Chapter 10: Electronics and Communication — Online MCQ Test
PHYSICS · CLASS 12th · Tamil Nadu State Board
Practice Chapter 10: Electronics and Communication with a free chapter-wise online MCQ test.
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.
Chapter 10: Electronics and Communication — Important Questions & Answers
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.
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.
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.
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 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.
This connection makes the diode reverse biased, increasing the barrier and allowing only a very small reverse saturation current.