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Computer Science for IGCSE & O level - Boolean Logic (Section 8)

1
Which of the following statements is correct regarding the behavior of a NOR gate?
Answer
A
B
C
2
Which Boolean expression is true for an OR gate with inputs A and B?
Answer
(B)
Output = A OR B
3
Which Boolean operation directly translates to a NOT gate?
Answer
(C)
Complementation
4
What is the result of 1 + 1 in binary addition?
Answer
(C)
10
5
What is the output of an OR gate if the inputs are 0 and 0?
Answer
(A)
0
6
A logic circuit outputs a 1 only when all inputs are the same. What kind of gate does this behavior represent?
Answer
(B)
XNOR
7
What are the two possible output values in a digital logic system?
Answer
(A)
0 and 1
8
What is the output of an OR gate if the inputs are A=0 and B=1?
Answer
(B)
1
9
In Boolean algebra, the AND operation is represented using which symbol?
Answer
(B)
*
10
In logic gates, how many input values can a single input line carry?
Answer
(B)
1
11
A truth table has two inputs, A and B. Which of the following is true for a NAND gate?
Answer
(A)
Output is 1 if either A or B is 0, and 0 only if both are 1.
12
Which gate gives an output of 1 only when one input is 1 and the other is 0?
Answer
(C)
XOR gate
13
If an AND gate has inputs A=0 and B=1, what is the output?
Answer
(A)
0
14
What is the output of a NAND gate when both inputs are 0?
Answer
(B)
1
15
Which logic gate is represented by the expression (A + B)'?
Answer
(D)
NOR
16
What gate is functionally equivalent to a NOT gate followed by an AND gate?
Answer
(A)
NAND
17
What is the main purpose of a truth table?
Answer
(D)
To represent all possible input/output combinations for a logic gate.
18
What is the output of a 2-input XOR gate if the inputs are both 1?
Answer
(A)
0
19
The inputs to a logic gate are A and B. How is the output of an AND gate expressed?
Answer
(B)
A·B
20
What is the output of an OR gate if one input is 1 and the other is 0?
Answer
(B)
1
21
What is the output when the input to a NOT gate is HIGH (1)?
Answer
(A)
0
22
What is the output of a 2-input NOR gate when both inputs are 0?
Answer
(B)
1
23
Which logic gate is equivalent to an OR gate followed by a NOT gate?
Answer
(C)
NOR gate
24
In a half adder circuit, what are the two outputs generated?
Answer
(B)
Sum and Carry
25
What type of gate can be used to create an 'exclusive-OR' (XOR) function?
Answer
(C)
A combination of AND, OR, and NOT gates
26
If the input to a NOT gate is 1, what is the output?
Answer
(A)
0
27
What is the effect of cascading NOT gates?
Answer
(B)
Inversion
28
What logic gate produces an output of 1 when the inputs are NOT equal?
Answer
(C)
XOR
29
What is the function performed by the OR gate?
Answer
(B)
Output 1 if any input is 1
30
Which logical operation is performed by an AND gate?
Answer
(C)
Logical multiplication
31
What type of gate is created by inverting the output of an AND gate?
Answer
(B)
NAND
32
Which of the following logic gates produces an output that is the inverse of an OR gate?
Answer
(C)
NOR
33
In a binary system, how is the state 'FALSE' typically represented?
Answer
(A)
0
34
If the inputs to a NOR gate are both 0, what is the output?
Answer
(B)
1
35
What is the function of an XOR gate?
Answer
(C)
Outputs HIGH if inputs are different.
36
Which operation does the NOT gate perform?
Answer
(C)
Inversion
37
What is the simplified expression for (A + B)'?
Answer
(B)
A' * B'
38
What is the result of the NOT operation applied to a 0?
Answer
(B)
1
39
Which gate produces a low output when all inputs are high?
Answer
(C)
NAND
40
What is the effect of a NOT gate on an input signal?
Answer
(B)
It inverts the input signal.
41
Which gate produces a HIGH output if at least one input is HIGH?
Answer
(B)
OR
42
What is the output of an XNOR gate with inputs A=0 and B=0?
Answer
(B)
1
43
What is the purpose of a truth table?
Answer
(B)
To show the output for all input combinations
44
Which gate is the inverse of an AND gate?
Answer
(B)
NAND gate
45
How can one obtain a NOT gate using a NAND gate?
Answer
(A)
Connect both inputs of the NAND gate together.
46
Which of the following logic gates will produce a high output if the two inputs are different?
Answer
(C)
XOR gate
47
What is the function of the NOT gate in terms of Boolean algebra?
Answer
(C)
Inversion
48
In the context of building logic circuits, what is a 'logic gate'?
Answer
(B)
A basic building block that performs a specific logical operation
49
Which gate produces a 1 output ONLY when ALL inputs are 1?
Answer
(C)
AND
50
In the design of a logic circuit, what do truth tables primarily assist with?
Answer
(C)
Verifying the circuit's functionality.