MHT CET 2026 Physics question

Not in JEE Advanced syllabus

Which one of the following statements is 'WRONG' regarding LED?

(A)LED's have long lifetime if properly manufactured.
(B)Colours produced by LED's do not fade out.
(C)LED's are energy efficient.
(D)Brightness of light emitted by LED cannot be controlled.Correct

Answer: (D)

Solution

A light emitting diode (LED) is a forward-biased p-n junction that emits light by electron-hole recombination. Its advantages: low operational voltage and low power consumption (energy efficient), fast action with no warm-up time, long life if properly manufactured, and the emitted colour does not fade (it is

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Question ID VK-100404