Digital Electronics MCQs

What is the base of a binary number system? a) 2 b) 8 c) 10 d) 16 Answer: a) 2 Which of the following is a universal gate? a) AND gate b) OR gate c) NOT gate d) NAND gate Answer: d) NAND gate What is the binary equivalent of the decimal number 10? a) 1010 b) 1001 c) 1100 d) 1111 Answer: a) 1010 How many bits are in a byte? a) 4 b) 8 c) 16 d) 32 Answer: b) 8 Which of the following flip-flops is used as a basic memory element? a) D flip-flop b) JK flip-flop c) T flip-flop d) SR flip-flop Answer: d) SR flip-flop What is the hexadecimal representation of the binary number 1110? a) A b) B c) C d) E Answer: d) E Which of the following is a sequential circuit? a) Multiplexer b) Demultiplexer c) Counter d) Comparator Answer: c) Counter What is the function of a multiplexer? a) Converts one form of data to another b) Routes data from multiple sources to a single destination c) Stores data d) Generates clock pulses Answer: b) Routes data from multiple sources to a single destination What is the main advantage of CMOS over TTL? a) Higher speed b) Lower power consumption c) Higher noise immunity d) Lower cost Answer: b) Lower power consumption What is the typical propagation delay of a standard TTL gate? a) 1 ns b) 10 ns c) 100 ns d) 1 µs Answer: b) 10 ns Which gate produces a HIGH output only when all inputs are LOW? a) AND b) OR c) NAND d) NOR Answer: d) NOR In a 4-bit binary number, what is the maximum decimal value it can represent? a) 7 b) 8 c) 15 d) 16 Answer: c) 15 Which of the following is a combinational logic circuit? a) Flip-flop b) Register c) Encoder d) Counter Answer: c) Encoder What does ASCII stand for? a) American Standard Code for Information Interchange b) Automated System for Computer Information c) Advanced Software Communication Interface d) American System for Computing Information Answer: a) American Standard Code for Information Interchange How many select lines are needed for an 8-to-1 multiplexer? a) 2 b) 3 c) 4 d) 8 Answer: b) 3 What is the output of an XOR gate when both inputs are 1? a) 0 b) 1 c) Depends on the other inputs d) High impedance Answer: a) 0 Which of the following is a non-volatile memory? a) SRAM b) DRAM c) ROM d) Cache Answer: c) ROM Which digital component is used to store data temporarily? a) Register b) Decoder c) Multiplexer d) Comparator Answer: a) Register What is the primary function of an ALU? a) Arithmetic and logic operations b) Data storage c) Input and output operations d) Power regulation Answer: a) Arithmetic and logic operations How many unique states does a 3-bit counter have? a) 4 b) 6 c) 8 d) 16 Answer: c) 8 What is the main advantage of synchronous circuits over asynchronous circuits? a) Simplicity b) Speed c) Reliability d) Cost Answer: c) Reliability What is the binary representation of the hexadecimal number A? a) 1010 b) 1011 c) 1100 d) 1110 Answer: a) 1010 Which of the following is a volatile memory? a) ROM b) Flash memory c) SRAM d) EPROM Answer: c) SRAM What does a flip-flop store? a) Multiple bits b) Single bit c) Byte d) Nibble Answer: b) Single bit What is the function of a decoder? a) Encodes data b) Multiplies data c) Converts encoded data to its original form d) None of the above Answer: c) Converts encoded data to its original form Which of the following is an example of a sequential logic circuit? a) AND gate b) OR gate c) Flip-flop d) Multiplexer Answer: c) Flip-flop What is the hexadecimal equivalent of the binary number 1101? a) A b) B c) C d) D Answer: d) D Which type of memory is used to speed up the processing in a computer? a) RAM b) ROM c) Cache d) Hard Disk Answer: c) Cache Which of the following logic gates is known as an inverter? a) AND gate b) OR gate c) NOT gate d) XOR gate Answer: c) NOT gate What is the maximum value of a 4-bit binary number in decimal? a) 8 b) 10 c) 15 d) 16 Answer: c) 15 What is the purpose of a demultiplexer? a) To combine data from multiple sources into a single source b) To convert one form of data to another c) To route data from a single source to multiple destinations d) To store data Answer: c) To route data from a single source to multiple destinations Which of the following is an advantage of CMOS over TTL? a) Faster speed b) Lower cost c) Lower power consumption d) Greater output current Answer: c) Lower power consumption What is the output of a NAND gate when both inputs are 1? a) 0 b) 1 c) Depends on the other inputs d) High impedance Answer: a) 0 Which of the following memories is used to store the BIOS in a computer? a) RAM b) ROM c) SRAM d) DRAM Answer: b) ROM Which digital component is used to add two binary numbers? a) Decoder b) Multiplexer c) Adder d) Comparator Answer: c) Adder What does an ALU stand for? a) Arithmetic Logic Unit b) Analog Logic Unit c) Advanced Logic Unit d) Arithmetic Linear Unit Answer: a) Arithmetic Logic Unit How many flip-flops are required to make a 4-bit binary counter? a) 2 b) 3 c) 4 d) 5 Answer: c) 4 Which of the following is an asynchronous communication method? a) Synchronous communication b) Asynchronous communication c) Serial communication d) Parallel communication Answer: b) Asynchronous communication What is the binary equivalent of the hexadecimal number F? a) 1010 b) 1011 c) 1100 d) 1111 Answer: d) 1111 Which of the following is an example of non-volatile memory? a) SRAM b) DRAM c) Flash memory d) Cache Answer: c) Flash memory Which component is used to store a single bit of data in digital electronics? a) Multiplexer b) Register c) Flip-flop d) Counter Answer: c) Flip-flop What is the purpose of a register in digital electronics? a) To perform arithmetic operations b) To store data temporarily c) To encode data d) To route data Answer: b) To store data temporarily What is the main purpose of an encoder? a) To decode data b) To store data c) To convert data into a coded form d) To perform arithmetic operations Answer: c) To convert data into a coded form Which of the following is an example of a combinational logic circuit? a) Counter b) Flip-flop c) Decoder d) Register Answer: c) Decoder What is the hexadecimal equivalent of the binary number 1011? a) A b) B c) C d) D Answer: b) B Which type of memory is typically used for cache memory? a) DRAM b) ROM c) SRAM d) Flash memory Answer: c) SRAM What is the function of an AND gate? a) Produces a HIGH output if any input is HIGH b) Produces a LOW output if any input is LOW c) Produces a HIGH output only if all inputs are HIGH d) Produces a LOW output only if all inputs are LOW Answer: c) Produces a HIGH output only if all inputs are HIGH Which of the following is an advantage of TTL over CMOS? a) Higher speed b) Lower power consumption c) Greater noise immunity d) Lower cost Answer: a) Higher speed Which gate produces a HIGH output when all inputs are LOW? a) AND b) OR c) NAND d) NOR Answer: d) NOR What is the primary function of a counter in digital electronics? a) To count pulses b) To store data c) To encode data d) To decode data Answer: a) To count pulses

Digital Electronics MCQs

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