Computer Science for IGCSE & O level - Boolean Logic (Section 9)
1
What is the inverse of the OR gate?
Хариулт
(B)
NOR gate
2
A 3-input AND gate has inputs A=1, B=1, and C=0. What is the output?
Хариулт
(A)
0
3
What is the output of a NOR gate when all of its inputs are low?
Хариулт
(B)
1
4
The output of a NOR gate is HIGH (1) only when:
Хариулт
(B)
All inputs are LOW
5
The complement of the logical OR function is the logical ____ function.
Хариулт
(B)
NOR
6
What type of gate inverts the output of an OR gate?
Хариулт
(B)
NOR gate
7
What is the output of a NOT gate if the input is 0?
Хариулт
(B)
1
8
Which gate's output is HIGH (1) when either or both inputs are HIGH (1)?
Хариулт
(B)
OR
9
What type of gate is used to represent NOT A?
Хариулт
(C)
NOT gate
10
Which logic gate produces an output of 1 only when both inputs are 1?
Хариулт
(B)
AND
11
What logical operation does a half adder perform on two inputs?
Хариулт
(C)
Addition
12
In Boolean algebra, the NOT operation is also known as:
Хариулт
(A)
Inversion
13
Which gate produces a HIGH output when only one input is HIGH (1), but NOT both?
Хариулт
(C)
XOR gate
14
What is the logic function performed by a NAND gate?
Хариулт
(A)
AND operation followed by NOT
15
A system uses two inputs: A and B. What happens to the output of an AND gate if A=1, B=0?
Хариулт
(B)
Output is 0
16
Which operation does an OR gate perform?
Хариулт
(C)
Logical OR
17
What will be the output of an XNOR gate if A=1 and B=1?
Хариулт
(B)
1
18
What is the output of a 2-input NOR gate when both inputs are 1?
Хариулт
(A)
0
19
If the inputs to an XOR gate are A=0 and B=0, what is the output?
Хариулт
(A)
0
20
In a half adder, when A=0 and B=1, what is the sum?
Хариулт
(B)
1
21
What is the name of the table that shows the outputs of a logic gate for all possible input combinations?
Хариулт
(B)
A truth table
22
Which logic gate can be used to create the function of a NOT gate?
Хариулт
(D)
None of the above
23
Which of the following gates has a single input?
Хариулт
(C)
NOT gate
24
In Boolean algebra, which operator represents the 'AND' function?
Хариулт
(B)
*
25
Which of the following is NOT a fundamental logic gate?
Хариулт
(D)
XNOR
26
If the inputs of a 2-input AND gate are A=1 and B=1, the output will be?
Хариулт
(B)
1
27
Which of the following statements best describes an XOR gate?
Хариулт
(C)
Outputs HIGH when the inputs are different.
28
How many inputs does a NOT gate have?
Хариулт
(B)
1
29
Which logic gate's output is HIGH only if the inputs are different?
Хариулт
(C)
XOR
30
Which logic gate is known as the 'Inverter'?
Хариулт
(C)
NOT
31
What would be the output of a NOR gate with inputs A=1 and B=0?
Хариулт
(A)
0
32
In a complex logic circuit, what is the role of intermediate outputs?
Хариулт
B
D
33
What is the result when the output of an OR gate is inverted using a NOT gate?
Хариулт
(B)
NOR
34
Which gate produces a HIGH (1) output if both inputs are HIGH?
Хариулт
(C)
AND
35
Which gate is represented by the expression: (A + B)'?
Хариулт
(D)
NOR gate
36
When combining multiple logic gates to produce a more complex circuit, what type of gate is often placed at the end to generate the output of the circuit?
Хариулт
(D)
Any logic gate, depending on the expression.
37
Which of the following is the result of the Boolean expression A AND NOT B?
Хариулт
(C)
0 if A = 1, B = 1
38
What is the output of a 2-input XOR gate when the inputs are A = 0 and B = 1?
Хариулт
(B)
1
39
If the inputs to an OR gate are A=1 and B=1, what is the output?
Хариулт
(B)
1
40
In Boolean algebra, what does the term 'complement' mean?
Хариулт
(B)
The inverse or NOT operation
41
What is the purpose of a NOT gate in a digital circuit?
Хариулт
(B)
To invert the input signal
42
What is the output of an OR gate if the inputs are 0 and 0?
Хариулт
(A)
0
43
Which statement describes a logic circuit with the expression NOT (A OR B)?
Хариулт
(A)
It produces 1 if both A and B are 0, and 0 otherwise.
44
In Boolean algebra, what operator is used to represent the NOT operation?
Хариулт
(C)
!
45
How many half adders are required to create a full adder?
Хариулт
(B)
2
46
Which of the following gates represents the NOT gate?
Хариулт
(C)
The third gate
47
What is the complement of the AND gate?
Хариулт
(B)
NAND
48
What is the main function of the AND gate?
Хариулт
(A)
To output a 1 if all the inputs are 1
49
Which gate’s output is HIGH if and only if BOTH of its inputs are LOW?
Хариулт
(D)
NOR gate
50
What is the output state of a NAND gate if the inputs are A=1 and B=1?
