Digital Electronics MCQs (Part-9)

Which Boolean algebra property states A+A=AA + A = AA+A=A?

A Commutative Law
B Associative Law
C Idempotent Law
D Distributive Law

What is the binary equivalent of the decimal number 25?

A 11101
B 11001
C 10011
D 10101

What is the primary function of ROM in a digital system?

A Store data temporarily
B Store data permanently
C Perform logical operations
D Control clock signals

Which device converts digital signals to analog signals?

A ADC
B DAC
C ROM
D RAM

What is the primary function of a latch in digital electronics?

A Store a single bit of data
B Perform arithmetic operations
C Decode binary data
D Generate clock pulses

Which Boolean expression simplifies A+A′BA + A’BA+A′B?

A BBB
B AAA
C A+BA + BA+B
D A′A’A′

How many cells does a 3-variable Karnaugh map have?

A 4
B 6
C 8
D 16

What is the role of a clock signal in sequential circuits?

A Amplify signals
B Synchronize operations
C Perform arithmetic operations
D Decode binary inputs

What does the term “hold time” refer to in digital circuits?

A Time required for a clock pulse
B Time the input must remain stable after the clock edge
C Time for a signal to propagate through a gate
D Time to store data in memory

Which type of memory loses its content when power is turned off?

A ROM
B Flash Memory
C RAM
D EEPROM

What is the hexadecimal equivalent of binary 10111010?

A BA
B A9
C B9
D AB

What is the output of a NOR gate when all inputs are low?

A 0
B 1
C Undefined
D Depends on inputs

What is the simplified form of AB+A′B+AB′?

A A+BA + BA+B
B BBB
C AAA
D ABABAB

What does the term “propagation delay” refer to?

A Time to stabilize clock signals
B Time for a signal to travel through a logic gate
C Time to store data in memory
D Time to perform addition

Which type of ROM can be erased using ultraviolet light?

A PROM
B EPROM
C EEPROM
D Flash Memory

What is the binary equivalent of decimal 45?

A 101101
B 110011
C 110101
D 101011

What is the main advantage of using a Karnaugh map?

A Faster circuit execution
B Simplifying Boolean expressions
C Generating clock signals
D Storing binary data

Which Boolean algebra property states A⋅(B+C)=AB+AC?

A Commutative Law
B Associative Law
C Distributive Law
D Absorption Law

What is the decimal equivalent of binary 100101?

A 39
B 38
C 37
D 36

What is the primary function of SRAM?

A Store data permanently
B Provide faster access compared to DRAM
C Perform logical operations
D Generate clock pulses