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Q54 (NDA-I/2015) Science & Technology › New Materials, Energy & Environment-linked Tech › Efficient lighting technologies Answer Verified

We use CFL to save electrical energy and to provide sufficient light. The full form of CFL is

Result
Your answer: —  Â·  Correct: D
Explanation

CFL stands for Compact Fluorescent Lamp. It is a type of energy-efficient lighting designed to replace traditional incandescent bulbs [1]. Unlike incandescent lamps that use a glowing filament to produce light, CFLs utilize fluorescent technology where electricity activates a gas, such as argon and mercury vapor, which then interacts with a phosphor coating inside the tube to emit visible light. The term 'compact' refers to the design where the fluorescent tube is folded or spiraled to fit into the same standard sockets used by incandescent bulbs. CFLs are significantly more efficient, consuming much less power and lasting 6 to 15 times longer than traditional lamps [1]. While they have been widely used to save electrical energy, they are increasingly being replaced by even more efficient Light Emitting Diode (LED) technology [1].

Sources

  1. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 11: Light: Shadows and Reflections > SCIENCE AND SOCIETY > p. 154
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SIMILAR QUESTIONS

IAS · 2011 · Q63 Relevance score: 1.03

What is the difference between a CFL and an LED lamp ? 1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material. 2. The average life span of a CFL is much longer than that of an LED lamp. 3. A CFL is less energy-efficient is compared to an LED lamp. Which of the statements given above is/ are correct?

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