1. Which component is commonly used to amplify weak signals in electronic circuits? A) Capacitor B) Inductor C) Transistor D) Diode Answer: C) Transistor 2. What is the function of a Schottky diode in electronic circuits? A) Voltage regulation B) Signal rectification C) Signal amplification D) Frequency modulation Answer: B) Signal rectification 3. Which instrument is used to measure the inductance of a coil? A) Multimeter B) Oscilloscope C) LCR meter D) Frequency counter Answer: C) LCR meter 4. In an electronic circuit, what does “ground” typically refer to? A) A reference point with zero voltage B) Maximum voltage level C) Resistance to current flow D) Voltage output Answer: A) A reference point with zero voltage 5. Which type of diode is commonly used for voltage regulation? A) Zener diode B) Schottky diode C) Light-emitting diode (LED) D) Varactor diode Answer: A) Zener diode 6. What is the primary function of a transformer in electronics? A) Regulate current B) Convert DC to AC C) Control resistance D) Step up or step down voltage Answer: D) Step up or step down voltage 7. Which electronic component is used to filter out high-frequency noise from a signal? A) Capacitor B) Inductor C) Transistor D) Diode Answer: A) Capacitor 8. What does the term “hysteresis” refer to in electronic systems? A) Frequency modulation B) Nonlinear response to input changes C) Voltage regulation D) Signal amplification Answer: B) Nonlinear response to input changes 9. Which type of circuit is used to store and process binary data in computers? A) Comparator B) Flip-flop C) Op-amp D) Oscillator Answer: B) Flip-flop 10. What is the purpose of a heat sink in electronic devices? A) Increase resistance B) Regulate voltage C) Dissipate heat D) Store energy Answer: C) Dissipate heat 11. What is the primary function of a NAND gate in digital logic circuits? A) Addition B) Multiplication C) AND operation D) NOT operation Answer: C) AND operation 12. Which component is used to store data temporarily in a digital circuit? A) Flip-flop B) Inductor C) Capacitor D) Resistor Answer: A) Flip-flop 13. What is the role of a microcontroller in electronic systems? A) Regulate voltage B) Amplify signals C) Process and control data D) Store digital data Answer: C) Process and control data 14. Which of the following is an example of a passive electronic component? A) Transistor B) Diode C) Op-amp D) Microcontroller Answer: B) Diode 15. In a digital circuit, what does “logic low” typically represent? A) Voltage above a certain threshold B) Ground connection C) No voltage D) Variable voltage Answer: C) No voltage 16. What does the term “frequency modulation” (FM) refer to in electronics? A) Modulating voltage levels B) Modulating current levels C) Modulating frequency of a carrier signal D) Modulating resistance Answer: C) Modulating frequency of a carrier signal 17. Which instrument is used to measure the frequency of an electronic signal? A) Oscilloscope B) Multimeter C) Function generator D) Frequency counter Answer: D) Frequency counter 18. What is the purpose of a capacitor in an AC circuit? A) Store energy B) Regulate voltage C) Block DC current D) Control frequency Answer: C) Block DC current 19. Which electronic component is used to amplify or attenuate signals based on frequency? A) Transistor B) Capacitor C) Inductor D) Operational amplifier Answer: C) Inductor 20. What does the term “EMI” stand for in electronics? A) Electronic Master Interface B) Electromagnetic Interference C) Electrical Module Integration D) Energy Manipulation Interface Answer: B) Electromagnetic Interference 21. What is the purpose of using a potentiometer in a circuit? A) To measure voltage B) To generate sine waves C) To control current flow D) To vary resistance or voltage Answer: D) To vary resistance or voltage 22. Which component is commonly used to store and maintain data in digital systems? A) Microcontroller B) Capacitor C) Inductor D) Flip-flop Answer: D) Flip-flop 23. In an AC (Alternating Current) circuit, what is the frequency of the voltage or current? A) Constant B) Varies with time C) Zero D) Infinite Answer: B) Varies with time 24. What does the term “transient response” refer to in electronics? A) Sudden changes in voltage levels B) Stable current flow C) Resistance to temperature changes D) Decay of a signal over time Answer: A) Sudden changes in voltage levels 25. Which of the following is a common application of a Schmitt trigger circuit? A) Signal filtering B) Signal amplification C) Signal conversion D) Signal conditioning Answer: D) Signal conditioning 26. What is the function of a relay in electronic circuits? A) Store energy B) Amplify signals C) Switch high currents using a low-power signal D) Control voltage levels Answer: C) Switch high currents using a low-power signal 