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