Computer Science for IGCSE & O level - Data Representation (Section 13)

1
If a camera takes a picture with a resolution of 1024x1024 pixels and a color depth of 24 bits, how many bytes of memory would the uncompressed image file require?
إجابة
(C)
3072 KB
2
In Run Length Encoding, what does 'W6B8' represent, assuming 'W' and 'B' are characters?
إجابة
(A)
Six whites and eight blacks in sequence.
3
What is the maximum value representable by a 4-bit unsigned integer?
إجابة
(C)
15
4
In a two's complement system, the most significant bit (MSB) indicates:
إجابة
(B)
The sign of the number.
5
What is the primary goal of representing sound digitally?
إجابة
(B)
To allow computers to process and store sound.
6
How can image resolution be defined in terms of pixels?
إجابة
(A)
The total number of pixels in an image
7
Which compression technique is typically used for images and videos where some loss of data is acceptable?
إجابة
(C)
Lossy compression
8
Which of the following is an example of a lossless compression algorithm?
إجابة
(C)
Run-length encoding (RLE)
9
What is the significance of 64-bit and 32-bit architectures in terms of the number of bits that the CPU can process at once?
إجابة
(B)
64-bit processes 64 bits at once; 32-bit processes 32 bits.
10
What does 'lossy compression' mean?
إجابة
(B)
Some of the data in the original file is discarded to reduce file size.
11
In the context of memory storage, what does the term 'byte' represent?
إجابة
(B)
8 bits
12
What is a significant disadvantage of lossy compression methods?
إجابة
(B)
The original data cannot be fully recovered.
13
What do file compression techniques seek to achieve?
إجابة
A
C
14
In the context of audio, which of the following has the most effect on the file size?
إجابة
(C)
Sampling rate
15
Convert -12 to an 8-bit two's complement binary number.
إجابة
(A)
11110100
16
What effect does shifting a binary number to the left have on its value?
إجابة
(B)
It multiplies the number by 2 for each position shifted.
17
What is the binary value represented by the hexadecimal digit 'C'?
إجابة
(C)
1100
18
How many different combinations can a pixel have if represented by 4 bits?
إجابة
(C)
16
19
In ASCII, what is used to represent numbers, letters, and characters?
إجابة
(A)
Binary codes
20
What term is used to describe the number of times an audio signal is measured per second?
إجابة
(C)
Sampling rate
21
Which of the following compression methods would be BEST for compressing text documents?
إجابة
(D)
Run-length encoding
22
What is the main characteristic used to describe sound waves?
إجابة
(C)
Amplitude
23
In two's complement, what is the range of values that can be represented using 8 bits?
إجابة
(B)
-128 to 127
24
Which color will the HTML code #00FF00 represent?
إجابة
(B)
Green
25
In the context of HTML, what do the hexadecimal values represent?
إجابة
(C)
Color
26
What is the hexadecimal representation of the binary number 1010?
إجابة
(A)
A
27
How is the sign of a number indicated in two's complement representation?
إجابة
(D)
By the sign bit (most significant bit).
28
What is the binary equivalent of the hexadecimal number 2A?
إجابة
(B)
10101010
29
What is the decimal equivalent of the hexadecimal number 'A'?
إجابة
(B)
10
30
If an image's resolution is increased, while keeping its color depth constant, what is the effect on the file size?
إجابة
(C)
The file size will increase.
31
What does the frequency of a sound wave determine?
إجابة
(B)
The pitch of the sound
32
In an 8-bit register, what is the range of numbers that can be represented using the two's complement format?
إجابة
(B)
-128 to 127
33
When would you use a lossy compression method?
إجابة
A
B
34
If you shift the binary number 11000010 two places to the left, what is the result?
إجابة
(D)
11001000
35
Which of the following is NOT a characteristic of sound waves?
إجابة
(D)
Color
36
Which statement best describes the relationship between sample rate and audio quality?
إجابة
(C)
A higher sample rate potentially results in a higher quality.
37
What is the decimal equivalent of the binary number 1101?
إجابة
(C)
13
38
In the context of data storage, what is the meaning of 'bit depth'?
إجابة
(A)
The number of bits per pixel.
39
Which of the following statements regarding lossless compression is correct?
إجابة
(C)
Lossless compression can restore the original data completely.
40
What is the result of adding the two binary numbers: 1101 + 0110 ?
إجابة
(B)
10010
41
What is the binary equivalent of the decimal number 7?
إجابة
(C)
111
42
In two's complement, to represent the negative of a number, you do the following.
إجابة
(B)
Invert the bits and add one.
43
Which statement correctly describes the relationship between a binary number and its equivalent decimal value?
إجابة
(B)
Each bit position in a binary number represents a power of 2.
44
What is the function of a MAC address?
إجابة
(B)
To uniquely identify devices on a network
45
What is the largest integer that can be represented with 16 bits?
إجابة
(B)
65535
46
If you are compressing a text file using RLE and encounter the string "AAAAABBBCC", how would the string likely be represented after compression?
إجابة
(D)
A5B3C2
47
What does the term 'amplitude' represent in a sound wave?
إجابة
(B)
The loudness of the sound.
48
Which compression technique results in the most significant file size reduction?
إجابة
(C)
Lossy compression
49
If a sound recording has a higher sampling rate, what is its most likely effect on file size and quality?
إجابة
(D)
Larger file size, higher quality.
50
How are the remainders used when converting a decimal number into a binary number?
إجابة
(B)
They are used to create the binary number by reading them in reverse order.