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 function of a decoder in combinational logic?
A.
To encode data
B.
To convert binary to decimal
C.
To select a specific output line
D.
To perform addition
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Solution
A decoder converts binary input into a unique output line, effectively selecting one of many outputs based on the input combination.
Correct Answer:
C
— To select a specific output line
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Q. What is the function of a decoder in digital logic?
A.
To convert binary data to decimal
B.
To select a specific output line based on input
C.
To perform addition of binary numbers
D.
To store data temporarily
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Solution
A decoder takes binary input and activates one specific output line corresponding to the input value.
Correct Answer:
B
— To select a specific output line based on input
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Q. What is the function of a firewall?
A.
To speed up internet connection
B.
To protect against unauthorized access
C.
To store data securely
D.
To manage network traffic
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Solution
A firewall is a security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
Correct Answer:
B
— To protect against unauthorized access
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Q. What is the function of a multiplexer?
A.
To amplify signals
B.
To select one of many inputs and forward it to a single output
C.
To perform binary addition
D.
To store data temporarily
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Solution
A multiplexer selects one of several input signals and forwards the selected input into a single line.
Correct Answer:
B
— To select one of many inputs and forward it to a single output
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Q. What is the function of a NOT gate?
A.
Inverts the input
B.
Outputs the same input
C.
Combines inputs
D.
None of the above
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Solution
A NOT gate inverts its input; if the input is 1, the output is 0, and vice versa.
Correct Answer:
A
— Inverts the input
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Q. What is the function of a pull-up resistor in a switch circuit?
A.
To increase current
B.
To ensure a defined logic level when the switch is open
C.
To decrease voltage
D.
To store charge
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Solution
A pull-up resistor ensures that a defined logic level (high) is present when the switch is open.
Correct Answer:
B
— To ensure a defined logic level when the switch is open
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Q. What is the function of a testbench in HDL?
A.
To synthesize the design
B.
To simulate the design
C.
To implement the design
D.
To document the design
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Solution
A testbench is used to simulate the design and verify its functionality by applying test inputs and observing outputs.
Correct Answer:
B
— To simulate the design
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Q. What is the function of an operating system?
A.
To manage hardware and software resources
B.
To provide internet access
C.
To run applications only
D.
To store data permanently
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Solution
An operating system manages hardware and software resources and provides a user interface.
Correct Answer:
A
— To manage hardware and software resources
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Q. What is the function of registers in a microprocessor?
A.
To store permanent data
B.
To hold temporary data and instructions
C.
To manage power supply
D.
To connect to external devices
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Solution
Registers are small storage locations within the microprocessor that hold temporary data and instructions for quick access during processing.
Correct Answer:
B
— To hold temporary data and instructions
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Q. What is the function of the 'TCON' register in the 8051?
A.
Timer control
B.
Interrupt control
C.
Serial communication
D.
Port control
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Solution
'TCON' is the timer control register that also manages interrupt control in the 8051 microcontroller.
Correct Answer:
B
— Interrupt control
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Q. What is the function of the bus in a microprocessor system?
A.
To store data
B.
To connect different components
C.
To execute instructions
D.
To manage power supply
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Solution
The bus in a microprocessor system serves to connect different components, allowing data and control signals to be transmitted between them.
Correct Answer:
B
— To connect different components
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Q. What is the function of the PSEN pin in the 8051 microcontroller?
A.
Program Store Enable
B.
Power Supply Enable
C.
Peripheral Select Enable
D.
Program Select Enable
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Solution
The PSEN pin is used for Program Store Enable in the 8051 microcontroller.
Correct Answer:
A
— Program Store Enable
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Q. What is the Gray code equivalent of the binary number 1101?
A.
1011
B.
1110
C.
1000
D.
1010
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Solution
To convert binary 1101 to Gray code, the first bit remains the same (1), and each subsequent bit is found by XORing the current bit with the previous bit: 1 XOR 1 = 0, 1 XOR 0 = 1, 0 XOR 1 = 1, resulting in Gray code 1011.
Correct Answer:
A
— 1011
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Q. What is the main advantage of BiCMOS logic?
A.
High speed and low power
B.
Low cost
C.
Simplicity
D.
High noise margin
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Solution
BiCMOS combines the advantages of both bipolar and CMOS technologies, offering high speed and low power consumption.
Correct Answer:
A
— High speed and low power
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Q. What is the main advantage of BiCMOS over standard CMOS?
A.
Higher speed
B.
Lower cost
C.
Lower power consumption
D.
Simpler design
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Solution
BiCMOS combines the high speed of bipolar transistors with the low power consumption of CMOS, providing a significant speed advantage.
Correct Answer:
A
— Higher speed
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Q. What is the main advantage of ECL over TTL?
A.
Lower power consumption
B.
Higher speed
C.
Higher noise margin
D.
Lower cost
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Solution
ECL (Emitter-Coupled Logic) is faster than TTL due to its unique design that allows for quicker signal transitions.
