UPSC General Studies Solved Paper - General Studies-2011

  • question_answer
    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 lifespan of a CFL is much longer than of an LED lamp.
    3. A CFL is less energy-efficient as compared to an LED lamp.
    Which of the statement(s) given above is/are correct?

    A)  Only 1             

    B)  2 and 3    

    C)  1 and 3           

    D)  All of these

    Correct Answer: C

    Solution :

    Exp. [c] The lifespan of LEDs is more than that of CFLs and are also more energy efficient. Thus, LEDs are used in traffic signal lights.

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