Computer Science for IGCSE & O level - Data Representation (Section 9)
1
What is the hexadecimal equivalent of the binary number 1111?
2
What does '16-bit audio' mean in terms of digital audio?
پاسخ دهید(B)
Each audio sample is represented using 16 bits.
3
What is the principal benefit of data compression?
4
What is the function of an IP address?
پاسخ دهید(C)
To enable communication between devices on a network.
5
Which of the following is a valid hexadecimal digit?
6
What is the binary representation of the decimal number 10?
7
What is a 'byte' typically composed of?
8
What is a benefit of using Hexadecimal over Binary?
9
Why is hexadecimal used in computer science for things like memory addressing?
پاسخ دهید(B)
It provides a more readable and compact way to represent binary addresses.
10
Which statement accurately describes the relationship between the sampling rate and the accuracy of the audio signal representation?
پاسخ دهید(B)
Higher sampling rate leads to higher accuracy.
11
How can you improve the visual quality of a digital sound recording?
12
What is the range of integers that can be represented using 4 bits in two's complement format?
13
What are the common goals of employing data compression techniques?
14
Which type of compression is most suitable when it is essential to preserve the original data completely?
15
What color is typically represented by the HTML color code #0000FF?
16
Which part of a computer's system relies heavily on binary representation to function?
پاسخ دهید(C)
Central Processing Unit (CPU)
17
Which of the following are properties of a MAC address?
18
Which part of an IPv4 address is represented in hexadecimal notation?
پاسخ دهید(D)
IPv4 addresses are not represented in hexadecimal.
19
What is the main purpose of RLE compression?
پاسخ دهید(B)
Compressing text strings with repeated characters.
20
Which factors influence the file size of a sound file?
21
Which type of compression guarantees complete data reconstruction?
22
What is the typical function of a MAC address?
پاسخ دهید(A)
To identify devices on a network
23
What does the term 'bit' stand for?
24
In the context of digital audio, what is 'noise' often caused by?
25
What are error codes often used for in software development?
26
What is the effect of using a higher sampling rate for sound recording?
پاسخ دهید(B)
Higher audio quality and larger file size.
27
What is the base of the binary number system?
28
What color is represented by the hexadecimal code #008000?
29
What are some common applications of hexadecimal notation in computer science?
30
Which of the following describes the effect of increasing the frame rate of a video?
پاسخ دهید(A)
It makes the video appear to move more smoothly.
31
What is the denary (decimal) equivalent of the hexadecimal number 4F?
32
What is the purpose of sampling in sound recording?
پاسخ دهید(B)
To convert analog sound into digital data
33
What is the purpose of the two's complement format?
34
Convert the decimal number 75 into hexadecimal.
35
Which factor primarily determines the file size of a digital image?
37
If you have an 8-bit register, what is the maximum decimal value you can represent?
38
What is the binary representation of the hexadecimal value "A"?
39
What is the denary (decimal) value of the hexadecimal number 1A?
40
When converting from hexadecimal to decimal, what does each position (place value) represent?
41
What is the result of the hexadecimal addition of A + 5?
42
What are the characteristics of a lossy compression method?
پاسخ دهید(B)
It can result in smaller file sizes.
43
What is the purpose of error codes in programming?
پاسخ دهید(B)
To provide information about errors that occur.
44
What is the primary difference between a logical shift and an arithmetic shift?
پاسخ دهید(B)
Arithmetic shifts preserve the sign bit, logical shifts do not.
45
What is the relationship between the bit depth used for audio and the potential dynamic range of the audio?
پاسخ دهید(C)
Higher bit depth means a greater dynamic range.
46
What is the two's complement of the binary number 1100 (using 4 bits)?
47
Which of the following is most commonly used for defining colors in HTML?
48
What does the hexadecimal color code #00FF00 represent?
49
Which file formats typically use lossy compression?
50
What impact does increasing the bit depth of a sound recording have?
