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Multiple Choice Question (MCQ) of Illumination page-10


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91. The electrodes of neon tubes work at

A) 2000 to 6000 volts
B) 400 to 440 volts
C) ordinary voltages
D) very low temperatures.

Ans : (A)


92. Which of the following surface has the lowest reflection factor for white light ?

A) White oil paint
B) Blue curtains
C) White plaster work
D) Aluminium sheet.

Ans : (B)


93. The illumination required for normal reading is around

A) 500 lumens/m2
B) 300 - 400 lumens/m2
C) 100 - 250 lumens/m2
D) 60 - 100 lumens/m2.

Ans : (A)


94. In neon signs, neon with a mixture of mercury gives

A) yellow colour
B) red colour
C) blue colour
D) green colour.

Ans : (D)


95. In neon signs, helium is used for

A) yellow colour
B) green colour
C) red colour
D) blue colour.

Ans : (A)


96. Glow lamps

A) have hot cathode
B) have cold cathode
C) cannot withstand shocks
D) consume high power.

Ans : (B)


97. Glare is the result of

A) very low luminance
B) normal luminance
C) excessive luminance
D) none of the above.

Ans : (C)


98. An object which appears red to the eyes, absorbs

A) green radiations
B) blue radiations
C) violet radiations
D) all of the above.

Ans : (D)


99. Which of the following lamp has least capacity to sustain voltage fluctuations ?

A) sodium vapour lamp
B) fluorescent lamp
C) incandescent lamp
D) mercury vapour lamp.

Ans : (C)


100. In neon signs argon gas is used for

A) yellow colour
B) blue colour
C) green colour
D) red colour.

Ans : (D)



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