50 MCQs with Answers on Electronics and Communication

Q1. Which device is used to convert mechanical energy into electrical energy?

Transmitter

Motor

Transformer

Generator

Q2. What is the unit of capacitance?

Farad

Ohm

Hertz

Volt

Q3. Which device is used to amplify an electrical signal?

Transducer

Oscillator

Transmitter

Amplifier

Q4. What is the unit of magnetic flux?

Ohm

Hertz

Tesla

Weber

Q5. What is the unit of conductance?

Volt

Hertz

Siemens

Ohm

Q6. Which device is used to measure the power in an electrical circuit?

Multimeter

Voltmeter

Wattmeter

Ammeter

Q7. Which device is used to regulate the voltage in a circuit?

Voltage regulator

Frequency regulator

Power regulator

Current regulator

Q8. Which law states that the algebraic sum of the voltages around any closed loop in a circuit is zero?

Joule’s law

Kirchhoff’s law

Faraday’s law

Ohm’s law

Q9. Which device is used to convert an AC signal into a DC signal?

Transformer

Inverter

Rectifier

Transmitter

Q10. What is the full form of FM?

Fast Modulation

Frequency Multiplication

Fast Multiplication

Frequency Modulation

Q11. What is the full form of OLED?

Oxygen Light Emitting Diode

Oxygen Light Emitting Device

Organic Light Emitting Device

Organic Light Emitting Diode

Q12. Which device is used to amplify a weak signal?

Amplifier

Transducer

Transmitter

Oscillator

Q13. Which device is used to convert an analog signal into a digital signal?

Digital-to-analog converter

Rectifier

Inverter

Analog-to-digital converter

Q14. Which device is used to block electric current in one direction?

Diode

Capacitor

Resistor

Transistor

Q15. What is the unit of power?

Watt

Ampere

Volt

Ohm

Q16. What is the unit of frequency?

Volt

Watt

Hertz

Ohm

Q17. What is the unit of electric current?

Watt

Ampere

Volt

Ohm

Q18. What is the unit of inductance?

Volt

Farad

Henry

Watt

Q19. Which device is used to convert a DC signal into an AC signal?

Transmitter

Transformer

Rectifier

Inverter

Q20. What is the unit of resistance?

Ohm

Volt

Watt

Ampere

Q21. What is the unit of electric charge?

Volt

Ohm

Coulomb

Ampere

Q22. What is the unit of electric field strength?

Hertz

Volt/meter

Ohm

Tesla

Q23. What is the unit of wavelength?

Ampere

Farad

Meter

Second

Q24. Which device is used to store electric charge?

Diode

Inductor

Resistor

Capacitor

Q25. Which device is used to increase or decrease the voltage of an electrical signal?

Motor

Transformer

Transmitter

Generator

Q26. What is the full form of AM?

Angle Modulation

Amplitude Modulation

Angle Multiplication

Amplitude Multiplication

Q27. Which device is used to change the frequency of an electrical signal?

Transmitter

Oscillator

Amplifier

Transducer

Q28. Which device is used to measure the frequency of an electrical signal?

Multimeter

Frequency meter

Ammeter

Voltmeter

Q29. What is the unit of magnetic field strength?

Volt

Ohm

Hertz

Tesla

Q30. Which law states that the voltage across a resistor is directly proportional to the current passing through it?

Joule’s law

Kirchhoff’s law

Faraday’s law

Ohm’s law

Q31. Which device is used to convert a digital signal into an analog signal?

Rectifier

Inverter

Analog-to-digital converter

Digital-to-analog converter

Q32. Which law states that the algebraic sum of the currents entering and leaving a node in a circuit is zero?

Ohm’s law

Joule’s law

Faraday’s law

Kirchhoff’s law

Q33. Which law states that the induced electromotive force in a circuit is proportional to the rate of change of magnetic flux?

Joule’s law

Ohm’s law

Kirchhoff’s law

Faraday’s law

Q34. Which device is used to measure the capacitance of a capacitor?

Voltmeter

Ammeter

Multimeter

Capacitance meter

Q35. What is the full form of LED?

Light Emitting Diode

Low Emitting Diode

Low Energy Device

Light Emitting Device

Q36. Which law states that the induced electromotive force in a circuit is proportional to the rate of change of magnetic field?

Faraday’s law

Ohm’s law

Joule’s law

Kirchhoff’s law

Q37. Which device is used to measure the temperature of an object?

Multimeter

Thermometer

Oscilloscope

Voltmeter

Q38. What is the process of converting a digital signal into an analog signal called?

Sampling

Modulation

Decoding

Demodulation

Q39. Which type of waves are used for communication in mobile phones?

Ultraviolet waves

Radio waves

Infrared waves

Microwaves

Q40. Which device is used to measure the intensity of light?

Photometer

Voltmeter

Multimeter

Oscilloscope

Q41. Which device is used to measure the resistance of an electrical component?

Ammeter

Ohmmeter

Multimeter

Voltmeter

Q42. What is the process of converting an analog signal into a digital signal called?

Sampling

Encoding

Modulation

Demodulation

Q43. Which device is used to measure the humidity of the air?

Multimeter

Oscilloscope

Hygrometer

Voltmeter

Q44. What is the unit of frequency?

Hertz

Coulomb

Weber

Tesla

Q45. Which device is used to convert electrical energy into mechanical energy?

Generator

Motor

Transformer

Transmitter

Q46. What is the unit of electric power?

Volt

Watt

Ohm

Ampere

Q47. Which device is used to separate a signal into its different frequency components?

Transmitter

Transducer

Amplifier

Filter

Q48. Which device is used to combine two or more signals into a single signal?

Transmitter

Mixer

Amplifier

Transducer

Q49. What is the unit of magnetic flux density?

Hertz

Weber

Tesla

Ohm

Q50. Which device is used to measure the inductance of an inductor?

Ammeter

Inductance meter

Multimeter

Voltmeter

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