The reverse of LED is______?
Correct answer: C. Photodiode
- A. Diode
- B. Resistor
- C. Photodiode
- D. Capacitor
Explanation
An LED is a p-n junction that emits light when forward biased, while a photodiode is designed to detect light and is commonly operated in reverse bias. The likely mistake is choosing an ordinary diode because an LED is a type of diode, but the reverse light-detection counterpart is specifically a photodiode.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
Practise Electronics
660 free Electronics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More PN Junction questions
In a common emitter transistor circuit, the emitter base junction and the collector base junction are respectively
A transistor is used as an amplifier because a small change in the base current produces
Silicon is preferred to germanium in most modern devices because silicon
The specially designed semi-conductor diodes used as fast counters in electronic circuits are_______________?
Acceptor and donor impurities donate______________?
The electronic circuits which implement the various logic operations are called_____________?