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Multiple Choice Question (MCQ) of Illumination page-8


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71. Which of the following filament material has the lowest melting point ?

A) Osmium
B) Tantalum
C) Tungsten
D) Carbon.

Ans : (A)


72. Filament lamps operate normally at a power factor of

A) 0.5 leading
B) unity
C) 0.5 lagging
D) 0.8 lagging.

Ans : (B)


73. Neon gas in sodium vapour lamp

A) changes the colour of light
B) acts as a shield around the filament
C) prevents vaporization of filaments
D) assists in developing enough heat to vaporize the sodium.

Ans : (D)


74. Which of the following is cold cathode lamps ?

A) Neon lamp
B) Low pressure mercury vapour lamp
C) High pressure mercury vapour lamp
D) Sodium vapour lamp.

Ans : (A)


75. Coating or fluorescent lamps

A) Converts visible light into ultra-violet radiations
B) Converts ultra-violet radiations into visible light
C) Reduces glare
D) None of the above.

Ans : (B)


76. Halogen lamps are useful for the illumination of

A) Sports grounds
B) Parks
C) Airports
D) All of the above.

Ans : (D)


77. Which of the following lamp gives nearly monochromatic light ?

A) Sodium vapour lamp
B) GLS lamp
C) Tube light
D) Mercury vapour lamp.

Ans : (A)


78. Material which reflect all wavelengths in the light spectrum appear to be

A) transparent
B) white
C) opaque
D) green to red.

Ans : (B)


79. The advantage of halogen lamp is

A) no depreciation of light output
B) increased operating temperature with increased luminous efficiency
C) reduced dimensions of the lamp
D) all of the above.

Ans : (D)


80. In case of GLS lamps as the supply voltage increases, which of the following decreases ?

A) Lumen output
B) Power consumption
C) Life
D) Efficiency.

Ans : (C)



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