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Computer Science for IGCSE & O level - Data Representation (Section 10)

1
What is the decimal equivalent of the binary number 110101?
Answer
(A)
53
2
What is the role of a Digital-to-Analog Converter (DAC) in audio systems?
Answer
(A)
To convert digital audio signals to analog audio signals.
3
Which of the following is the most common way to represent the color blue in an HTML code?
Answer
(C)
#0000FF
4
What is the binary equivalent of the hexadecimal number 'C'?
Answer
(B)
1100
5
What is the main purpose of data compression?
Answer
(B)
To reduce file size.
6
What is the effect of a higher color depth on an image?
Answer
(C)
More colors and detail.
7
What is the key objective of data compression?
Answer
(B)
To reduce file size.
8
Which of the following statements accurately describes the use of hexadecimal numbers in relation to binary?
Answer
(B)
Hexadecimal is a more compact way of representing binary values.
9
What is the binary representation of the hexadecimal number 'C'?
Answer
(A)
1100
10
What are the general goals of data compression?
Answer
A
B
11
What is the binary equivalent of the decimal number 50?
Answer
(A)
110010
12
What is a key characteristic of lossy compression?
Answer
(B)
It typically results in smaller file sizes.
13
What is the advantage of using hexadecimal over binary for representing numbers?
Answer
A
B
14
If a hexadecimal number has the value "A", what is its decimal equivalent?
Answer
(B)
10
15
What is the decimal equivalent of the binary number 11011?
Answer
(C)
27
16
Which of the following is NOT a disadvantage of the ASCII character set?
Answer
(C)
It is not supported by modern computers.
17
What is the binary equivalent of the decimal number 20?
Answer
(A)
10100
18
What is the benefit of using hexadecimal in the context of memory addresses?
Answer
A
B
19
In an 8-bit two's complement system, what is the value of the binary number 10000000?
Answer
(B)
-128
20
In Run-Length Encoding (RLE), what does a 'flag' represent?
Answer
(D)
An indicator that a sequence is encoded
21
In the context of image resolution, what does a higher resolution generally mean?
Answer
(C)
The image has more detail and clarity.
22
Which of the following statements accurately describes the relationship between frequency and the pitch of sound?
Answer
(D)
Higher frequency corresponds to a higher pitch.
23
Which process is used to convert an analog sound wave into a digital representation?
Answer
(C)
Sampling
24
In computer science, what is a common use of hexadecimal color codes?
Answer
(B)
Defining the red, green, and blue color values of a pixel
25
What is a key reason for using hexadecimal in low-level programming or hardware control?
Answer
(B)
Because it simplifies the representation of a group of binary bits.
26
What happens to the file size of an image if both the image resolution and colour depth are increased?
Answer
(C)
The file size will increase.
27
What is the purpose of two's complement in representing integers?
Answer
(B)
To allow subtraction using addition.
28
What is generally sacrificed in lossy compression to achieve smaller file sizes?
Answer
(A)
The original data quality.
29
In a binary number represented in two's complement, what does the most significant bit (MSB) indicate?
Answer
(B)
The sign of the number
30
Which of the following is a key advantage of lossless compression?
Answer
(B)
Exact replication of the original data.
31
What is the primary purpose of a MAC address?
Answer
(A)
To uniquely identify a network interface.
32
What does the hexadecimal value 'FF' represent in terms of color in a typical computer system?
Answer
(B)
White
33
What is the two's complement of the binary number 1111?
Answer
(A)
0001
34
What is the primary purpose of compression algorithms in digital media?
Answer
(B)
To reduce the file size.
35
What are the two main stages involved in representing sound digitally?
Answer
(B)
Sampling and quantization.
36
What are some examples of lossy compression?
Answer
A
C
37
In the context of computer science, what does the term 'binary' refer to?
Answer
(B)
A system representing data using only two digits (0 and 1).
38
What aspect of sound is measured in Hertz (Hz)?
Answer
(B)
Frequency
39
Which of the following factors contribute to the size of a digital video file?
Answer
A
B
C
D
40
Which type of image is made up of pixels arranged in a grid?
Answer
(B)
Bitmap Image
41
In the context of an 8-bit register, what does '11111111' represent if it's interpreted as an unsigned integer?
Answer
(B)
255
42
What is the purpose of logical binary shifts?
Answer
(D)
All of the above
43
Which of the following terms is related to the number of pixels per unit area in an image?
Answer
(B)
Resolution
44
How many bytes are used to represent one character in ASCII?
Answer
(A)
1
45
What is the purpose of a MAC address?
Answer
(B)
To identify a network interface card.
46
What happens when you perform a left logical shift on the binary number 00001010?
Answer
(A)
00010100
47
Which of the following are benefits of using hexadecimal?
Answer
A
B
D
48
What is the relationship between image resolution and file size?
Answer
(C)
As resolution increases, file size increases.
49
Which number system provides the foundation for digital computer operations?
Answer
(B)
Binary
50
Which of these is *not* a valid hexadecimal digit?
Answer
(C)
G