Correct Answer:
B
— Higher speed
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Q. What is the main advantage of using a D Flip-Flop over an SR Flip-Flop?
A.
Simplicity
B.
No invalid states
C.
Higher speed
D.
Lower power consumption
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Solution
The D Flip-Flop eliminates the invalid state issue present in the SR Flip-Flop, making it more reliable for data storage.
Correct Answer:
B
— No invalid states
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Q. What is the main advantage of using a microcontroller with built-in ADC?
A.
Lower cost
B.
Higher speed
C.
Reduced complexity in design
D.
Increased power consumption
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Solution
Using a microcontroller with built-in ADC reduces complexity in design by eliminating the need for external ADC components.
Correct Answer:
C
— Reduced complexity in design
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Q. What is the main advantage of using a multiplexer in digital circuits?
A.
Reduces the number of data lines
B.
Increases the speed of data processing
C.
Simplifies circuit design
D.
All of the above
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Solution
Multiplexers help reduce the number of data lines, increase processing speed, and simplify circuit design.
Correct Answer:
D
— All of the above
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Q. What is the main advantage of using a parallel-in parallel-out shift register?
A.
Faster data processing
B.
Lower power consumption
C.
Simpler design
D.
Higher data capacity
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Solution
The main advantage of a parallel-in parallel-out shift register is faster data processing since all bits are entered simultaneously.
Correct Answer:
A
— Faster data processing
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Q. What is the main advantage of using a sigma-delta ADC?
A.
High speed
B.
Low power consumption
C.
High resolution
D.
Low cost
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Solution
Sigma-delta ADCs are known for their high resolution, making them suitable for precise measurements.
Correct Answer:
C
— High resolution
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Q. What is the main advantage of using an FIR filter over an IIR filter?
A.
FIR filters are easier to implement
B.
FIR filters can have a linear phase response
C.
FIR filters require less computational power
D.
FIR filters are always more efficient
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Solution
FIR filters can be designed to have a linear phase response, which preserves the wave shape of filtered signals.
Correct Answer:
B
— FIR filters can have a linear phase response
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Q. What is the main advantage of using CMOS technology in digital circuits?
A.
High speed
B.
Low power consumption
C.
High cost
D.
Complex design
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Solution
The main advantage of CMOS technology is its low power consumption.
Correct Answer:
B
— Low power consumption
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Q. What is the main advantage of using integrated circuits over discrete components?
A.
Higher power consumption
B.
Larger size
C.
Lower cost and increased reliability
D.
More complex design
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Solution
Integrated circuits offer lower cost and increased reliability due to their compact size and reduced number of interconnections.
Correct Answer:
C
— Lower cost and increased reliability
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Q. What is the main advantage of using MSI circuits over SSI circuits?
A.
Lower cost
B.
Higher speed
C.
Greater integration density
D.
Simpler design
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Solution
The main advantage of MSI circuits over SSI circuits is greater integration density, allowing more functions in a smaller space.
Correct Answer:
C
— Greater integration density
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Q. What is the main advantage of using MSI circuits?
A.
Lower power consumption
B.
Higher speed
C.
Reduced size and complexity
D.
Increased cost
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Solution
The main advantage of MSI circuits is the reduced size and complexity, allowing for more compact designs.
Correct Answer:
C
— Reduced size and complexity
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Q. What is the main advantage of using SSDs over HDDs?
A.
Lower cost
B.
Higher durability
C.
Larger storage capacity
D.
Slower access times
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Solution
The main advantage of SSDs over HDDs is higher durability, as SSDs have no moving parts and are less prone to mechanical failure.
Correct Answer:
B
— Higher durability
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Q. What is the main characteristic of combinational logic circuits?
A.
Output depends on past inputs
B.
Output depends only on current inputs
C.
Output is always constant
D.
Output is random
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Solution
In combinational logic circuits, the output depends only on the current inputs, not on past inputs.
Correct Answer:
B
— Output depends only on current inputs
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Q. What is the main difference between CPLD and FPGA?
A.
CPLDs are more complex than FPGAs
B.
FPGAs have more logic resources than CPLDs
C.
CPLDs are used for high-speed applications
D.
FPGAs are less expensive than CPLDs
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Solution
The main difference is that FPGAs typically have more logic resources and are better suited for complex designs compared to CPLDs.
Correct Answer:
B
— FPGAs have more logic resources than CPLDs
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Q. What is the main difference between SR and JK Flip-Flops?
A.
JK Flip-Flop has no invalid state
B.
SR Flip-Flop has a toggle feature
C.
JK Flip-Flop is slower
D.
SR Flip-Flop can only set or reset
Show solution
Solution
The main difference is that the JK Flip-Flop does not have an invalid state when both inputs are high, unlike the SR Flip-Flop.
Correct Answer:
A
— JK Flip-Flop has no invalid state
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