WorksheetsDigital Logic Design Quiz
Total questions: 20
Worksheet time: 20mins
Which of the following is NOT a combinational circuit?
Multiplexer
Decoder
Flip-Flop
Full Adder
Sequential circuits differ from combinational circuits in that they have:
Only outputs
Memory elements
Only inputs
No logic gates
Which law states that A + 0 = A?
Idempotent Law
Identity Law
Null Law
Inverse Law
What is the result of A + A'?
0
A
1
A'
According to De Morgan's Theorem: (AB)' =
A' + B'
A + B
A'B'
A' + B
Which logic gate has the output 1 only when all inputs are 0?
AND
OR
NAND
NOR
If the output column of a truth table is all 0s, the Boolean function is:
Constant 1
Constant 0
NOT gate
OR gate
Which logic gate is known as the “Universal Gate”?
AND
OR
NAND
NOT
To build a NOT gate using NAND gates, how many NAND gates are required?
1
2
3
4
Binary addition of 1 + 1 gives:
10
1
11
0
In 2’s complement subtraction, to subtract B from A (A - B), you:
Add A and B
Add A and 2's complement of B
Subtract A from B
Multiply A and B
What is the main function of an ALU?
Store instructions
Perform arithmetic and logic operations
Display data
Control I/O
ALU is a part of which unit in a computer system?
Memory Unit
Control Unit
Central Processing Unit (CPU)
Input Unit
Half adder can add:
Two bits with carry
Two bits without carry
Three bits
Only one bit
A full adder adds:
One input and a carry
Two inputs only
Three inputs: A, B, and Carry-in
Four inputs
What is the carry output of a half adder when A = 1 and B = 1?
0
1
A
B
In a full adder, when A=0, B=1, Cin=1, the sum is:
1
0
2
3
The sum output of a full adder is given by:
A XOR B
A XOR B XOR Cin
A AND B AND Cin
A OR B OR Cin
Which of the following is not a basic logic gate?
AND
XOR
OR
NAND
Which gate's output is the inverse of an AND gate?
OR
NAND
NOR
XOR
