

   D. Foot candle


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B. Lux

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2.  The illumination at the various points on a horizontal surface illuminated by the same source varies as


   A. Cos θ

   B. Cos 2 θ

   C. Cos 3 θ

   D. 1/cos θ


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C. Cos 3 θ

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3.  In houses the illumination is in the range of


   A. 2 to 5 lumens per watt

   B. 15 to 20 lumens per watt

   C. 40 to 45 lumens per watt

   D. 60 to 65 lumens per watt


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D. 60 to 65 lumens per watt

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4.  due to Moonlight illumination is nearly


   A. 3000 lumens/m2

   B. 300 lumen/m2

   C. 30 lumen/metres2

   D. 0.3 lumen/m2

   E.None of the above


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D. 0.3 lumen/m2

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5.  For normal reading the illumination level required is around


   A. 22 to 40 lumens/m2

   B. 60 to 100 lumens/m2

   C. 200 to 300 lumens/m2

   D.Any of the above


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B. 60 to 100 lumens/m2

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