Analog and Digital Electronics – Multiple Choice Questions (MCQs)

1. 1. Which of the following is a passive component?

   • A. Resistor
   • B. Transistor
   • C. Diode
   • D. Operational Amplifier

2. 2. A P-N junction diode conducts when it is:

   • A. Reverse biased
   • B. Forward biased
   • C. Unbiased
   • D. Breakdown biased

3. 3. What is the typical forward voltage drop across a silicon diode?

   • A. 0.3 V
   • B. 0.7 V
   • C. 1.2 V
   • D. 5 V

4. 4. A Zener diode is primarily used as a:

   • A. Rectifier
   • B. Amplifier
   • C. Voltage regulator
   • D. Oscillator

5. 5. Which of the following transistor configurations provides current gain without voltage gain?

   • A. Common Base
   • B. Common Emitter
   • C. Common Collector
   • D. Darlington pair

6. 6. The region of operation for a BJT where it acts as an amplifier is:

   • A. Cut-off
   • B. Saturation
   • C. Active
   • D. Breakdown

7. 7. What is the ideal input impedance of an operational amplifier (Op-Amp)?

   • A. Zero
   • B. Infinite
   • C. Low
   • D. High

8. 8. The Op-Amp configuration that provides a non-inverting output with gain greater than or equal to 1 is:

   • A. Inverting amplifier
   • B. Non-inverting amplifier
   • C. Voltage follower
   • D. Integrator

9. 9. Which logic gate produces a HIGH output only when all its inputs are HIGH?

   • A. OR gate
   • B. AND gate
   • C. NOT gate
   • D. XOR gate

10. 10. A NOR gate is equivalent to an OR gate followed by a:

    • A. NOT gate
    • B. AND gate
    • C. NAND gate
    • D. XOR gate

11. 11. The Boolean expression for a 2-input XOR gate is:

    • A. A+B
    • B. A.B
    • C. A⊕B
    • D. A.B'

12. 12. Which of the following is a universal logic gate?

    • A. AND gate
    • B. OR gate
    • C. NAND gate
    • D. XOR gate