Sign In

Computer Science for IGCSE & O level - Data Representation (Section 6)

1
What is the relationship between frequency and wavelength in sound waves?
Answer
(C)
They are inversely proportional.
2
Which of the following is NOT a purpose of the hexadecimal system in computer science?
Answer
(D)
Performing arithmetic calculations directly
3
What are the advantages of using a higher sampling rate when digitizing sound?
Answer
B
C
4
What is the result of the hexadecimal addition: A + 2?
Answer
(A)
C
5
What is the decimal equivalent of the binary number 1101 (assuming a 4-bit unsigned binary representation)?
Answer
(D)
13
6
Which are the primary factors that determine image file size?
Answer
A
B
C
7
Which compression methods are usually suitable for text files?
Answer
B
C
8
Which kind of compression generally results in the smallest file size?
Answer
(C)
Lossy
9
What is the purpose of the Extended ASCII character set?
Answer
(A)
To add more characters to the original ASCII set.
10
What is the range of possible decimal values that can be represented by an 8-bit unsigned integer?
Answer
(B)
0 to 255
11
In data representation, what does the term 'color depth' mean?
Answer
(B)
The number of colors that can be displayed in an image.
12
In binary addition, when does a carry occur?
Answer
(D)
When adding 1 + 1
13
How many hexadecimal digits are needed to represent a single byte (8 bits)?
Answer
(B)
2
14
Which file format is most commonly associated with the use of lossy compression for images?
Answer
(D)
JPEG
15
What does the 'sample rate' refer to in audio recording?
Answer
(B)
The number of samples taken per second.
16
Which of the following is true about logical bit shifts?
Answer
B
D
17
What happens to the quality of an image when lossy compression is used?
Answer
(C)
There might be a reduction in image details.
18
What happens when you divide a decimal number by 2 repeatedly during a decimal-to-binary conversion?
Answer
(A)
You obtain the binary digits in reverse order as the remainders.
19
How does a computer's CPU interpret a sequence of binary digits?
Answer
(B)
As instructions or data, depending on the context.
20
What is the purpose of a bit in computer science?
Answer
(B)
To store a single binary digit.
21
Which of the following are commonly used for lossless compression?
Answer
A
C
22
How many bits are typically contained within one byte?
Answer
(B)
8
23
What does '24-bit color' refer to in an image?
Answer
(C)
Each pixel is represented by 24 bits, allowing a wide range of colors.
24
What is the relationship between image resolution and file size?
Answer
(C)
Higher resolution generally leads to a larger file size.
25
What is the binary equivalent of the decimal number 35?
Answer
(A)
100011
26
What does the acronym BMP stand for in the context of image files?
Answer
(A)
Bit Map Picture
27
How many different values can be represented with two bits?
Answer
(C)
4
28
Which of these is equivalent to the binary number 11111111?
Answer
(A)
255
29
What are the main uses for MAC addresses and IP addresses in a computer network?
Answer
A
B
30
Which of the following is a characteristic of the hexadecimal numbering system?
Answer
(B)
Uses digits 0-9 and letters A-F.
31
What does a left bit shift effectively do to a binary number?
Answer
(B)
Multiplies the number by 2
32
What does the term 'sample rate' mean in audio processing?
Answer
(A)
The number of samples taken per second.
33
If you shift the binary number 11000 right by one position, what is the result?
Answer
(A)
01100
34
In the context of data compression, what is the main goal of 'perceptual music shaping'?
Answer
(C)
To remove sounds inaudible to the human ear.
35
What is the decimal value of the binary number 1110?
Answer
(D)
15
36
Which number system is most efficient for representing the state of a computer's switch?
Answer
(C)
Binary
37
In data compression, what are the main aims?
Answer
A
B
C
38
What term is used to describe the number of bits used to store each audio sample?
Answer
(B)
Bit depth
39
In a computer, how many bits does a single hexadecimal digit represent?
Answer
(C)
4 bits
40
In binary addition, what is the result when adding 1 + 0?
Answer
(C)
1
41
What does RLE stand for in the context of data compression?
Answer
(B)
Run Length Encoding
42
Which of the following is true about HTML color codes?
Answer
(B)
Each color component is represented by two hexadecimal digits.
43
Which of the following compression methods is most suitable for compressing a photograph?
Answer
(C)
JPEG
44
What is the two's complement of the number 00000000?
Answer
(A)
00000000
45
What decimal value does the hexadecimal number 'B' represent?
Answer
(C)
11
46
What does it mean to shift the number 10110110 one bit to the left?
Answer
A
B
D
47
What is the significance of a MAC address on a network?
Answer
(A)
It is a unique identifier for network interfaces.
48
Which is an example of a lossless compression technique used for images?
Answer
(B)
PNG
49
What are the benefits of using hexadecimal for representing memory addresses?
Answer
A
B
50
What does the HTML color code #000000 represent?
Answer
(B)
Black