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Multiple Choice Question (MCQ) of Illumination page-9


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81. The luminous flux reaching the working plane least depends on

A) colour of the working plane surface
B) reflectance of internal surfaces
C) proportion of the room
D) the lumen output of the lamps.

Ans : (A)


82. In case of frosted GLS lamps, frosting of shell is done by

A) salt water
B) acid etching
C) ammonia
D) ozone.

Ans : (B)


83. E-40 caps are generally used for GLS lamps of wattage above

A) 25 W
B) 100 W
C) 300 W
D) 1000 W.

Ans : (C)


84. B-15 size cap for GLS lamp indicates that

A) cap is filled by cement
B) cap is made of brass
C) cap is screw type
D) cap diameter is 15 mm.

Ans : (D)


85. Nitrogen or argon is filled in GLS lamps to

A) reduce the glare
B) improve efficiency
C) change the colour of light
D) retard evaporation of tungsten filament.

Ans : (D)


86. The light output of GLS lamps is normally in the range

A) 10 to 18 lumens/watt
B) 50 to 80 lumens/watt
C) 100 to 180 lumens/watt
D) 200 to 300 lumens/watt.

Ans : (A)


87. To avoid glare

A) object should be viewed from a close vicinity
B) object should be viewed from a distance
C) object should be moved constantly
D) viewer should move constantly.

Ans : (B)


88. Which of the following glass transmits the least amount of light ?

A) Cleat glass
B) Serrated glass
C) Milk glass
D) Opalescent glass.

Ans : (C)


89. Which of the following glass transmits the maximum light ?

A) Milk glass
B) Clear glass
C) Opalescent glass
D) Serrated glass.

Ans : (B)


90. Glare may result from

A) excessive lighting contrast in the field of vision
B) excessive luminance
C) either of (A) or (B) above
D) none of the above.

Ans : (C)



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