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Computer Science for IGCSE & O level - Data Representation (Section 7)

1
Which methods can be applied to efficiently compress text files?
Answer
A
B
2
What is the decimal equivalent of the hexadecimal value '1A'?
Answer
(C)
26
3
What does the HTML color code #008000 represent?
Answer
(B)
Green
4
When converting from binary to hexadecimal, how many bits are typically grouped together?
Answer
(C)
4 bits
5
If the 8-bit register is 11111111, what will be the result of shifting this register to the right one bit?
Answer
(A)
1111111
6
Which compression type aims to reduce file size by permanently removing data?
Answer
(C)
Lossy
7
What is a common use case for error codes in software development?
Answer
(C)
To indicate the presence of a problem and its type
8
What are some common applications where hexadecimal notation is used?
Answer
A
B
C
9
What does a single hexadecimal digit represent in terms of the number of bits?
Answer
(C)
4 bits
10
Which base number system is used by humans in everyday life?
Answer
(C)
Decimal
11
In the context of two's complement, what is the MSB (most significant bit) used for?
Answer
(B)
Indicating the sign of the number
12
Convert the decimal number 27 to binary.
Answer
(A)
11011
13
What type of file format is used to store images?
Answer
B
C
14
What is the key characteristic of the hexadecimal number system that makes it useful in computer science?
Answer
(C)
It provides a more compact representation of binary numbers.
15
What is the result of the binary addition 1100 + 0110?
Answer
(A)
10010
16
What is the binary equivalent of the decimal number 7?
Answer
(C)
111
17
What does a higher frame rate in a video generally result in?
Answer
(B)
Smoother motion
18
How are the on and off states of an electronic switch represented in the binary system?
Answer
(C)
By the numbers 0 and 1
19
What is the primary function of a bit in digital data representation?
Answer
(C)
To represent the smallest unit of data.
20
Which hexadecimal color code represents the color black?
Answer
(A)
#000000
21
What does the hexadecimal value 'A' represent in decimal?
Answer
(B)
10
22
What is the term for a group of four bits?
Answer
(B)
Nibble
23
How is an error code useful?
Answer
A
B
C
24
In two's complement, how is a negative value identified?
Answer
(B)
If the most significant bit is 1
25
Which of the following scenarios would best demonstrate the application of binary representation?
Answer
A
B
C
26
In the RLE process, what is the role of the repeating character?
Answer
(B)
It represents the pixel value being compressed.
27
Which factors affect the file size of an image?
Answer
A
B
C
28
What is the main benefit of using hexadecimal when working with memory addresses?
Answer
(B)
It provides a more concise and readable representation of long binary strings.
29
What is a MAC address used for?
Answer
(A)
Identifying a device on a network.
30
In an 8-bit two's complement system, what is the binary representation of -1?
Answer
(B)
11111111
31
What is the main advantage of using binary representation in computers?
Answer
(D)
It provides efficient hardware implementation.
32
How is data represented within a computer's memory?
Answer
(B)
As combinations of 0s and 1s.
33
Which of the following are considered benefits of data compression?
Answer
A
B
D
34
Which of the following accurately describes the relationship between binary and hexadecimal?
Answer
(C)
Hexadecimal is a more concise representation of binary.
35
In the context of binary representation, what is the difference between a 'bit' and a 'byte'?
Answer
(B)
A bit is a single binary digit, while a byte is a group of bits.
36
What does the term 'channel' mean in the context of sound recording?
Answer
(B)
A stream of audio information.
37
Which is a characteristic of a two's complement binary number representation?
Answer
(C)
Addition and subtraction can be performed directly.
38
What is the hexadecimal representation of the decimal number 60?
Answer
(A)
3C
39
What do the colours red, green, and blue represent?
Answer
(D)
All of the above
40
When converting from binary to hexadecimal, what does each group of 4 bits represent?
Answer
(B)
A hexadecimal digit.
41
Which systems can hexadecimal be utilized in?
Answer
A
B
C
42
Which number system is most commonly used by human beings in everyday life?
Answer
(C)
Denary
43
What is the decimal equivalent of the binary number 10011?
Answer
(C)
19
44
In the context of digital sound, what does bit depth represent?
Answer
(B)
The number of bits used to represent the amplitude of each sample.
45
What does the hexadecimal value 'FF' represent in HTML color codes?
Answer
(D)
White
46
What is the decimal value of the hexadecimal number '10'?
Answer
(B)
16
47
What are error codes used for in the context of a software or hardware system?
Answer
A
B
48
What happens during a right logical shift operation?
Answer
(B)
Zeros are added on the left.
49
What is the role of the MSB in a two's complement representation?
Answer
(A)
To define the sign of the number
50
What are the advantages of having a large number of samples (sampling rate) when converting sound into a digital format?
Answer
A
B
D