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Multiple Choice Question (MCQ) of Illumination page-7


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61. The amount of radiant heat produced by a fluorescent lamp is nearly what percent of that of a filament lamp of same rating

A) 20%
B) 40%
C) 60%
D) 80%.

Ans : (A)


62. Which of the following vapours/gas will give yellow colour in a filament lamp ?

A) Helium
B) Mercury
C) Sodium
D) Magnesium.

Ans : (C)


63. Which of the following phosphor produces green colour

A) Calcium halo phosphate
B) Magnesium tungstate
C) Cadmium borate
D) Zinc silicate.

Ans : (D)


64. Luminous flux is

A) rate of energy radiation in the form of light waves
B) light energy radiated by sun
C) part of light energy, radiated by sun which is received on earth
D) none of the above.

Ans : (A)


65. The level of illumination on a surface depends on

A) candle power of the source
B) distance of the source
C) type of reflector used
D) ambient temperature.

Ans : (D)


66. A lamp has a mean spherical candle power of 25, the total flux of light from the lamp is

A) 25 lumens
B) 25 lumens
C) 314 lumens
D) 625 lumens.

Ans : (C)


67. Which of the following material can be used for the filaments in incandescent lamps is

A) tantalum
B) tungsten
C) carbon
D) any of the above.

Ans : (D)


68. In fluorescent tubes ballast resistance is connected in series with the choke

A) when supply frequency is low
B) to reduce radio interference
C) when tube operates on dc supply
D) to reduce stroboscopic effects.

Ans : (C)


69. While comparing tungsten filament lamps with fluorescent tubes, all of the following are the advantages in favour of tungsten filament lamp EXCEPT

A) Longer life
B) Less costly
C) More brightness
D) Simple installation.

Ans : (A)


70. The melting point of carbon is

A) 1800o C
B) 2200o C
C) 3500o C
D) 5500o C.

Ans : (C)



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