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Multiple Choice Question (MCQ) of Illumination page-5


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41. Wavelength of green colour is nearly

A) 4000 A
B) 4500 A
C) 5000 A
D) 5500 A.

Ans : (D)


42. One Angstrom is

A) 10-6meter
B) 10-8 meter
C) 10-8 cm
D) 10-8 mm.

Ans : (C)


43. A auto transformer used with neon lamp should have

A) high efficiency
B) high step-up ratio
C) high step-down ratio
D) high leakage reactance.

Ans : (D)


44. In a sodium vapour lamp the discharge is first started in the

A) argon gas
B) neon gas
C) nitrogen gas
D) krypton gas.

Ans : (B)


45. When a sodium vapour lamp is switched on, initially the colour is

A) Pink
B) Yellow
C) Green
D) Blue.

Ans : (A)


46. Which of the following colour has a wavelength between green and colour ?

A) Blue
B) Yellow
C) Violet
D) None.

Ans : (B)


47. The purpose of providing a choke in tube light is

A) to eliminate corona effects
B) to avoid radio interference
C) to improve power factor
D) to limit current to appropriate value.

Ans : (D)


48. The level of illumination from a 100 W incandescent lamp will not increase by

A) increasing the supply voltage
B) increasing filament temperature
C) increasing glass shell diameter
D) none of above.

Ans : (C)


49. The rate of evaporation of tungsten filament in a lamp depends on

A) vapour pressure inside
B) exhaust tube diameter
C) glass shell diameter
D) none of the above.

Ans : (A)


50. A gas filled filament bulbs, the gas used is

A) ozone
B) nitrogen
C) helium
D) oxygen.

Ans : (B)



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