Digital Logic Design MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What is a ‘Johnson counter’?
A. A type of counter that generates a specific sequence of binary numbers
B. A device for converting analog to digital signals
C. A circuit that amplifies signals
D. A storage device for binary data
Answer: A type of counter that generates a specific sequence of binary numbers
What is a ‘full adder’ used for?
A. To add three binary numbers together and output a sum and carry
B. To perform subtraction of binary numbers
C. To amplify binary signals
D. To encode binary information
Answer: To add three binary numbers together and output a sum and carry
What does a ‘4-bit shift register’ do?
A. Shifts data in binary form to the left or right
B. Stores a single bit of data
C. Converts analog signals to digital
D. Performs arithmetic operations
Answer: Shifts data in binary form to the left or right
What is an ‘XOR gate’ used for?
A. To output true only when the number of true inputs is odd
B. To output true when both inputs are the same
C. To invert the input signal
D. To output true only when all inputs are true
Answer: To output true only when the number of true inputs is odd
What is the function of a ‘decoder’ in digital circuits?
A. To convert binary information to a decimal output
B. To encode data into binary
C. To perform logical operations
D. To amplify signals
Answer: To convert binary information to a decimal output
What is the output of a NOR gate when all inputs are true?
A. False
B. True
C. Undefined
D. Zero
Answer: False
What does a ‘NAND gate’ do?
A. Outputs false only when all inputs are true
B. Outputs true only when all inputs are true
C. Outputs false if any input is true
D. Outputs true if any input is false
Answer: Outputs false only when all inputs are true
What is the difference between a ‘multiplexer’ and a ‘demultiplexer’?
A. A multiplexer selects one of many inputs to pass to a single output, while a demultiplexer distributes a single input to multiple outputs
B. A multiplexer amplifies signals, while a demultiplexer filters them
C. A multiplexer converts analog signals, while a demultiplexer converts digital signals
D. A multiplexer stores data, while a demultiplexer performs calculations
Answer: A multiplexer selects one of many inputs to pass to a single output, while a demultiplexer distributes a single input to multiple outputs
What is a ‘priority encoder’ used for?
A. To encode multiple input lines to fewer output lines with priority
B. To decode binary information
C. To perform arithmetic operations
D. To store data
Answer: To encode multiple input lines to fewer output lines with priority