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Computer Science for IGCSE & O level - Data Representation (Section 9)

1
What is the hexadecimal equivalent of the binary number 1111?
Answer
(B)
F
2
What does '16-bit audio' mean in terms of digital audio?
Answer
(B)
Each audio sample is represented using 16 bits.
3
What is the principal benefit of data compression?
Answer
(B)
Reduced file size.
4
What is the function of an IP address?
Answer
(C)
To enable communication between devices on a network.
5
Which of the following is a valid hexadecimal digit?
Answer
(B)
9
6
What is the binary representation of the decimal number 10?
Answer
(B)
1010
7
What is a 'byte' typically composed of?
Answer
(B)
8 bits
8
What is a benefit of using Hexadecimal over Binary?
Answer
A
C
9
Why is hexadecimal used in computer science for things like memory addressing?
Answer
(B)
It provides a more readable and compact way to represent binary addresses.
10
Which statement accurately describes the relationship between the sampling rate and the accuracy of the audio signal representation?
Answer
(B)
Higher sampling rate leads to higher accuracy.
11
How can you improve the visual quality of a digital sound recording?
Answer
A
B
12
What is the range of integers that can be represented using 4 bits in two's complement format?
Answer
(C)
-8 to 7
13
What are the common goals of employing data compression techniques?
Answer
A
B
14
Which type of compression is most suitable when it is essential to preserve the original data completely?
Answer
(C)
Lossless
15
What color is typically represented by the HTML color code #0000FF?
Answer
(C)
Blue
16
Which part of a computer's system relies heavily on binary representation to function?
Answer
(C)
Central Processing Unit (CPU)
17
Which of the following are properties of a MAC address?
Answer
A
D
18
Which part of an IPv4 address is represented in hexadecimal notation?
Answer
(D)
IPv4 addresses are not represented in hexadecimal.
19
What is the main purpose of RLE compression?
Answer
(B)
Compressing text strings with repeated characters.
20
Which factors influence the file size of a sound file?
Answer
A
B
C
21
Which type of compression guarantees complete data reconstruction?
Answer
(C)
Lossless
22
What is the typical function of a MAC address?
Answer
(A)
To identify devices on a network
23
What does the term 'bit' stand for?
Answer
(B)
Binary Digit
24
In the context of digital audio, what is 'noise' often caused by?
Answer
A
D
25
What are error codes often used for in software development?
Answer
A
B
26
What is the effect of using a higher sampling rate for sound recording?
Answer
(B)
Higher audio quality and larger file size.
27
What is the base of the binary number system?
Answer
(A)
2
28
What color is represented by the hexadecimal code #008000?
Answer
(C)
Green
29
What are some common applications of hexadecimal notation in computer science?
Answer
A
B
C
30
Which of the following describes the effect of increasing the frame rate of a video?
Answer
(A)
It makes the video appear to move more smoothly.
31
What is the denary (decimal) equivalent of the hexadecimal number 4F?
Answer
(A)
79
32
What is the purpose of sampling in sound recording?
Answer
(B)
To convert analog sound into digital data
33
What is the purpose of the two's complement format?
Answer
A
B
34
Convert the decimal number 75 into hexadecimal.
Answer
(A)
4B
35
Which factor primarily determines the file size of a digital image?
Answer
A
B
36
What does the
Answer
(A)
The red component
37
If you have an 8-bit register, what is the maximum decimal value you can represent?
Answer
(A)
255
38
What is the binary representation of the hexadecimal value "A"?
Answer
(A)
1010
39
What is the denary (decimal) value of the hexadecimal number 1A?
Answer
(B)
26
40
When converting from hexadecimal to decimal, what does each position (place value) represent?
Answer
(D)
Powers of 16
41
What is the result of the hexadecimal addition of A + 5?
Answer
(A)
F
42
What are the characteristics of a lossy compression method?
Answer
(B)
It can result in smaller file sizes.
43
What is the purpose of error codes in programming?
Answer
(B)
To provide information about errors that occur.
44
What is the primary difference between a logical shift and an arithmetic shift?
Answer
(B)
Arithmetic shifts preserve the sign bit, logical shifts do not.
45
What is the relationship between the bit depth used for audio and the potential dynamic range of the audio?
Answer
(C)
Higher bit depth means a greater dynamic range.
46
What is the two's complement of the binary number 1100 (using 4 bits)?
Answer
(B)
0100
47
Which of the following is most commonly used for defining colors in HTML?
Answer
(D)
All of the above
48
What does the hexadecimal color code #00FF00 represent?
Answer
(B)
Green
49
Which file formats typically use lossy compression?
Answer
A
B
50
What impact does increasing the bit depth of a sound recording have?
Answer
A
B
C