27. Which type of sensor is commonly used to detect light intensity in electronic systems? A) Thermocouple B) Photodiode C) Accelerometer D) Pressure sensor Answer: B) Photodiode 28. What does the term “PWM” stand for in electronics? A) Pulse Width Modulation B) Power Wave Measurement C) Phase Width Modulation D) Pulse Wave Modulation Answer: A) Pulse Width Modulation 29. Which component is used to protect electronic circuits from voltage spikes or surges? A) Transistor B) Zener diode C) Operational amplifier D) Flip-flop Answer: B) Zener diode 30. What is the primary function of an operational amplifier (op-amp) in electronic circuits? A) Store digital data B) Regulate voltage C) Amplify and manipulate analog signals D) Convert digital signals to analog Answer: C) Amplify and manipulate analog signals 31. What is the unit of capacitance? A) Ampere (A) B) Farad (F) C) Ohm (Ω) D) Volt (V) Answer: B) Farad (F) 32. Which component is commonly used as a voltage-controlled switch? A) Diode B) Transistor C) Capacitor D) Resistor Answer: B) Transistor 33. What does the acronym “LED” stand for in electronics? A) Light Emitting Diode B) Low Energy Device C) Liquid Electrical Display D) Long-lasting Electronic Device Answer: A) Light Emitting Diode 34. Which of the following is an example of an analog signal? A) Digital clock display B) Morse code C) Music from a vinyl record D) Text message Answer: C) Music from a vinyl record 35. What is the primary function of a diode in electronic circuits? A) Store electrical energy B) Regulate voltage C) Control current flow in one direction D) Amplify signals Answer: C) Control current flow in one direction 36. Which type of circuit provides an output that switches between two voltage levels based on input conditions? A) Comparator B) Oscillator C) Amplifier D) Filter Answer: A) Comparator 37. What does the term “grounding” refer to in electronics? A) Connecting a circuit to Earth B) Increasing voltage levels C) Decreasing resistance D) Converting analog signals to digital Answer: A) Connecting a circuit to Earth 38. Which component is used to store and release electrical charge in a circuit? A) Resistor B) Inductor C) Capacitor D) Transistor Answer: C) Capacitor 39. What is the purpose of a resistor in an electronic circuit? A) Amplify signals B) Store energy C) Control current flow and voltage levels D) Convert digital signals to analog Answer: C) Control current flow and voltage levels 40. Which instrument is used to generate precise and stable frequencies in electronics testing? A) Oscilloscope B) Multimeter C) Function generator D) Logic analyzer Answer: C) Function generator 41. What is the function of an oscilloscope in an electronics laboratory? A) Measure resistance B) Display waveform and voltage changes over time C) Control current flow D) Generate sine waves Answer: B) Display waveform and voltage changes over time 42. Which component is commonly used to regulate voltage in electronic circuits? A) Transistor B) Capacitor C) Diode D) Voltage regulator IC Answer: D) Voltage regulator IC 43. What does the term “breadboarding” refer to in electronics? A) Making bread crumbs B) Designing electronic circuits on a breadboard C) Soldering components together D) Writing code for microcontrollers Answer: B) Designing electronic circuits on a breadboard 44. Which of the following is an example of a passive electronic component? A) Transistor B) Capacitor C) Microcontroller D) Operational amplifier Answer: B) Capacitor 45. What is the purpose of using a multimeter in electronics testing? A) To measure voltage, current, and resistance B) To display waveforms C) To control temperature D) To generate signals Answer: A) To measure voltage, current, and resistance 46. In a digital circuit, what does “logic high” typically represent? A) Voltage above a certain threshold B) Ground connection C) No voltage D) Variable voltage Answer: A) Voltage above a certain threshold 47. Which type of circuit amplifies signals without inverting them? A) Inverting amplifier B) Non-inverting amplifier C) Comparator D) Oscillator Answer: B) Non-inverting amplifier 48. What is the primary function of a transistor in electronic circuits? A) Store digital data B) Regulate voltage C) Amplify or switch electronic signals D) Convert analog signals to digital Answer: C) Amplify or switch electronic signals 49. Which electronic component is used to store electrical energy in a circuit? A) Transistor B) Inductor C) Resistor D) Diode Answer: B) Inductor 50. What is the purpose of a voltage divider circuit? A) To amplify voltage B) To divide voltage into smaller parts C) To control current flow D) To generate square waves Answer: B) To divide voltage into smaller parts

Electronics Laboratory MCQs

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