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Computer Science for IGCSE & O level - Data Representation (Section 8)

1
In the context of data compression, what does the term 'perceptual music shaping' refer to?
Answer
(B)
Removing sounds outside the human ear's range to reduce file size.
2
What does the term 'run' refer to in Run-Length Encoding (RLE)?
Answer
(C)
A sequence of identical data elements.
3
Which of the following is a true statement about the relationship between binary, denary and hexadecimal?
Answer
(B)
Hexadecimal is often used as a shorthand representation of binary data.
4
Which of the following is a use of the hexadecimal system?
Answer
(D)
All of the above
5
Convert the binary number 11110000 to decimal.
Answer
(A)
240
6
What is the primary function of an Analog-to-Digital Converter (ADC)?
Answer
(B)
To convert analog signals to digital signals.
7
Which system is referred to as the base-10 number system?
Answer
(C)
Decimal
8
Which of the following is a key difference between binary and hexadecimal number systems?
Answer
(C)
Binary uses base-2 and hexadecimal uses base-16.
9
What are the potential benefits of using data compression?
Answer
A
B
10
What is the result when the binary number 1010 is converted to decimal?
Answer
(B)
10
11
What is the hexadecimal representation of the decimal number 255?
Answer
(A)
FF
12
What is an advantage of using a higher sampling rate for an audio recording?
Answer
(B)
More accurate representation of the original sound.
13
What are some typical applications of hexadecimal notation?
Answer
A
C
14
Which number system uses digits 0-9 and the letters A-F?
Answer
(C)
Hexadecimal
15
What best describes how the value of a number changes when performing bitwise shifting?
Answer
A
C
16
What does a higher sampling rate in audio recording typically result in?
Answer
(C)
More accurate representation of the original sound.
17
How is the inversion of bits achieved in the process of obtaining the two's complement of a binary number?
Answer
(C)
By changing each 0 to 1 and each 1 to 0.
18
What is the primary purpose of data compression techniques?
Answer
(B)
To reduce the amount of storage space required for the data.
19
What is the effect of increasing the image resolution while keeping the physical size of the image constant?
Answer
(C)
The image will have more detail.
20
What could be the result of a right bit shift operation on a positive binary number?
Answer
A
B
21
How does the hexadecimal number system facilitate working with binary data?
Answer
(B)
By providing a shorthand notation that is easily translated to binary.
22
What is a key use of the two's complement representation?
Answer
(C)
Simplifying arithmetic operations.
23
What is the result of adding the binary numbers 1011 and 0101?
Answer
(B)
10000
24
What is the equivalent of 2^20 bytes in more common terms?
Answer
(B)
1 MB
25
What does the term 'denary' refer to in computer science?
Answer
(B)
A base-10 number system.
26
What is the most significant advantage of using a 16-bit color depth over an 8-bit color depth?
Answer
(B)
It allows for the representation of more colors.
27
Which method is generally used to convert a decimal number to binary?
Answer
(B)
Repeated division by 2
28
What are the advantages of using hexadecimal notation for representing data?
Answer
A
C
29
Consider the hexadecimal value of 1F. What is the equivalent decimal value?
Answer
(B)
31
30
What is the main function of a codec?
Answer
(B)
To compress and decompress data.
31
What is the purpose of using hexadecimal numbers in computer science?
Answer
(B)
To make binary numbers easier to read and work with.
32
What does 'sampling resolution' affect in a sound file?
Answer
(D)
The quality of the sound
33
Which number system is most commonly used for representing colors in HTML?
Answer
(C)
Hexadecimal
34
What is the role of remainders in the process of converting a decimal number to binary?
Answer
(A)
They represent the coefficients of each power of 2 in the binary representation.
35
How does color depth impact image files?
Answer
A
B
36
What aspect does the 'sampling rate' in audio recording define?
Answer
(C)
The number of samples captured per second.
37
What are the key benefits of representing data in binary within a computer system?
Answer
B
C
38
When converting between decimal and binary, what is the process used to obtain the binary value?
Answer
(A)
Repeatedly dividing by two and noting the remainders.
39
Which of the following is a correct binary representation of the decimal number 5?
Answer
(C)
101
40
In the context of image storage, what is the definition of color depth?
Answer
(B)
The number of colors an image can display.
41
How is the green component typically represented in an HTML color code?
Answer
(B)
The middle two hexadecimal digits.
42
Which of the following accurately describes the relationship between decimal, binary, and hexadecimal?
Answer
A
C
43
What is the hexadecimal equivalent of the decimal number 16?
Answer
(A)
10
44
In the context of images, what does color depth refer to?
Answer
(C)
The number of different colors that can be displayed.
45
What base is the hexadecimal number system?
Answer
(D)
Base-16
46
What is the purpose of MAC addresses?
Answer
(B)
To uniquely identify a device on a network.
47
What are some common image file formats that use lossy compression?
Answer
A
C
48
What is the primary role of the binary number system in computer operations?
Answer
(D)
To represent data using only two states, making hardware simpler.
49
Which of the following are advantages of hexadecimal?
Answer
A
B
50
What is the effect of increased image resolution on the sharpness of the image?
Answer
(B)
Increases sharpness