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Q.

The full form of CFL is:


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a

Compact fluorescent lamp

b

Constantan filament lamp

c

Closed filament lamp

d

Closed fluorescent 

answer is A.

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Detailed Solution

Concept: Glass is used for both the electrodes and the glass container containing the argon gas and mercury vapour. Because they consume less energy than incandescent bulbs, compact fluorescent light bulbs, or CFLs, were developed to take their place.
1. The electrodes are made of glass, which is then filled with mercury vapour and argon gas.
2. In order to replace incandescent lights, which used a lot of energy, compact fluorescent light bulbs, or CFLs, were produced.
3. Fluorescent lights are those that contain gas and have electrodes on either end. As the travelling electrons go from one electrode to the next, they come into touch with the mercury atoms in the gas, which excite them and cause them to generate visible and ultraviolet light.
4. The glass's white coating absorbs UV light, making it more visible. Fluorescence is the name for this phenomenon. UV rays are stopped by the covering.
5. There are a few different lamp types that use the same principles as fluorescent lamps but do not have a fluorescent coating since the gas within emits mostly visible light.
Thus, the appropriate response choice (1) .
 
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The full form of CFL is: