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