Chapter Exam

Chapter 15: Semiconductor Electronics Materials Devices and Simple Circuits — Online MCQ Test

Q: The forbidden energy gap in a semiconductor is typically of the order of:

Answer: B. 1 eV — Semiconductors have a small band gap, usually around 1 eV, which allows thermal excitation of electrons at room temperature.

Q: In a reverse-biased p-n junction, the width of the depletion region:

Answer: C. Increases — Reverse bias pulls majority carriers away from the junction, increasing the depletion region width.

Q: Which logic gate gives an output of 0 only when all its inputs are 1?

Answer: C. NAND gate — A NAND gate is the complement of an AND gate, so its output becomes 0 only when all inputs are 1.

PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Chapter 15: Semiconductor Electronics Materials Devices and Simple Circuits with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS. This chapter covers: Focusing on solid-state devices this chapter covers energy bands intrinsic extrinsic semiconductors p-n junction diode rectifiers LEDs photodiodes solar cells and logic gates.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 15: Semiconductor Electronics Materials Devices and Simple Circuits — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS — Chapter 15: Semiconductor Electronics Materials Devices and Simple Circuits, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a characteristic of an intrinsic semiconductor at room temperature?

A. It has a large number of free electrons due to impurity atoms
B. Its conductivity is due to thermally generated electron-hole pairs ✓
C. It behaves like a perfect insulator
D. It contains only holes as charge carriers

Answer: B. Its conductivity is due to thermally generated electron-hole pairs
An intrinsic semiconductor is a pure semiconductor in which conductivity arises from electron-hole pairs generated by thermal energy.

The forbidden energy gap in a semiconductor is typically of the order of:

A. 0.01 eV
B. 1 eV ✓
C. 10 eV
D. 100 eV

Answer: B. 1 eV
Semiconductors have a small band gap, usually around 1 eV, which allows thermal excitation of electrons at room temperature.

In a reverse-biased p-n junction, the width of the depletion region:

A. Decreases
B. Remains zero
C. Increases ✓
D. Becomes negative

Answer: C. Increases
Reverse bias pulls majority carriers away from the junction, increasing the depletion region width.

Which of the following statements is NOT correct about extrinsic semiconductors?

A. They are formed by doping a pure semiconductor
B. Their conductivity is higher than that of intrinsic semiconductors
C. They always have equal number of electrons and holes ✓
D. They may be of n-type or p-type

Answer: C. They always have equal number of electrons and holes
In extrinsic semiconductors, the number of majority and minority carriers is not equal due to doping.

Which logic gate gives an output of 0 only when all its inputs are 1?