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. In a full adder, how many inputs does it have?
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Solution
A full adder has three inputs: two significant bits and one carry-in bit.
Correct Answer:
C
— 3
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Q. In a half adder, what does the sum output represent?
A.
Carry out
B.
Logical AND
C.
Logical OR
D.
XOR of inputs
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Solution
The sum output of a half adder represents the XOR of the two input bits.
Correct Answer:
D
— XOR of inputs
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Q. In a monostable 555 timer circuit, what happens when the trigger pin is activated?
A.
The output goes high for a short duration
B.
The output remains low
C.
The output oscillates
D.
The timer resets
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Solution
When the trigger pin is activated, the output of a monostable 555 timer goes high for a short duration.
Correct Answer:
A
— The output goes high for a short duration
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Q. In a monostable 555 timer, what determines the duration of the output pulse?
A.
The supply voltage
B.
The value of the timing resistor and capacitor
C.
The trigger signal duration
D.
The output load
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Solution
The duration of the output pulse in a monostable 555 timer is determined by the values of the timing resistor and capacitor.
Correct Answer:
B
— The value of the timing resistor and capacitor
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Q. In a multiplexer, what is the role of the select lines?
A.
To determine the output based on input values
B.
To store data
C.
To provide power
D.
To control timing
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Solution
Select lines in a multiplexer determine which input line is connected to the output.
Correct Answer:
A
— To determine the output based on input values
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Q. In a ring counter, how many states does it have if it has 4 flip-flops?
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Solution
A ring counter with 4 flip-flops has 4 unique states.
Correct Answer:
A
— 4
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Q. In a serial-in parallel-out shift register, how is data entered?
A.
All at once
B.
One bit at a time
C.
In groups of four
D.
In reverse order
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Solution
Data is entered one bit at a time in a serial-in parallel-out shift register.
Correct Answer:
B
— One bit at a time
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Q. In a shift register, what does the term 'clock pulse' refer to?
A.
The speed of data transfer
B.
The timing signal that controls shifting
C.
The amount of data stored
D.
The type of shift register
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Solution
A clock pulse is a timing signal that controls when the data is shifted in a shift register.
Correct Answer:
B
— The timing signal that controls shifting
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Q. In a T Flip-Flop, what does the T input control?
A.
The output state
B.
The clock frequency
C.
The reset condition
D.
The data input
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Solution
The T input in a T Flip-Flop controls whether the output state toggles or remains the same on each clock pulse.
Correct Answer:
A
— The output state
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Q. In a truth table, how many rows are there for a circuit with 3 inputs?
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Solution
A circuit with 3 inputs has 2^3 = 8 rows in its truth table.
Correct Answer:
C
— 8
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Q. In a truth table, how many rows does a 3-input logic gate have?
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Solution
A 3-input logic gate has 2^3 = 8 rows in its truth table.
Correct Answer:
C
— 8
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Q. In an astable multivibrator, what determines the frequency of oscillation?
A.
The resistor values only
B.
The capacitor value only
C.
Both resistor and capacitor values
D.
The power supply voltage
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Solution
The frequency of oscillation in an astable multivibrator is determined by both the resistor and capacitor values.
Correct Answer:
C
— Both resistor and capacitor values
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Q. In an integrated circuit, what does the term 'die' refer to?
A.
The entire circuit board
B.
The individual chip of silicon
C.
The packaging of the IC
D.
The power supply
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Solution
A 'die' refers to the individual piece of silicon that contains the integrated circuit.
Correct Answer:
B
— The individual chip of silicon
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Q. In an MSI circuit, what is the typical number of gates integrated?
A.
1-10
B.
10-100
C.
100-1000
D.
1000-10000
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Solution
MSI circuits typically integrate between 10 to 100 gates on a single chip.
Correct Answer:
B
— 10-100
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Q. In an SR Flip-Flop, what condition is considered invalid?
A.
S=0, R=0
B.
S=1, R=0
C.
S=0, R=1
D.
S=1, R=1
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Solution
The condition S=1 and R=1 is invalid for an SR Flip-Flop as it leads to an indeterminate state.
Correct Answer:
D
— S=1, R=1
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Q. In an SR flip-flop, what condition leads to an invalid state?
A.
S=0, R=0
B.
S=1, R=0
C.
S=0, R=1
D.
S=1, R=1
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Solution
The condition S=1 and R=1 leads to an invalid state in an SR flip-flop, as it creates an ambiguous output.
