UPSC Civil Services 2011 Prelims General Studies Paper I
© examsiri.com
Question : 64 of 100
Marks:
+1,
-0
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 ?
(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 ?
Go to Question: