17-PHYS-A5-B Analog and Digital Electronic
Circuits Exam C
Question 1. Which component is primarily used to store charge in an analog circuit?
A) Resistor
B) Capacitor
C) Inductor
D) Diode
Answer: B
Explanation: Capacitors store electrical energy in an electric field, making them essential for charge
storage in analog circuits.
Question 2. In digital electronics, what does a logic high (1) typically represent?
A) 0 volts
B) A voltage level close to ground
C) A positive voltage close to the supply voltage
D) An alternating current signal
Answer: C
Explanation: A logic high (1) usually corresponds to a voltage close to the supply voltage, enabling digital
logic functions.
Question 3. Which of the following is a non-linear device used in analog circuits?
A) Resistor
B) MOSFET
C) Inductor
D) Capacitor
Answer: B
Explanation: A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) exhibits non-linear
characteristics, useful in amplification and switching.
, 17-PHYS-A5-B Analog and Digital Electronic
Circuits Exam C
Question 4. What is the primary function of a diode in a digital circuit?
A) Amplify signals
B) Rectify current
C) Store charge
D) Filter noise
Answer: B
Explanation: Diodes allow current to flow in one direction, making them essential for rectification and
logic operations.
Question 5. Which device is used to convert analog signals into digital signals?
A) Oscillator
B) Analog-to-digital converter (ADC)
C) Digital-to-analog converter (DAC)
D) Amplifier
Answer: B
Explanation: An ADC converts continuous analog signals into discrete digital signals for processing in
digital systems.
Question 6. In an RC low-pass filter, what is the role of the capacitor?
A) To block high-frequency signals
B) To pass high-frequency signals
C) To amplify the input signal
D) To invert the signal phase
Answer: A
Explanation: The capacitor in an RC low-pass filter blocks high-frequency signals, allowing only low
frequencies to pass.
Question 7. Which logic gate outputs true only when all inputs are true?
A) OR gate
, 17-PHYS-A5-B Analog and Digital Electronic
Circuits Exam C
B) AND gate
C) NAND gate
D) NOR gate
Answer: B
Explanation: The AND gate outputs true only when all its inputs are true, implementing a logical
conjunction.
Question 8. Which of the following is a bipolar analog device?
A) JFET
B) BJT (Bipolar Junction Transistor)
C) MOSFET
D) CMOS
Answer: B
Explanation: BJT (Bipolar Junction Transistor) is a bipolar device utilizing both majority and minority
carriers, used in analog amplification.
Question 9. Which digital logic family is known for low power consumption?
A) TTL
B) ECL
C) CMOS
D) RTL
Answer: C
Explanation: CMOS (Complementary Metal-Oxide-Semiconductor) technology is renowned for its low
power consumption in digital circuits.
Question 10. What does the term 'hysteresis' refer to in digital switching circuits?
A) The delay between input and output
B) The difference in input voltage levels for switching ON and OFF
C) The oscillation frequency
, 17-PHYS-A5-B Analog and Digital Electronic
Circuits Exam C
D) The power consumption during switching
Answer: B
Explanation: Hysteresis refers to the difference in input voltage thresholds for switching states,
preventing noise from causing rapid toggling.
Question 11. Which of the following is a linear analog device?
A) Zener diode
B) Operational amplifier
C) Thyristor
D) SCR
Answer: B
Explanation: Operational amplifiers (op-amps) are linear devices used for amplification and
mathematical operations in analog circuits.
Question 12. In digital logic, what is the function of a flip-flop?
A) To perform logical AND operation
B) To store binary data
C) To amplify digital signals
D) To convert digital signals to analog
Answer: B
Explanation: Flip-flops are bistable devices used to store one bit of digital information, essential in
memory elements.
Question 13. Which of the following is used in analog circuits to filter out high-frequency noise?
A) Resistor
B) Inductor
C) Capacitor
D) Transformer
Answer: C
Circuits Exam C
Question 1. Which component is primarily used to store charge in an analog circuit?
A) Resistor
B) Capacitor
C) Inductor
D) Diode
Answer: B
Explanation: Capacitors store electrical energy in an electric field, making them essential for charge
storage in analog circuits.
Question 2. In digital electronics, what does a logic high (1) typically represent?
A) 0 volts
B) A voltage level close to ground
C) A positive voltage close to the supply voltage
D) An alternating current signal
Answer: C
Explanation: A logic high (1) usually corresponds to a voltage close to the supply voltage, enabling digital
logic functions.
Question 3. Which of the following is a non-linear device used in analog circuits?
A) Resistor
B) MOSFET
C) Inductor
D) Capacitor
Answer: B
Explanation: A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) exhibits non-linear
characteristics, useful in amplification and switching.
, 17-PHYS-A5-B Analog and Digital Electronic
Circuits Exam C
Question 4. What is the primary function of a diode in a digital circuit?
A) Amplify signals
B) Rectify current
C) Store charge
D) Filter noise
Answer: B
Explanation: Diodes allow current to flow in one direction, making them essential for rectification and
logic operations.
Question 5. Which device is used to convert analog signals into digital signals?
A) Oscillator
B) Analog-to-digital converter (ADC)
C) Digital-to-analog converter (DAC)
D) Amplifier
Answer: B
Explanation: An ADC converts continuous analog signals into discrete digital signals for processing in
digital systems.
Question 6. In an RC low-pass filter, what is the role of the capacitor?
A) To block high-frequency signals
B) To pass high-frequency signals
C) To amplify the input signal
D) To invert the signal phase
Answer: A
Explanation: The capacitor in an RC low-pass filter blocks high-frequency signals, allowing only low
frequencies to pass.
Question 7. Which logic gate outputs true only when all inputs are true?
A) OR gate
, 17-PHYS-A5-B Analog and Digital Electronic
Circuits Exam C
B) AND gate
C) NAND gate
D) NOR gate
Answer: B
Explanation: The AND gate outputs true only when all its inputs are true, implementing a logical
conjunction.
Question 8. Which of the following is a bipolar analog device?
A) JFET
B) BJT (Bipolar Junction Transistor)
C) MOSFET
D) CMOS
Answer: B
Explanation: BJT (Bipolar Junction Transistor) is a bipolar device utilizing both majority and minority
carriers, used in analog amplification.
Question 9. Which digital logic family is known for low power consumption?
A) TTL
B) ECL
C) CMOS
D) RTL
Answer: C
Explanation: CMOS (Complementary Metal-Oxide-Semiconductor) technology is renowned for its low
power consumption in digital circuits.
Question 10. What does the term 'hysteresis' refer to in digital switching circuits?
A) The delay between input and output
B) The difference in input voltage levels for switching ON and OFF
C) The oscillation frequency
, 17-PHYS-A5-B Analog and Digital Electronic
Circuits Exam C
D) The power consumption during switching
Answer: B
Explanation: Hysteresis refers to the difference in input voltage thresholds for switching states,
preventing noise from causing rapid toggling.
Question 11. Which of the following is a linear analog device?
A) Zener diode
B) Operational amplifier
C) Thyristor
D) SCR
Answer: B
Explanation: Operational amplifiers (op-amps) are linear devices used for amplification and
mathematical operations in analog circuits.
Question 12. In digital logic, what is the function of a flip-flop?
A) To perform logical AND operation
B) To store binary data
C) To amplify digital signals
D) To convert digital signals to analog
Answer: B
Explanation: Flip-flops are bistable devices used to store one bit of digital information, essential in
memory elements.
Question 13. Which of the following is used in analog circuits to filter out high-frequency noise?
A) Resistor
B) Inductor
C) Capacitor
D) Transformer
Answer: C
