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