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Multiple Choice Question (MCQ) of Illumination page-13


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121. A substance which changes its electrical resistance when illuminated by light is called

A) photovoltaic
B) photoelectric
C) photo-conductive
D) none of the above.

Ans : (C)


122. High pressure mercury vapour lamps are generally used in

A) factories
B) railway yards
C) shopping centres
D) all of the above.

Ans : (D)


123. The normal life span of a fluorescent lamp is

A) 7500 hours
B) 1500 hours
C) 1000 hours
D) 500 hours.

Ans : (A)


124. Which of the following is preferred for air conditioned spaces ?

A) GLS lamp
B) Fluorescent tube
C) Mercury vapour lamp
D) Sodium vapour lamp.

Ans : (B)


125. The light output of fluorescent lamps is around

A) 10 lumens/watt
B) 20 lumens/watt
C) 70 lumens/watt
D) 200 lumens/watt.

Ans : (C)


126. The average life of sodium lamps is around

A) 1000 hours
B) 2500 hours
C) 6000 hours
D) 12000 hours.

Ans : (C)


127. High pressure mercury vapour light contains

A) yellow colour
B) blaish white colour
C) red colour
D) white colour.

Ans : (B)


128. The average life high pressure mercury vapour lamps is

A) 500 hours
B) 1000 hours
C) 9000 hours
D) 20,000 hours.

Ans : (C)


129. The colour temperature of day light is around

A) 50 K
B) 160 K
C) 600 K
D) 6000 K.

Ans : (D)



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