Computer Science for IGCSE & O level - Boolean Logic (Section 4)
1
If the input to a NOT gate is 0, what is the output?
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(B)
1
2
Which type of gate produces an output of 1 when the inputs are different?
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(A)
XOR gate
3
In digital logic, what is the purpose of a 'buffer'?
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B
C
4
What is the purpose of using intermediate values within a truth table, as seen in the provided examples?
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(B)
To break down a complex expression into manageable parts.
5
What is the output of a two-input NOR gate when both inputs are 0?
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(B)
1
6
What does the term 'logic circuit' refer to?
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(B)
A circuit composed of logic gates
7
What type of circuits are logic gates primarily used in?
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(C)
Electronic circuits
8
What is the result of the Boolean expression NOT (1 AND 0)?
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(B)
1
9
What is a primary reason for creating a truth table when designing logic circuits?
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(B)
To visually display the input and output relationships.
10
In the context of logic circuits, what is the purpose of a 'logic expression'?
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(C)
To represent the functionality of a logic circuit using mathematical notation.
11
Which logic gate produces an output that is the inverse of an AND gate?
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(B)
NAND
12
What is the function of the NOT gate?
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(A)
Inverts the input signal
13
Which of the following is a key component in the example of designing a logic circuit for a wood system?
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(B)
Analyzing the real-world parameters.
14
What will be the output of a full-adder if the inputs are: A=1, B=1, and Cin=1?
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(A)
Sum=1, Cout=1
15
What does the symbol NOT represent in the examples?
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(A)
A inverting function
16
What is the output of a NAND gate if input A is 1 and input B is 1?
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(A)
0
17
What is the value of 'A' in Boolean algebra if A = 0?
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(B)
0
18
Which logic gates are combined to make the final logic circuit shown in the example?
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(D)
NOT, AND, and OR
19
What is the output of the logic gate NOT (A) if A=1?
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(A)
0
20
What is the purpose of the truth table?
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(A)
To represent all the possible input and output combinations of a logic circuit.
21
What does the Karnaugh map primarily help with in digital logic?
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(A)
Simplifying Boolean expressions
22
What is the output of a 2-input OR gate when both inputs are 1?
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(B)
1
23
What is the simplest form of the expression A + AB?
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(A)
A
24
If A=0, and B=0, what will be the output of an AND gate?
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(A)
0
25
How are the intermediate logic circuits connected to produce the final output?
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(D)
Dependent on the specific logic expression.
26
If an input A is connected to two NOT gates in series, what is the resulting output signal?
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(A)
A
27
Which of the following statements about the half-adder circuit is correct?
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(D)
All of the above.
28
What is the output of a two-input AND gate if the inputs are 0 and 1?
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(A)
0
29
In a half adder, if A=1 and B=0, what will the Sum be?
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(B)
1
30
How many possible input combinations does a 2-input logic gate have?
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(D)
4
31
Based on the examples, what type of values represent the output of a logic circuit?
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(B)
Only 0 and 1.
32
The output of a NOR gate is HIGH (1) if:
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(D)
None of the inputs are HIGH
33
In the example of the engine management system, what would the output (Y) be if motor speed = 4000rpm, bearing temp = 70C and water velocity = 3 m/s?
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(A)
1
34
What is the purpose of a half adder circuit?
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(C)
To add two single-bit binary numbers.
35
In Boolean algebra, what does the 'plus' symbol (+) represent?
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(B)
OR operation
36
In the manufacturing system for plastic pipes, the system will sound an alarm (X), if the temperature is >= 250 degrees Celsius AND the pressure is at 5 bar. If temperature is 250 and the pressure is at 4, what will be the state of X?
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(B)
0
37
Which gate's output is '1' if at least one input is '1'?
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(B)
OR
38
In Boolean algebra, what logical operation does the plus sign (+) represent?
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(B)
OR
39
What is the output of an OR gate with inputs A=0 and B=1?
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(B)
1
40
Which gate will produce the output 1 if input A=0 and input B=0?
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(A)
NAND gate
41
What is the purpose of logic gates in digital circuits?
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A
C
42
In the wood system example, what do the different 'conditions' refer to?
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(B)
Input parameters or thresholds.
43
What is the role of an AND gate in the examples?
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(A)
It outputs 1 only if all inputs are 1.
44
What is the binary equivalent of decimal number 3?
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(D)
11
45
What is the result of 'A OR A' in Boolean algebra?
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(C)
A
46
What is the function of a truth table in digital logic?
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(C)
To show the relationship between the inputs and the outputs
47
What is the simplified form of A.A in Boolean algebra?
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(A)
A
48
What is the output of a two-input AND gate when the inputs are A=1 and B=1?
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(B)
1
49
How many possible states can a single bit represent?
