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Computer Science for IGCSE & O level - Boolean Logic (Section 12)

1
What is the output of a NAND gate if the inputs are A=0 and B=1?
Answer
(B)
1
2
What is the result when the inputs to a NOR gate are 0 and 1?
Answer
(A)
0
3
In a truth table, which row(s) would an AND gate output a '1' for the inputs A and B?
Answer
(D)
A=1, B=1
4
What is the output of a NOR gate if both inputs are 0?
Answer
(B)
1
5
What is the simplified logic expression for NOT(A AND A)?
Answer
(B)
NOT A
6
Which gate will output a '1' when its inputs are NOT the same?
Answer
(C)
XOR
7
How many possible input combinations are there for a logic gate with 3 inputs?
Answer
(C)
8
8
What is the output of an XNOR gate when the inputs are different (0 and 1)?
Answer
(A)
0
9
What type of gate is created by combining an OR gate and a NOT gate?
Answer
(B)
NOR
10
Which of the following is an example of a universal gate?
Answer
(C)
NAND
11
Which logical operation is represented by the symbol '·' (dot) in Boolean algebra?
Answer
(B)
AND
12
What is the output of an AND gate if one of the inputs is 0?
Answer
(A)
0
13
What logical operation is performed by a gate that produces a '1' output when at least one of its inputs is '1'?
Answer
(B)
OR
14
Which gate produces a LOW output when BOTH inputs are HIGH?
Answer
(C)
NAND
15
Which gate has the Boolean expression (A+B)' ?
Answer
(B)
NOR
16
What does the term 'logic level' refer to in the context of digital circuits?
Answer
(B)
The voltage level representing a binary state
17
The output of a NOR gate is HIGH when:
Answer
(B)
All inputs are LOW.
18
How many possible input combinations are there for a logic gate with three inputs?
Answer
(C)
8
19
A logic gate is an electronic circuit that performs a ________ operation on one or more input signals.
Answer
(B)
Logical
20
What is the simplest way to implement the function of a NOT gate?
Answer
(A)
Using a single transistor or an inverter.
21
What does a truth table help to determine?
Answer
(C)
The relationship between inputs and output of a gate
22
A truth table is used to:
Answer
(A)
Show all possible input and output combinations for a digital circuit.
23
What is the output of a 2-input OR gate if the inputs are A=0 and B=0?
Answer
(A)
0
24
What are the outputs of a half adder when the inputs are A=1 and B=0?
Answer
(C)
Sum=1, Carry=0
25
If A=1 and B=0, what would be the output of A NAND B?
Answer
(B)
1
26
If the inputs to an XNOR gate are 1 and 0, what is the output?
Answer
(A)
0
27
What is the inverse of the logical AND operation?
Answer
(C)
NAND
28
What is the binary equivalent of TRUE when using logic gates?
Answer
(B)
1
29
In a full adder, which gate is used to add the inputs?
Answer
(C)
XOR
30
Which of the following gates is considered a universal gate?
Answer
(C)
NOR gate
31
Which gate's output is LOW (0) if *any* of its inputs are HIGH (1)?
Answer
(D)
NOR
32
What is the output of a 2-input NAND gate if the inputs are A=1 and B=0?
Answer
(B)
1
33
Which gate is formed by inverting the output of an OR gate?
Answer
(B)
NOR
34
In a logic circuit, what does a 'high' signal typically represent?
Answer
(B)
1
35
What is the output of a 2-input NOR gate if both inputs are LOW (0)?
Answer
(B)
1
36
The output of an XNOR gate is 1 when inputs are:
Answer
(B)
The same
37
In digital logic, the binary value '1' typically represents:
Answer
(C)
True
38
What is the output of a 2-input AND gate if both inputs are HIGH (logic 1)?
Answer
(B)
HIGH (1)
39
What is the purpose of using logic gates?
Answer
(C)
To switch electrical signals based on logical conditions
40
What is the result when a 0 input is passed through a NOT gate?
Answer
(B)
1
41
What is the output of a 2-input AND gate if input A is 0 and input B is 1?
Answer
(A)
0
42
Which of the following is the correct symbol for a NOT gate?
Answer
(C)
¬
43
What logical operation is performed by a NAND gate?
Answer
(B)
AND followed by NOT
44
Which logic expression is equivalent to a NOR gate?
Answer
(B)
NOT (A OR B)
45
If the inputs to a logic gate are A = 0 and B = 1. What is the output of an AND gate?
Answer
(A)
0
46
In a logic circuit, what would be the behavior of an OR gate with inputs A and B?
Answer
A
B
D
47
If both inputs to an OR gate are 0, what is the output?
Answer
(A)
0
48
What is the simplified expression of (A AND B) OR (A AND NOT B)?
Answer
(A)
A
49
What does the term 'truth table' represent?
Answer
(B)
A table that defines the logical function of a logic gate for all possible input combinations.
50
What is the output of a 2-input NAND gate with inputs A=0 and B=0?
Answer
(B)
1