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Led Questions

Practice 3 Led questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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3
Total Questions
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Easy
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3
Medium
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Practice by Exam:Physics(1)General Science(1)PHYSICS(1)

About LED — practice questions, PYQs & concepts

LED is a frequently-tested topic on Physics, General Science, PHYSICS. ExamTest.live currently lists 3 LED questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

LED weight in competitive exams

Across our LED question bank, the largest sources are Physics (1), General Science (1) and PHYSICS (1). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 0 easy LED questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
  • Time yourself: Every question shows the average solve time so you can benchmark your speed against other students.
  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All Led Questions(1–3 of 3)

Filter:
Q1mediummcqGeneral ScienceCompetitive Exam2026
0% accuracy
2014 Nobel award in Physics is associated with the invention of which type of LED?
Q2mediummcqPHYSICSNEET 20192026
An LED is constructed from a p-n junction diode using . The energy gap is . The wavelength of the light emitted will be equal to:
Q3mediummcqPhysicsJEE Main2026
The characteristic of an LED is:
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Frequently Asked Questions

How many Led questions are on ExamTest.live?▼
We have 3 Led questions spread across 1 pages, covering easy, medium, and hard difficulty levels with detailed explanations.
Are Led MCQs free?▼
Yes. All Led questions, answers, and explanations on ExamTest.live are completely free. No account or subscription required.
Which exams include Led questions?▼
Led questions are commonly asked in Physics, General Science, PHYSICS. You can filter by exam using the links above.
How do I practice Led questions effectively?▼
Start with easy questions to build confidence, then tackle medium and hard ones. Use the filter buttons to sort by difficulty. Reveal the answer only after attempting each question, and read the explanation thoroughly.