1. What is the primary function of a diode?
a) To amplify signals
b) To rectify signals
c) To filter signals
d) To oscillate signals
Answer: b) To rectify signals
2. Which component stores electrical energy in an electric field?
a) Resistor
b) Inductor
c) Capacitor
d) Transistor
Answer: c) Capacitor
3. In an NPN transistor, the majority charge carriers are:
a) Electrons
b) Holes
c) Neutrons
d) Protons
Answer: a) Electrons
4. Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?
a) Kirchhoff’s Law
b) Ohm’s Law
c) Faraday’s Law
d) Coulomb’s Law
Answer: b) Ohm’s Law
5. The unit of electrical resistance is:
a) Volt
b) Ampere
c) Ohm
d) Farad
Answer: c) Ohm
6. A Zener diode is used for:
a) Rectification
b) Voltage regulation
c) Signal modulation
d) Amplification
Answer: b) Voltage regulation
7. What is the primary characteristic of an ideal voltage source?
a) Infinite resistance
b) Zero resistance
c) Constant current
d) Variable voltage
Answer: b) Zero resistance
8. Which device converts AC to DC?
a) Transformer
b) Rectifier
c) Oscillator
d) Amplifier
Answer: b) Rectifier
9. The power dissipated in a resistor is given by:
a) P = IV
b) P = I²R
c) P = V²/R
d) All of the above
Answer: d) All of the above
10. Which type of transistor has a P-N-P junction?
a) NPN transistor
b) PNP transistor
c) FET
d) JFET
Answer: b) PNP transistor
11. In a capacitor, the energy stored is proportional to:
a) The charge
b) The square of the voltage
c) The capacitance
d) All of the above
Answer: d) All of the above
12. What is the main purpose of a resistor in an electronic circuit?
a) To store energy
b) To resist the flow of current
c) To amplify the signal
d) To rectify the signal
Answer: b) To resist the flow of current
13. A transistor can be used as a:
a) Rectifier
b) Switch
c) Filter
d) Oscillator
Answer: b) Switch
14. Which of the following is a passive component?
a) Transistor
b) Diode
c) Capacitor
d) Operational Amplifier
Answer: c) Capacitor
15. The unit of inductance is:
a) Henry
b) Farad
c) Ohm
d) Volt
Answer: a) Henry
16. A common application of an operational amplifier is:
a) Rectification
b) Integration
c) Modulation
d) Multiplication
Answer: b) Integration
17. What is the main difference between a conductor and an insulator?
a) Conductors have free electrons
b) Insulators have free electrons
c) Conductors are non-metals
d) Insulators are good conductors of electricity
Answer: a) Conductors have free electrons
18. Which material is commonly used for making semiconductors?
a) Copper
b) Silicon
c) Iron
d) Aluminum
Answer: b) Silicon
19. The junction of a PN diode is termed as:
a) Depletion region
b) Conductive region
c) Resistance region
d) Capacitance region
Answer: a) Depletion region
20. Which of the following devices is used to increase or decrease the voltage level in AC circuits?
a) Diode
b) Transformer
c) Transistor
d) Resistor
Answer: b) Transformer
21. An inductor stores energy in the form of:
a) Electric field
b) Magnetic field
c) Heat
d) Light
Answer: b) Magnetic field
22. Which component in a circuit opposes changes in current?
a) Capacitor
b) Inductor
c) Resistor
d) Diode
Answer: b) Inductor
23. What does an ammeter measure?
a) Voltage
b) Current
c) Resistance
d) Power
Answer: b) Current
24. The bandwidth of an amplifier is determined by:
a) The input signal
b) The feedback
c) The frequency response
d) The power supply
Answer: c) The frequency response
25. Which component can be used to block DC but allow AC to pass?
a) Capacitor
b) Resistor
c) Inductor
d) Diode
Answer: a) Capacitor