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