91. Which of the following lamp has last capacity to sustain voltage fluctuations?
(A) sodium vapor lamp
(B) fluorescent lamp
(C) incandescent lamp
(D) mercury vapor lamp.
92. In neon signs argon gas is used for
(A) yellow colour
(B) blue colour
(C) red colour
(D) green colour
93. In neon signs, helium is used for
(A) yellow colour
(B) green colour
(C) red colour
(D) blue colour.
94. In neon signs, neon with a mixture of mercury gives
(A) green colour
(B) blue colour
(C) red colour
(D) yellow colour
95. The electrodes of neon tubes work at
(A) very low temperatures
(B) ordinary voltages
(C) 400 to 440 volts
(D) 2000 to 6000 volts
96. Glare may result from
(A) excessive lighting contrast in the field of vision
(B) excessive luminance
(C) either of (A) or (B) above
(D) none of the above
97. To avoid glare
(A) object should be viewed from a distance
(B) object should be viewed from a close vicinity
(C) object should be moved constantly
(D) viewer should move constantly
98. The light output of GLS lamps is normally in the range
(A) 10 to 18 lumens/watt
(B) 50 to 80 lumens/watt
(C) 100 to 180 lumens/watt
(D) 200 to 300 lumens/watt
99. Nitrogen or argon is filled in GLS lamps to
(A) reduce the glare
(B) improve efficiency
(C) change the color of light
(D) retard evaporation of tungsten filament
100. In case of frosted GLS lamps, frosting of shell is done by
(A) ozone
(B) ammonia
(C) acid etching
(D) salt water
101. The luminous flux reaching the working plane least depends on
(A) the lumen output of the lamps
(B) proportion of the room
(C) reflectance of internal surfaces
(D) color of the working plane surface.
102. Which of the following lamp gives nearly monochromatic light?
(A) Sodium vapor lamp
(B) GLS lamp
(C) Tube light
(D) Mercury vapor lamp
103. Materials which reflect all wavelengths in the light spectrum appear to be
(A) black to white
(B) transparent
(C) opaque
(D) green to red
104. An object which appears red to the eyes, absorbs
(A) green radiations
(B) blue radiations
(C) violet radiations
(D) all of the above
105. Glare is the result of
(A) very low luminance
(B) normal luminance
(C) excessive luminance
(D) none of the above.
