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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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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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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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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