Attempt this previous-year question. The correct option stays hidden until you choose.
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 semiconductor material.
2. The average lifespan of a CFL is much longer than that of an LED lamp.
3. A CFL is less energy-efficient as compared to an LED lamp.
Which of the statements given above is/are correct?
Pick an option to check yourself.
• Correct Answer: C
• CFL uses mercury vapour and phosphor; LED uses semiconductor material (electroluminescence).
• LED lifespan (25,000–50,000 hours) exceeds CFL (~8,000–10,000 hours); CFL wastes ~80% energy as heat.
Attempt Prelims MCQs or open Mains questions by paper — then continue the same bank inside the app with visual decks.
GyanGram