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