Computer Science for IGCSE & O level - Boolean Logic (Section 4)
1
If the input to a NOT gate is 0, what is the output?
Answer
(B)
1
2
Which type of gate produces an output of 1 when the inputs are different?
Answer
(A)
XOR gate
3
In digital logic, what is the purpose of a 'buffer'?
Answer
B
C
4
What is the purpose of using intermediate values within a truth table, as seen in the provided examples?
Answer
(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?
Answer
(B)
1
6
What does the term 'logic circuit' refer to?
Answer
(B)
A circuit composed of logic gates
7
What type of circuits are logic gates primarily used in?
Answer
(C)
Electronic circuits
8
What is the result of the Boolean expression NOT (1 AND 0)?
Answer
(B)
1
9
What is a primary reason for creating a truth table when designing logic circuits?
Answer
(B)
To visually display the input and output relationships.
10
In the context of logic circuits, what is the purpose of a 'logic expression'?
Answer
(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?
Answer
(B)
NAND
12
What is the function of the NOT gate?
Answer
(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?
Answer
(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?
Answer
(A)
Sum=1, Cout=1
15
What does the symbol NOT represent in the examples?
Answer
(A)
A inverting function
16
What is the output of a NAND gate if input A is 1 and input B is 1?
Answer
(A)
0
17
What is the value of 'A' in Boolean algebra if A = 0?
Answer
(B)
0
18
Which logic gates are combined to make the final logic circuit shown in the example?
Answer
(D)
NOT, AND, and OR
19
What is the output of the logic gate NOT (A) if A=1?
Answer
(A)
0
20
What is the purpose of the truth table?
Answer
(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?
Answer
(A)
Simplifying Boolean expressions
22
What is the output of a 2-input OR gate when both inputs are 1?
Answer
(B)
1
23
What is the simplest form of the expression A + AB?
Answer
(A)
A
24
If A=0, and B=0, what will be the output of an AND gate?
Answer
(A)
0
25
How are the intermediate logic circuits connected to produce the final output?
Answer
(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?
Answer
(A)
A
27
Which of the following statements about the half-adder circuit is correct?
Answer
(D)
All of the above.
28
What is the output of a two-input AND gate if the inputs are 0 and 1?
Answer
(A)
0
29
In a half adder, if A=1 and B=0, what will the Sum be?
Answer
(B)
1
30
How many possible input combinations does a 2-input logic gate have?
Answer
(D)
4
31
Based on the examples, what type of values represent the output of a logic circuit?
Answer
(B)
Only 0 and 1.
32
The output of a NOR gate is HIGH (1) if:
Answer
(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?
Answer
(A)
1
34
What is the purpose of a half adder circuit?
Answer
(C)
To add two single-bit binary numbers.
35
In Boolean algebra, what does the 'plus' symbol (+) represent?
Answer
(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?
Answer
(B)
0
37
Which gate's output is '1' if at least one input is '1'?
Answer
(B)
OR
38
In Boolean algebra, what logical operation does the plus sign (+) represent?
Answer
(B)
OR
39
What is the output of an OR gate with inputs A=0 and B=1?
Answer
(B)
1
40
Which gate will produce the output 1 if input A=0 and input B=0?
Answer
(A)
NAND gate
41
What is the purpose of logic gates in digital circuits?
Answer
A
C
42
In the wood system example, what do the different 'conditions' refer to?
Answer
(B)
Input parameters or thresholds.
43
What is the role of an AND gate in the examples?
Answer
(A)
It outputs 1 only if all inputs are 1.
44
What is the binary equivalent of decimal number 3?
Answer
(D)
11
45
What is the result of 'A OR A' in Boolean algebra?
Answer
(C)
A
46
What is the function of a truth table in digital logic?
Answer
(C)
To show the relationship between the inputs and the outputs
47
What is the simplified form of A.A in Boolean algebra?
Answer
(A)
A
48
What is the output of a two-input AND gate when the inputs are A=1 and B=1?
Answer
(B)
1
49
How many possible states can a single bit represent?
