Digital Electronics MCQ & Objective Questions
Digital Electronics is a crucial subject for students preparing for school and competitive exams in India. Mastering this topic not only enhances your understanding of electronic systems but also significantly boosts your exam scores. Practicing MCQs and objective questions in Digital Electronics helps you identify important concepts and improves your problem-solving skills, making it an essential part of your exam preparation.
What You Will Practise Here
Fundamentals of digital logic design
Binary number systems and conversions
Logic gates and their truth tables
Combinational circuits and their applications
Sequential circuits and flip-flops
Boolean algebra and simplification techniques
Key definitions and important formulas
Exam Relevance
Digital Electronics is a significant topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions related to logic gates, number systems, and circuit design. Common patterns include multiple-choice questions that test both theoretical knowledge and practical applications, making it vital to be well-prepared with important Digital Electronics questions for exams.
Common Mistakes Students Make
Confusing between different types of logic gates and their functions.
Misunderstanding the conversion processes between binary and decimal systems.
Overlooking the importance of truth tables in combinational circuits.
Failing to apply Boolean algebra correctly in simplification problems.
Neglecting the timing diagrams in sequential circuits.
FAQs
Question: What are the key topics I should focus on in Digital Electronics for exams?Answer: Focus on logic gates, number systems, combinational and sequential circuits, and Boolean algebra.
Question: How can I improve my performance in Digital Electronics MCQs?Answer: Regular practice of MCQs and understanding the underlying concepts will greatly enhance your performance.
Start solving practice MCQs today to test your understanding and solidify your knowledge in Digital Electronics. Remember, consistent practice is the key to success in your exams!
Q. What is the typical range of gates in an MSI circuit?
A.
1-10 gates
B.
10-100 gates
C.
100-1000 gates
D.
1000+ gates
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Solution
MSI circuits typically integrate between 10 to 100 gates on a single chip.
Correct Answer:
B
— 10-100 gates
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Q. What is the typical supply voltage for standard TTL logic circuits?
A.
3.3V
B.
5V
C.
12V
D.
15V
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Solution
Standard TTL logic circuits typically operate at a supply voltage of 5V.
Correct Answer:
B
— 5V
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Q. What is the typical supply voltage range for a standard 555 timer?
A.
1.5V to 5V
B.
4.5V to 15V
C.
5V to 20V
D.
10V to 30V
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Solution
The typical supply voltage range for a standard 555 timer is 4.5V to 15V.
Correct Answer:
B
— 4.5V to 15V
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Q. What is the typical voltage level for a logic high in TTL logic?
A.
0V
B.
2.5V
C.
5V
D.
12V
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Solution
In TTL logic, a logic high is typically represented by a voltage level of around 5V.
Correct Answer:
C
— 5V
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Q. What is the value of the hexadecimal number 2A in decimal?
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Solution
2A in hexadecimal equals 2*16^1 + 10*16^0 = 42.
Correct Answer:
A
— 42
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Q. What is the value of the hexadecimal number 2F in decimal?
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Solution
2F in hexadecimal equals 2*16^1 + 15*16^0 = 47 in decimal.
Correct Answer:
A
— 47
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Q. What is the Z-transform used for in digital signal processing?
A.
To analyze continuous-time signals
B.
To convert time-domain signals into frequency-domain
C.
To analyze discrete-time signals
D.
To filter noise from signals
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Solution
The Z-transform is used to analyze discrete-time signals and systems, providing a way to work in the frequency domain.
Correct Answer:
C
— To analyze discrete-time signals
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Q. What programming language is commonly used to design logic for PLDs?
A.
C
B.
VHDL
C.
Python
D.
Java
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Solution
VHDL (VHSIC Hardware Description Language) is commonly used to design logic for PLDs.
Correct Answer:
B
— VHDL
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Q. What programming language is commonly used to design PLD configurations?
A.
C++
B.
VHDL
C.
Python
D.
Java
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Solution
VHDL (VHSIC Hardware Description Language) is commonly used to design PLD configurations, allowing for hardware description and simulation.
Correct Answer:
B
— VHDL
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Q. What type of code converter is used to convert binary numbers to Gray code?
A.
Binary to BCD converter
B.
Binary to Gray code converter
C.
BCD to binary converter
D.
Decimal to binary converter
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Solution
A binary to Gray code converter is specifically designed to convert binary numbers into their corresponding Gray code.
Correct Answer:
B
— Binary to Gray code converter
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Q. What type of code does a binary to Gray code converter produce?
A.
A code that minimizes errors in digital communication
B.
A code that is easier to read
C.
A code that represents numbers in a different base
D.
A code that is used for error detection
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Solution
A binary to Gray code converter produces a code that minimizes errors in digital communication by changing only one bit at a time.
Correct Answer:
A
— A code that minimizes errors in digital communication
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Q. What type of counter is a Johnson counter?
A.
Synchronous counter
B.
Asynchronous counter
C.
Ring counter
D.
Decade counter
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Solution
A Johnson counter is a type of ring counter that uses inverted feedback.
Correct Answer:
C
— Ring counter
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Q. What type of counter is used to count both up and down?
