Chapter Exam

Chapter 10: Electronics and Communication — Online MCQ Test

Q: What is the main function of a p-n junction diode?

Answer: B. To allow current mainly in one direction — A p-n junction diode acts as a rectifier by permitting current to flow easily in forward bias and blocking it in reverse bias.

Q: Which logic gate gives an output 1 only when both inputs are 1?

Answer: B. AND gate — An AND gate produces output 1 only when all its inputs are 1.

Q: A p-n junction diode is forward biased when the p-side is connected to the ________ terminal of the battery.

Answer: B. positive — In forward bias, the p-side is connected to the positive terminal and the n-side to the negative terminal, reducing the barrier potential.

Q: A full-wave rectifier is preferred over a half-wave rectifier because it ________.

Answer: B. utilizes both halves of the AC cycle — A full-wave rectifier converts both positive and negative half cycles into the same output polarity, making better use of the input signal.

PHYSICS · CLASS 12th · Tamil Nadu State Board

Practice Chapter 10: Electronics and Communication with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th PHYSICS. This chapter covers: This chapter introduces semiconductor physics p-n junction diodes transistors and logic gates. Students examine rectification circuits amplifier operations integrated circuits and.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 10: Electronics and Communication — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th PHYSICS — Chapter 10: Electronics and Communication, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the main function of a p-n junction diode?

A. To amplify alternating current
B. To allow current mainly in one direction ✓
C. To store electric charge
D. To convert light into electricity

Answer: B. To allow current mainly in one direction
A p-n junction diode acts as a rectifier by permitting current to flow easily in forward bias and blocking it in reverse bias.

Which logic gate gives an output 1 only when both inputs are 1?

A. OR gate
B. AND gate ✓
C. NOT gate
D. NAND gate

Answer: B. AND gate
An AND gate produces output 1 only when all its inputs are 1.

A p-n junction diode is forward biased when the p-side is connected to the ________ terminal of the battery.

A. negative
B. positive ✓
C. neutral
D. ground

Answer: B. positive
In forward bias, the p-side is connected to the positive terminal and the n-side to the negative terminal, reducing the barrier potential.

A full-wave rectifier is preferred over a half-wave rectifier because it ________.

A. uses fewer diodes and gives smaller output
B. utilizes both halves of the AC cycle ✓
C. produces only AC output
D. works only with reverse bias

Answer: B. utilizes both halves of the AC cycle
A full-wave rectifier converts both positive and negative half cycles into the same output polarity, making better use of the input signal.

A student connects the p-side of a diode to the negative terminal and the n-side to the positive terminal of a battery. What is the effect on the diode?

A. It is forward biased and conducts strongly
B. It is reverse biased and nearly no current flows ✓
C. It becomes an amplifier
D. It works as a logic gate

Answer: B. It is reverse biased and nearly no current flows
This connection makes the diode reverse biased, increasing the barrier and allowing only a very small reverse saturation current.