Bias condition for an LED to emit light

This type of question, asked 2 times: 14 May 2024 S1, 16 Apr 2026 S2. All 2 questions below, oldest first.

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Question 1
14 May 2024 S1
19 $For emission of light, a light emitting diode (LED) is$
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Question 2
16 Apr 2026 S2
149 $Which of the following statement is NOT correct in the case of LED? (A) It is a heavily doped p-n junction diode. (B) It emits light only when it is forward biased. (C) It emits light only when it is reverse biased. (D) The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used.$
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Question 1