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 happens to the bits in a shift register when a shift operation is performed?
A.
They are deleted
B.
They are copied
C.
They are shifted to the next position
D.
They are reversed
Show solution
Solution
During a shift operation, the bits in a shift register are shifted to the next position, either left or right.
Correct Answer:
C
— They are shifted to the next position
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Q. What happens to the data in a shift register when it is reset?
A.
Data is preserved
B.
Data is shifted out
C.
Data is cleared
D.
Data is inverted
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Solution
When a shift register is reset, the data is cleared.
Correct Answer:
C
— Data is cleared
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Q. What happens when the trigger pin of a 555 timer is pulled low in monostable mode?
A.
The output goes high
B.
The output goes low
C.
The timer resets
D.
Nothing happens
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Solution
Pulling the trigger pin low causes the output to go high for the duration set by the timing components.
Correct Answer:
A
— The output goes high
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Q. What is a characteristic of a serial-in, serial-out (SISO) shift register?
A.
Data is input and output in parallel
B.
Data is input serially and output serially
C.
Data is input in parallel and output serially
D.
Data is stored permanently
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Solution
A SISO shift register allows data to be input serially and output serially.
Correct Answer:
B
— Data is input serially and output serially
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Q. What is a common application of MSI circuits?
A.
Microprocessors
B.
Basic resistors
C.
Capacitors
D.
Inductors
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Solution
MSI circuits are commonly used in microprocessors, where multiple logic functions are required.
Correct Answer:
A
— Microprocessors
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Q. What is a decade counter?
A.
A counter that counts from 0 to 9
B.
A counter that counts from 0 to 15
C.
A counter that counts in binary
D.
A counter that counts in hexadecimal
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Solution
A decade counter counts from 0 to 9, which is a total of 10 states.
Correct Answer:
A
— A counter that counts from 0 to 9
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Q. What is a disadvantage of TTL logic families?
A.
High power consumption
B.
Low noise immunity
C.
High cost
D.
Low speed
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Solution
TTL logic families generally have higher power consumption compared to CMOS, making them less suitable for low-power applications.
Correct Answer:
A
— High power consumption
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Q. What is a disadvantage of using CMOS logic?
A.
High power consumption
B.
Slow switching speed
C.
Susceptibility to noise
D.
Complex fabrication process
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Solution
CMOS technology can be complex to fabricate due to the need for both n-type and p-type transistors.
Correct Answer:
D
— Complex fabrication process
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Q. What is a finite state machine (FSM) in digital design?
A.
A type of memory
B.
A model of computation representing states and transitions
C.
A method for data storage
D.
A programming language
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Solution
A finite state machine (FSM) is a model of computation that represents states and transitions based on input conditions.
Correct Answer:
B
— A model of computation representing states and transitions
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Q. What is a Programmable Logic Device (PLD)?
A.
A device that can be programmed to perform specific logic functions
B.
A fixed-function logic device
C.
A type of microcontroller
D.
A memory storage device
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Solution
A PLD is a device that can be programmed to perform specific logic functions, allowing for custom logic designs.
Correct Answer:
A
— A device that can be programmed to perform specific logic functions
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Q. What is a testbench in HDL design?
A.
A tool for synthesizing hardware
B.
A simulation environment for testing designs
C.
A method for debugging code
D.
A type of HDL syntax
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Solution
A testbench is a simulation environment used to test and verify the functionality of HDL designs.
Correct Answer:
B
— A simulation environment for testing designs
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Q. What is aliasing in digital signal processing?
A.
Loss of data during transmission
B.
Distortion caused by insufficient sampling rate
C.
Error in quantization
D.
Interference from other signals
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Solution
Aliasing occurs when a signal is sampled at a rate lower than twice its highest frequency, causing different signals to become indistinguishable.
Correct Answer:
B
— Distortion caused by insufficient sampling rate
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Q. What is pipelining in microprocessor design?
A.
A method to increase memory capacity
B.
A technique to execute multiple instructions simultaneously
C.
A way to reduce power consumption
D.
A process for cooling the CPU
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Solution
Pipelining is a technique used in microprocessor design to execute multiple instructions simultaneously by overlapping the execution stages.
Correct Answer:
B
— A technique to execute multiple instructions simultaneously
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Q. What is pipelining in microprocessors?
A.
A method to increase memory capacity
B.
A technique to improve instruction throughput
C.