A.
Up counter
B.
Down counter
C.
Up/Down counter
D.
Ring counter
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Solution
An Up/Down counter can count both upwards and downwards based on control signals.
Correct Answer:
C
— Up/Down counter
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Q. What type of multivibrator is used to generate a square wave output?
A.
Astable multivibrator
B.
Monostable multivibrator
C.
Bistable multivibrator
D.
None of the above
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Solution
An astable multivibrator continuously switches between its high and low states, generating a square wave output.
Correct Answer:
A
— Astable multivibrator
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Q. What type of sensor would typically output a voltage proportional to the temperature?
A.
Photodiode
B.
Thermocouple
C.
Resistor
D.
Inductor
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Solution
A thermocouple generates a voltage that is proportional to the temperature difference between its junctions.
Correct Answer:
B
— Thermocouple
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Q. What type of sensor would you use to measure temperature?
A.
Photodiode
B.
Thermistor
C.
Accelerometer
D.
Microphone
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Solution
A thermistor is a type of temperature sensor that changes resistance with temperature variations.
Correct Answer:
B
— Thermistor
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Q. What type of shift register allows data to be shifted in both directions?
A.
Serial-in Serial-out
B.
Parallel-in Parallel-out
C.
Bidirectional Shift Register
D.
Universal Shift Register
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Solution
A Bidirectional Shift Register allows data to be shifted in both left and right directions.
Correct Answer:
C
— Bidirectional Shift Register
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Q. What type of shift register shifts data to the left?
A.
Right shift register
B.
Left shift register
C.
Bidirectional shift register
D.
Universal shift register
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Solution
A left shift register shifts data to the left, moving bits towards the higher order.
Correct Answer:
B
— Left shift register
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Q. What type of signal is typically used in digital circuits?
A.
Analog signal
B.
Digital signal
C.
Continuous signal
D.
Variable signal
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Solution
Digital circuits use digital signals, which represent data in binary form (0s and 1s).
Correct Answer:
B
— Digital signal
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Q. Which bus is used to transfer data between the CPU and memory?
A.
Address bus
B.
Data bus
C.
Control bus
D.
Power bus
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Solution
The data bus is used to transfer data between the CPU and memory, allowing for communication between these components.
Correct Answer:
B
— Data bus
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Q. Which circuit is used to perform multiplication of binary numbers?
A.
Adder
B.
Multiplier
C.
Decoder
D.
Encoder
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Solution
A multiplier circuit is specifically designed to perform multiplication of binary numbers.
Correct Answer:
B
— Multiplier
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Q. Which circuit is used to perform subtraction in digital systems?
A.
Adder
B.
Subtractor
C.
Multiplier
D.
Divider
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Solution
A Subtractor is specifically designed to perform subtraction operations.
Correct Answer:
B
— Subtractor
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Q. Which component is commonly used to interface sensors with microcontrollers?
A.
Resistor
B.
Capacitor
C.
Operational Amplifier
D.
Transistor
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Solution
Operational amplifiers are often used to amplify sensor signals before they are processed by microcontrollers.
Correct Answer:
C
— Operational Amplifier
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Q. Which component is essential for setting the timing interval in a 555 timer?
A.
Inductor
B.
Resistor
C.
Diode
D.
Transistor
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Solution
Resistors and capacitors are essential for setting the timing interval in a 555 timer.
Correct Answer:
B
— Resistor
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Q. Which component is responsible for temporary data storage in a microprocessor?
A.
ROM
B.
RAM
C.
Cache
D.
Registers
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Solution
RAM (Random Access Memory) is responsible for temporary data storage, allowing the processor to access data quickly during operation.
Correct Answer:
B
— RAM
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Q. Which component is used to perform arithmetic operations in digital circuits?
A.
ALU
B.
MUX
C.
Flip-flop
D.
Register
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Solution
An Arithmetic Logic Unit (ALU) is used to perform arithmetic operations in digital circuits.
Correct Answer:
A
— ALU
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Q. Which component is used to set the timing interval in a 555 timer circuit?
A.
Resistor
B.
Capacitor
C.
Inductor
D.
Diode
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Solution
The timing interval in a 555 timer circuit is set by a resistor and a capacitor.
Correct Answer:
B
— Capacitor
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Q. Which configuration of the 555 timer is used for pulse width modulation (PWM)?
A.
Astable mode
B.
Monostable mode
C.
Bistable mode
D.
None of the above
Show solution
Solution
Astable mode of the 555 timer is commonly used for generating pulse width modulation (PWM) signals.
Correct Answer:
A
— Astable mode
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Q. Which device is used to connect multiple computers in a network?
A.
Router
B.
Switch
C.
Modem
D.
Firewall
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Solution
A switch is used to connect multiple computers within a local area network (LAN) and manage data traffic between them.
Correct Answer:
B
— Switch
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Q. Which file system is commonly used for USB flash drives?
A.
NTFS
B.
FAT32
C.
ext4
D.
HFS+
Show solution
Solution
FAT32 (File Allocation Table 32) is commonly used for USB flash drives due to its compatibility with various operating systems.
Correct Answer:
B
— FAT32
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