Semiconductor Electronics Class 12 Case Study Questions Physics Chapter 14

Download CBSE and ICSE Books in PDF Format

Reading Time: 8 minutes

Last Updated on December 26, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 12 physics. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 12 physics. In this article, you will find case study questions for cbse class 12 physics chapter 14 Semiconductor Electronics.

Chapter	Semiconductor Electronics
Type of Questions	Case Study Questions
Nature of Questions	Competency Based Questions
Board	CBSE
Class	12
Subject	Physics
Unit	Unit 9 Electronic devices
Useful for	Class 12 Studying Students
Answers provided	Yes
Difficulty level	Mentioned
Important Link	Class 12 Physics Chapterwise Case Study

Customised Study Materials for Teachers, Schools and Coaching Institute

Table of Contents

Case Study Questions on Semiconductor Electronics

Questions

Question 1:

A silicon p-n junction diode is connected to a resistor R and a battery of voltage V_B through milliameter (mA) as shown in figure. The knee voltage for this junction diode is V_N = 0.7 V. The p-n junction diode requires a minimum current of 1 mA to attain a value higher than the knee point on the V-I characteristics of this junction diode. Assuming that the voltage V across the junction is independent of the current above the knee point.

A p-n junction is the basic building block of many semiconductors, devices like diodes. Important process occurring during the formation of a p-n junction are diffusion and drift. In an n-type semiconductor concentration of electrons is more as compared to holes. In a p-type semiconductor, concentration of holes is more as compared to electrons.

Semiconductor Electronics Class 12 Case Study Questions Physics Chapter 14 - 1

Read the given passage carefully and give the answer of the following questions:

Q 1. If V_B = 5 V, then what will be the maximum value of R so that the voltage V is above the knee point voltage?

Q 2. If V_B = 5 V, then what will be the value of R in order to establish a current to 6 mA in the circuit?

Q 3. When the diode is reverse biased with a voltage of 6 V and V_bi = 0.63 V, calculate the total potential.

Q 4. If V_B = 6 V, then calculate the power dissipated in the resistor R, when a current of 6 mA flows in the circuit.

Answers

1. Voltage drop across $R$,

$$
V_R=V_B-V_N=5-0.7=4.3 \mathrm{~V}
$$

Given, $\quad I_{\text {min }}=1 \times 10^{-3} \mathrm{~A}$
Maximum value of resistance,

$$
\begin{aligned}
& R_{\max }=\frac{V_R}{I_{\min }}=\frac{4.3}{1 \times 10^{-3}} \\
& \quad=4.3 \times 10^3 \Omega=4.3 \mathrm{k} \Omega
\end{aligned}
$$

2. Given,

$$
\begin{aligned}
I & =6 \mathrm{~mA}=6 \times 10^{-3} \mathrm{~A}_i \\
V_R & =V_B-V_N=5-0.7=4.3 \mathrm{~V} \\
R & =\frac{V_R}{I}=\frac{4.3}{6 \times 10^{-3}}=717 \Omega
\end{aligned}
$$

3. Total potential, $V_t=V_{b i}+V_R=0.63+6=6.63 \mathrm{~V}$

4. Given, $V_B=6 \mathrm{~V} ; V_N=0.7 \mathrm{~V}, V_R=6-0.7=5.3 \mathrm{~V}$

Power dissipated, $P=I \times V_R=\left(6 \times 10^{-3}\right) \times 5.3$

$$
=31.8 \times 10^{-3} \mathrm{~W}=31.8 \mathrm{~mW}
$$

Also check

Case study questions for other chapters of class 12 physics is given below.

We hope the given case study questions for Semiconductor Electronics Class 12 helps you in your learning.

Download eBooks for CBSE Class 12 Physics (Exam Special)

Topics from which case study questions may be asked

Energy Bands in Conductors, Semiconductors, and Insulators (Qualitative Ideas Only)
Intrinsic and Extrinsic Semiconductors
- p-type and n-type Semiconductors
p-n Junction
Semiconductor Diode
- I-V Characteristics in Forward and Reverse Bias
- Application of Junction Diode
- Diode as a Rectifier

A semiconductor acts like an ideal insulator at absolute zero temperature (0 K). It is because the free electrons in the valence band of semiconductors will not carry enough thermal energy to overcome the forbidden energy gap at absolute zero.

For further practice on case study questions related to Semiconductor Electronics Class 12 Physics, we recommend exploring the link given below.

Practice More Case Study Questions on “Semiconductor Electronics”

Frequently Asked Questions (FAQs) on Semiconductor Electronics Case Study Questions

Q1: What are case study questions for CBSE examinations?

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 12 physics chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 12 physics chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.

Q5: How can students effectively prepare for case study questions on “Semiconductor Electronics” for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on “Semiconductor Electronics” class 12 physics into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of “Semiconductor Electronics”.

Q7: By which charge carriers, an intrinsic semiconductor will have conduction?

A7: Electrons and holes.

Q8: How does the resistance of a semiconductor change when heated?

A8: With increase in temperature, a greater number of bonds inside the semiconductor are broken.

Q9: How does an increase in doping concentration affect the width of depletion layer of a p-n junction diode?

A9: The width of depletion layer of a p-n junction diode decreases on an increase in doping concentration.

Q10: What are the two types of semiconductors on the basis of purity?

A10: On the basis of purity, semiconductor can be classified as:
(i) intrinsic semiconductors
(ii) extrinsic semiconductors

Download Customised White Label Study Materials in MS Word Format

We are providing teaching resources to teachers and coaching institute looking for customised study materials in MS word format. Our High-quality editable study material which is prepared by the expert faculties are Highly useful for Teachers, Mentors, Tutors, Faculties, Coaching Institutes, Coaching Experts, Tuition Centers.

Download Product Brochure