Basic Electronics MCQ Questions and Answers
Basic Electronics MCQ questions with answers cover fundamental topics like resistors, capacitors, diodes, and transistors. These aptitude questions and answers with explanations are highly useful for competitive exams such as GATE, DRDO, and ISRO. Students can practice aptitude test questions to build their understanding of basic electrical laws and circuit behavior. The aptitude questions with solutions PDF helps learners revise important formulas and key concepts effectively. Whether you’re preparing for electronics-based job placements or national-level exams, mastering these questions is essential for scoring high and clearing technical assessments confidently.
Basic Electronics MCQ
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29 questions
21. A semi-conducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be
- A p-n junction
- An intrinsic semi-conductor
- A p-type semi-conductor
- An n-type semi-conductor
22. The transfer ratio beta of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 1 kOhm. The peak value of the co current for an A.C. input voltage of 0.01 V peak is ?
- 100 microA
- 0.01 mA
- 0.25 mA
- 500 microA
23. The cause of the potential barrier in a p-n diode is ?
- Depletion of positive charges near the junction
- Concentration of positive charges near the junction
- Depletion of negative charges near the junction
- Concentration of positive and negative charges near the junction
24. In forward bias, the width of potential barrier in a p-n junction diode?
- increases
- decreases
- remains constant
- first increases then decreases
26. Which of the following when added acts as an impurity into silicon produced n-type semi conductor?
- P
- Al
- B
- Mg
27. In a junction diode, the holes are due to
- protons
- extra electrons
- neutrons
- missing electrons
29. The Keynesian theory of employment provides the solution of?
- Frictional unemployment
- Disguised unemployment
- Cyclical unemployment
- Seasonal unemployment