Transistors and Amplifier MCQs
Transistors and Amplifier MCQs
Class: CBSE Class 12 | Subject: Physics
Section 9: Electronic Devices
Topic: Transistors & Amplifier
Based on CBSE Board Examination Pattern
Section 9: Electronic Devices
Topic: Transistors & Amplifier
Based on CBSE Board Examination Pattern
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination preparation.
1. A transistor has how many semiconductor junctions?
Answer: B
A transistor consists of two PN junctions arranged as PNP or NPN.
A transistor consists of two PN junctions arranged as PNP or NPN.
2. The three terminals of a transistor are:
Answer: B
Emitter emits carriers, base controls, collector collects them.
Emitter emits carriers, base controls, collector collects them.
3. In active region operation:
Answer: C
This biasing allows amplification.
This biasing allows amplification.
4. Current gain in CE configuration is:
Answer: B
β = Ic/Ib is CE current gain.
β = Ic/Ib is CE current gain.
5. Transistor used as amplifier works in:
Answer: C
Linear amplification occurs in active region.
Linear amplification occurs in active region.
6. CE configuration output taken from:
Answer: C
Collector provides amplified output.
Collector provides amplified output.
7. Input applied between:
Answer: A
Controls base current.
Controls base current.
8. Amplifier increases:
Answer: D
Depending on design.
Depending on design.
9. Transistor action based on:
Answer: C
Carrier transport mechanisms.
Carrier transport mechanisms.
10. Silicon transistor VBE ≈
Answer: B
Forward bias requirement.
Forward bias requirement.
11. Base region is:
Answer: B
Allows carrier control.
Allows carrier control.
12. Emitter is:
Answer: B
Supplies carriers efficiently.
Supplies carriers efficiently.
13. Collector region is:
Answer: B
Dissipates heat.
Dissipates heat.
14. CE amplifier phase shift:
Answer: C
Output inverted.
Output inverted.
15. Voltage gain formula:
Answer: A
Approx CE gain expression.
Approx CE gain expression.
16. Transistor as switch works in:
Answer: B
ON/OFF operation.
ON/OFF operation.
17. Power gain =
Answer: A
Defines amplification strength.
Defines amplification strength.
18. AC load line shows:
Answer: B
Operating swing range.
Operating swing range.
19. Q‑point means:
Answer: C
Stable bias position.
Stable bias position.
20. Amplifier distortion occurs when:
Answer: B
Signal exceeds linear range.
Signal exceeds linear range.