Related MCQ Question

• Illumination of one lumen per sq. meter is called  ____________
• A solid angle is expressed in terms of  ____________
• The unit of luminous flux is  ___________
• Incandescent lamps (Filament lamps) operate normally at a power factor of
• The filament of a GLS lamp is made of
• Fine diameter tungsten wires are made by
• What percentage of the input energy is radiated by filament lamps?
• Which of the following lamps is the cheapest for the same wattage?
• The colour of sodium vapour discharge lamp is
• Carbon Arc lamps are commonly used in
• For the same lumen output, the running cost of the fluorescent lamp is
• Filament lamp at starting will take current 
• The purpose of coating the fluorescent tube from inside with white power is
•  The primary function of choke In the fluorescent tube circuit is to
• The lamp that cannot sustain much voltage fluctuations is
• The primary function of capacitor across the supply to the fluorescent tube is to
• Which lamp does not have separate choke?
• For normal reading the illumination level required is around 
• Light is produced In electric discharge lamps by
• A substance which change its electrical resistance when illuminated by light is called
• Which of the following bulbs operates on least power?
• The flicker effect of fluorescent lamps is more pronounced at
• Which of the following applications does not need ultraviolet lamps?
• Which gas can be filled in GLS lamps?
• The gas filled in vacuum filament lamps is
• The vapour discharge tube used for domestic lighting has
• Co-efficient of utilisation depends upon
• Which of the following is present inside the fluorescent tube?
• When an electric bulb is broken it produces bang because
• The level of illumination on a surface least depends on