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Multiple Choice Question (MCQ) of Illumination page-4


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32. Which one of the following is a cold cathode lamp ?

A) Tube light
B) Neon lamp
C) Sodium lamp
D) GSL lamp.

Ans : (B)


33. A zero watt lamp consumes

A) No power
B) About 25 to 30 W power
C) About 15 to W power
D) About 5 to 7 W power.

Ans : (D)


34. Melting temperature of tungsten is

A) 3655o K
B) 2655o K
C) 2500o K
D) 2000o K.

Ans : (A)


35. In a mercury vapour lamp light red objects appear black due to

A) absorption of red light by the lamp radiation
B) absence of red light from lamp radiation
C) colour mixing
D) high wavelength of red objects.

Ans : (B)


36. The flicker effect of fluorescent lamps is more pronounced at

A) lower voltages
B) higher voltages
C) lower frequencies
D) higher frequencies.

Ans : (C)


37. The life incandescent lamp is expected to be

A) 100 hours
B) 200 hours
C) 1000 hours
D) 10000 hours.

Ans : (C)


38. The source of illumination for a cinema projector is

A) Carbon arc lamp
B) Sodium lamp
C) Mercury vapour lamp
D) Incandescent lamp.

Ans : (A)


39. Sodium vapour lamps need ionization potential of about

A) 112 volts
B) 100 volts
C) 50 volts
D) 5 volts.

Ans : (D)


40. The frequency of flickers in a fluorescent lamp at 220 V, 50 Hz supply will be

A) 220 per second
B) 100 per second
C) 50 per second
D) 25 per second.

Ans : (B)



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