Correct Answer:
D
— S=1, R=1
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Q. In astable mode, how many output states does a 555 timer have?
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Solution
In astable mode, the 555 timer continuously oscillates between two output states: high and low.
Correct Answer:
B
— 2
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Q. In digital circuits, what does the term 'logic level' refer to?
A.
Voltage levels
B.
Frequency levels
C.
Temperature levels
D.
Current levels
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Solution
Logic level refers to the voltage levels that represent binary values (0 and 1) in digital circuits.
Correct Answer:
A
— Voltage levels
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Q. In digital circuits, what does the term 'two's complement' refer to?
A.
A method for binary addition
B.
A method for binary subtraction
C.
A way to represent negative numbers
D.
A type of logic gate
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Solution
Two's complement is a method used to represent negative numbers in binary.
Correct Answer:
C
— A way to represent negative numbers
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Q. In digital design, what does FPGA stand for?
A.
Field Programmable Gate Array
B.
Fast Programmable Gate Array
C.
Field Programmable General Array
D.
Fixed Programmable Gate Array
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Solution
FPGA stands for Field Programmable Gate Array, which can be configured by the user after manufacturing.
Correct Answer:
A
— Field Programmable Gate Array
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Q. In digital signal processing, what is aliasing?
A.
Loss of data during transmission
B.
Distortion that occurs when a signal is undersampled
C.
The process of converting digital to analog
D.
A method of noise reduction
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Solution
Aliasing occurs when a signal is undersampled, causing different signals to become indistinguishable from one another in the sampled data.
Correct Answer:
B
— Distortion that occurs when a signal is undersampled
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Q. In HDL, what does the term 'sensitivity list' refer to?
A.
A list of variables to be optimized
B.
A list of signals that trigger an event
C.
A list of modules in a design
D.
A list of test cases
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Solution
The sensitivity list refers to a list of signals that trigger an event in a process block, determining when the process should execute.
Correct Answer:
B
— A list of signals that trigger an event
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Q. In interfacing, what does PWM stand for?
A.
Pulse Width Modulation
B.
Pulse Wave Measurement
C.
Phase Width Modulation
D.
Pulse Wave Modulation
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Solution
PWM stands for Pulse Width Modulation, a technique used to control the power delivered to electrical devices.
Correct Answer:
A
— Pulse Width Modulation
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Q. In MSI circuits, what does the term 'fan-out' refer to?
A.
Number of inputs
B.
Number of outputs a gate can drive
C.
Power consumption
D.
Size of the circuit
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Solution
Fan-out refers to the number of inputs that a single output can drive in a circuit.
Correct Answer:
B
— Number of outputs a gate can drive
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Q. In the context of DSP, what does FFT stand for?
A.
Fast Fourier Transform
B.
Frequency Filter Technique
C.
Fast Filter Transform
D.
Fourier Frequency Transform
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Solution
FFT stands for Fast Fourier Transform, which is an efficient algorithm to compute the Discrete Fourier Transform (DFT).
Correct Answer:
A
— Fast Fourier Transform
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Q. In the context of DSP, what does the term 'windowing' refer to?
A.
The process of filtering a signal
B.
The technique of segmenting a signal for analysis
C.
The conversion of a signal from analog to digital
D.
The adjustment of signal amplitude
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Solution
Windowing refers to the technique of segmenting a signal into smaller parts for analysis, often used in FFT applications.
Correct Answer:
B
— The technique of segmenting a signal for analysis
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Q. In Verilog, which keyword is used to define a module?
A.
define
B.
module
C.
entity
D.
architecture
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Solution
In Verilog, the keyword 'module' is used to define a module, which is a fundamental building block of the design.
Correct Answer:
B
— module
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Q. In Verilog, which operator is used for bitwise AND?
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Solution
The '&' operator is used for bitwise AND operations in Verilog.
Correct Answer:
B
— &
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Q. In VHDL, which keyword is used to define a new entity?
A.
component
B.
entity
C.
architecture
D.
signal
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Solution
The keyword 'entity' is used in VHDL to define a new entity, which represents a hardware component.
Correct Answer:
B
— entity
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Q. In which logic family is the output state determined by the input states without any delay?
A.
TTL
B.
CMOS
C.
Static Logic
D.
Dynamic Logic
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Solution
Static Logic families provide output states that are determined by input states without any delay.
Correct Answer:
C
— Static Logic
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