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Junction Transistors

ICSE · Class 12 · Physics

Practice quiz for Junction Transistors — ICSE Class 12 Physics. MCQs and questions with answers to test your preparation.

53 questions35 flashcards5 concepts

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Quick Quiz: Junction Transistors

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1

A common-emitter amplifier has input resistance 1.0 kΩ and AC current gain beta(AC) = 40. What is the transconductance g_m?

2

A common-emitter amplifier has beta(AC) = 50, input resistance 2 kΩ, and load resistance 5 kΩ. What is the AC voltage gain?

3

A common-emitter amplifier has beta(AC) = 30 and voltage gain A_V = 600. What is the resistance gain R_out/R_in?

4

In a common-emitter circuit, V_CC = 12 V, I_C = 2 mA, and R_L = 3 kΩ. What is V_CE?

53 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice
3 marks

A common-emitter transistor has I_B = 10 microamperes and I_C = 0.50 mA. What are beta(DC) and alpha(DC) respectively?

Show answer

50 and 0.98

First, beta(DC) = I_C / I_B = 0.50 mA / 10 microamperes = 0.50 / 0.010 = 50. Then I_E = I_B + I_C = 10 microamperes + 0.50 mA = 0.510 mA. So alpha = I_C / I_E = 0.50 / 0.510 ≈ 0.98. The correct option is 50 and 0.98.

2multiple choice
3 marks

A p-n-p transistor carries 2% of emitter charge in the base. If the emitter current is 1.6 mA, what is the collector current?

Show answer

1.568 mA

If 2% is lost in the base, then 98% reaches the collector. So I_C = 0.98 × 1.6 mA = 1.568 mA. The correct option is 1.568 mA.

3multiple choice
3 marks

A common-emitter amplifier has input resistance 665 Ω and transconductance 0.1 S. What is beta(AC)?

Show answer

66.5

Use g_m = beta(AC) / R_in, so beta(AC) = g_m × R_in. Substituting values gives beta = 0.1 × 665 = 66.5. The correct option is 66.5.

4multiple choice
3 marks

A common-emitter transistor has I_B = 105 microamperes and I_C = 2.05 mA. What is beta(DC)?

Show answer

19.5

Use beta(DC) = I_C / I_B. Convert 105 microamperes to 0.105 mA. Then beta = 2.05 / 0.105 ≈ 19.5. The correct option is 19.5.

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Frequently Asked Questions

What are the important topics in Junction Transistors for ICSE Class 12 Physics?
Junction Transistors covers several key topics that are frequently asked in ICSE 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 Junction Transistors — ICSE Class 12 Physics?
Understand the core concepts first, then work through the 53 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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