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