BASIC Electronics MCQ’s

By: Prof. Dr. Fazal Rehman | Last updated: April 30, 2025

1. : How many PN junctions are in an SCR?
(A) One
(B) Two
(C) Three
(D) Four

2. : Electrolytic capacitors are of ——— capacitance:
(A) Low
(B) High
(C) Constant
(D) All of these

3. : In a capacitor, when the plate area is increased, the capacitance will:
(A) Increases
(B) Decreases
(C) Unaffected
(D) None of these

4. : SCR is made up of:
(A) Carbon
(B) Germanium
(C) Silicon
(D) Magnesium

5. : Which capacitors can be polarized?
(A) Ceramic
(B) Electrolytic
(C) Mica
(D) Plastic

6. : In a Zener diode, the regulator is kept:
(A) Double bias
(B) Forward bias
(C) Reverse bias
(D) None of these

7. : The logic gate whose output is the complement of its input is:
(A) INVERTER gate
(B) NOR gate
(C) NAND gate
(D) All of these

8. : In amplifiers, the differential gain is:
(A) Moderate
(B) Very low
(C) Very high
(D) None of these

9. : In amplifiers, which feedback is implemented?
(A) Positive feedback
(B) Negative feedback
(C) Both feedback
(D) None of these

10. : Series combination of resistors is:
(A) Its equivalent resistance is equal to individual resistance
(B) Its equivalent resistance is equal to sum of combined resistance
(C) Its equivalent resistance is equal to sum of individual resistance
(D) None of these

11. : The resistivity of a wire depends on:
(A) Length
(B) Diameter
(C) Material
(D) All of these

12. : Ohm’s law cannot be applied on:
(A) Insulators
(B) Conductors
(C) Semi-conductors
(D) Small resistors