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Semiconductor Electronics: Materials, Devices and Simple Circuits

CBSE · Class 12 · Physics

NCERT Solutions for Semiconductor Electronics: Materials, Devices and Simple Circuits — CBSE Class 12 Physics.

105 questions60 flashcards5 concepts

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A graph showing the current (I) versus voltage (V) characteristics of a p-n junction diode. Include both forward bias (exponential increase after knee voltage) and reverse bias (small reverse saturati
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EXERCISES

14.1In an n-type silicon, which of the following statement is true:Show solution
In an n-type semiconductor, the dopant is pentavalent and the majority carriers are electrons. Therefore, holes are minority carriers. So the correct statement is (c).

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14.2Which of the statements given in Exercise 14.1 is true for p-type semiconductors.Show solution
In a p-type semiconductor, the dopant is trivalent and the majority carriers are holes. Hence the correct statement is (d).

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14.3Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separatedShow solution
From the chapter: the energy gaps are about 5.4 eV for carbon (diamond), 1.1 eV for silicon, and 0.7 eV for germanium. So the order is

(Eg)C>(Eg)Si>(Eg)Ge(E_g)_C > (E_g)_{Si} > (E_g)_{Ge}

Hence the correct option is (c).

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14.4In an unbiased p-n junction, holes diffuse from the p-region to n-region because
14.5When a forward bias is applied to a p-n junction, it
14.6In half-wave rectification, what is the output frequency if the input frequency is 50 Hz. What is the output frequency of a full-wave rectifier for the same input frequency.

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Frequently Asked Questions

What are the important topics in Semiconductor Electronics: Materials, Devices and Simple Circuits for CBSE Class 12 Physics?
Semiconductor Electronics: Materials, Devices and Simple Circuits covers several key topics that are frequently asked in CBSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Semiconductor Electronics: Materials, Devices and Simple Circuits — CBSE Class 12 Physics?
Understand the core concepts first, then work through the 105 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
Where can I get free NCERT Solutions for Semiconductor Electronics: Materials, Devices and Simple Circuits Class 12 Physics?
This page has free step-by-step NCERT Solutions for every exercise question in Semiconductor Electronics: Materials, Devices and Simple Circuits (CBSE Class 12 Physics) — written the way examiners award marks: given, formula, working, answer.

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