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 as compared to an LED lamp. Which of the statements given above is/are correct?
A1 only
B2 and 3 only
C1 and 3 only
D2 and 3
Answer & Solution
Correct answer: C. 1 and 3 only
UPSC CSE Prelims 2011 (GS-I, Set A), Q.64. Official answer key: C.
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