A way to reduce power consumption
D.
A process for data encryption
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Solution
Pipelining is a technique used in microprocessors to improve instruction throughput by overlapping the execution of multiple instructions.
Correct Answer:
B
— A technique to improve instruction throughput
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Q. What is quantization in the context of digital signal processing?
A.
The process of sampling a signal
B.
The process of converting a continuous signal into a discrete signal
C.
The process of rounding off values to a finite set of levels
D.
The process of filtering a signal
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Solution
Quantization is the process of mapping a continuous range of values into a finite range of discrete values.
Correct Answer:
C
— The process of rounding off values to a finite set of levels
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Q. What is the base of the hexadecimal number system?
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Solution
The base of the hexadecimal number system is 16.
Correct Answer:
D
— 16
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Q. What is the binary equivalent of the decimal number 10?
A.
1010
B.
1001
C.
1100
D.
1110
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Solution
The binary equivalent of the decimal number 10 is 1010.
Correct Answer:
A
— 1010
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Q. What is the binary representation of the decimal number 10?
A.
1010
B.
1001
C.
1100
D.
1110
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Solution
The binary representation of 10 is 1010.
Correct Answer:
A
— 1010
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Q. What is the binary representation of the decimal number 13?
A.
1101
B.
1011
C.
1110
D.
1001
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Solution
The decimal number 13 is represented as 1101 in binary.
Correct Answer:
A
— 1101
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Q. What is the characteristic table of a JK Flip-Flop when both J and K inputs are high?
A.
No change
B.
Set
C.
Reset
D.
Toggle
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Solution
When both J and K inputs are high, the JK Flip-Flop toggles its output state.
Correct Answer:
D
— Toggle
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Q. What is the decimal equivalent of the binary number 11101?
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Solution
The binary number 11101 is equivalent to 29 in decimal.
Correct Answer:
A
— 29
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Q. What is the decimal equivalent of the binary number 1111?
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Solution
1111 in binary equals 1*2^3 + 1*2^2 + 1*2^1 + 1*2^0 = 15.
Correct Answer:
A
— 15
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Q. What is the decimal equivalent of the binary number 111?
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Solution
The binary number 111 is equal to 7 in decimal.
Correct Answer:
C
— 7
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Q. What is the decimal equivalent of the hexadecimal number A3?
A.
163
B.
160
C.
165
D.
168
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Solution
A3 in hexadecimal is equal to 163 in decimal.
Correct Answer:
A
— 163
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Q. What is the decimal equivalent of the octal number 17?
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Solution
17 in octal equals 1*8^1 + 7*8^0 = 15.
Correct Answer:
A
— 15
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Q. What is the difference between a momentary switch and a latching switch?
A.
Momentary switches stay on until released, latching switches do not
B.
Latching switches stay on until released, momentary switches do not
C.
Both are the same
D.
Momentary switches are used for high power, latching switches are not
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Solution
A latching switch remains in its last position until manually changed, while a momentary switch only stays on while pressed.
Correct Answer:
B
— Latching switches stay on until released, momentary switches do not
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Q. What is the duty cycle of a 555 timer configured in astable mode?
A.
50%
B.
33%
C.
25%
D.
Depends on resistor values
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Solution
The duty cycle in astable mode depends on the resistor and capacitor values used in the circuit.
Correct Answer:
D
— Depends on resistor values
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Q. What is the effect of a 'shift left' operation on a binary number?
A.
It multiplies the number by 2
B.
It divides the number by 2
C.
It adds a zero to the end
D.
It reverses the number
Show solution
Solution
A 'shift left' operation on a binary number effectively multiplies the number by 2.
Correct Answer:
A
— It multiplies the number by 2
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Q. What is the effect of a left shift operation on a binary number?
A.
It multiplies the number by 2
B.
It divides the number by 2
C.
It adds 1 to the number
D.
It subtracts 1 from the number
Show solution
Solution
A left shift operation on a binary number effectively multiplies the number by 2.
Correct Answer:
A
— It multiplies the number by 2
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Q. What is the effect of increasing the resistance in the timing circuit of an astable 555 timer?
A.
Increases the frequency
B.
Decreases the frequency
C.
No effect on frequency
D.
Increases the duty cycle
Show solution
Solution
Increasing the resistance in the timing circuit of an astable 555 timer decreases the frequency of the output waveform.
Correct Answer:
B
— Decreases the frequency
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