Computer Science for IGCSE & O level - Data Representation (Section 18)
1
What is the meaning of the term 'sampling rate' in sound recording?
Відповідь
(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?
Відповідь
(B)
Multiplying by 8
3
What is the relationship between the sampling rate and the size of a digital audio file?
Відповідь
(C)
A higher sampling rate generally results in a larger file size.
4
Which of the following are advantages of file compression?
Відповідь
A
B
5
What is the equivalent decimal value of the hexadecimal number '1A'?
Відповідь
(C)
32
6
Which of these is a key characteristic of the hexadecimal number system?
Відповідь
(C)
Uses sixteen symbols.
7
Which options accurately describe the characteristics of lossless compression?
Відповідь
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?
Відповідь
(B)
The file size is doubled.
9
Which color does the HTML code #008000 represent?
Відповідь
(B)
Green
10
What is the maximum value represented by a single hexadecimal digit?
Відповідь
(C)
15
11
In HTML, what is the purpose of the hexadecimal color code?
Відповідь
(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?
Відповідь
(B)
2 bytes
13
Which of the following are advantages of data compression?
Відповідь
A
B
C
14
What does the term 'unsigned integer' mean in computer science?
Відповідь
(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?
Відповідь
(C)
1 byte = 8 bits
16
What does the term 'bit' refer to?
Відповідь
(B)
A binary digit
17
If a bitmap image has a color depth of 8 bits, how many different colors can each pixel represent?
Відповідь
(D)
256
18
What does a higher sampling rate result in for digital audio?
Відповідь
(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?
Відповідь
(C)
To reduce the file size.
20
What are the 2 ways in the image that allow to find a negative binary representation?
Відповідь
C
D
21
What is the main function of the ASCII control characters?
Відповідь
(B)
Manage text formatting and communication
22
What is the purpose of using compression algorithms like JPEG for images?
Відповідь
(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?
Відповідь
(A)
Multiplied by 2
24
What are the key principles of run-length encoding (RLE)?
