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Junction Transistors — Practice Quiz

ICSE · Class 12 · Physics

Try a 4-question quiz on Junction Transistors for ICSE Class 12 Physics: tap an answer to check it and see why. 53 questions in the full chapter test.

53 questions35 flashcards7 formulas & key relations5 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?
Key topics in Junction Transistors include Basic idea of a junction transistor, Types of transistors and symbol directions, Transistor action and current relation, Current gain and related parameters. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many practice questions are there for Junction Transistors?
There are 53 questions on Junction Transistors. Try the 4-question sample quiz on this page first; each answer shows an explanation when you tap it.

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

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