Computer Science for IGCSE & O level - Data Representation (Section 18)
1
What is the meaning of the term 'sampling rate' in sound recording?
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(A)
The number of times the sound is measured per second.
2
If a binary number is shifted three places to the left, what is the equivalent arithmetic operation performed?
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(B)
Multiplying by 8
3
What is the relationship between the sampling rate and the size of a digital audio file?
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(C)
A higher sampling rate generally results in a larger file size.
4
Which of the following are advantages of file compression?
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A
B
5
What is the equivalent decimal value of the hexadecimal number '1A'?
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(C)
32
6
Which of these is a key characteristic of the hexadecimal number system?
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(C)
Uses sixteen symbols.
7
Which options accurately describe the characteristics of lossless compression?
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A
B
D
8
If the bit depth of an image is increased from 8 bits to 16 bits, what is the effect on the file size?
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(B)
The file size is doubled.
9
Which color does the HTML code #008000 represent?
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(B)
Green
10
What is the maximum value represented by a single hexadecimal digit?
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(C)
15
11
In HTML, what is the purpose of the hexadecimal color code?
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(D)
To represent different colors used in the web page.
12
The image of a black and white image consists of 64 squares. If each square requires 1 byte of storage, and RLE is applied. What would be the storage requirement for a full black image?
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(B)
2 bytes
13
Which of the following are advantages of data compression?
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A
B
C
14
What does the term 'unsigned integer' mean in computer science?
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(B)
An integer that can only represent positive numbers.
15
A bit is the basic unit of all computing memory storage terms and is either 1 or 0. The word comes from binary digit. The byte is the smallest unit of memory in a computer. 1 byte is 8 bits. A bit is sometimes called a nibble - half a byte. What is the relationship between byte and bit?
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(C)
1 byte = 8 bits
16
What does the term 'bit' refer to?
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(B)
A binary digit
17
If a bitmap image has a color depth of 8 bits, how many different colors can each pixel represent?
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(D)
256
18
What does a higher sampling rate result in for digital audio?
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(B)
Higher sound quality and a larger file size.
19
In run-length encoding (RLE), what is the purpose of representing consecutive identical data values?
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(C)
To reduce the file size.
20
What are the 2 ways in the image that allow to find a negative binary representation?
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C
D
21
What is the main function of the ASCII control characters?
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(B)
Manage text formatting and communication
22
What is the purpose of using compression algorithms like JPEG for images?
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(B)
To decrease the file size while maintaining a reasonable image quality.
23
What will happen if the binary number 1111 is shifted one place to the left?
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(A)
Multiplied by 2
24
What are the key principles of run-length encoding (RLE)?
