Computer Science for IGCSE & O level - Data Representation (Section 16)
1
When converting a negative decimal number to two's complement binary, which steps are involved?
2
What is the main disadvantage of ASCII code?
إجابة(B)
It cannot represent non-English characters.
3
Which of the following is most closely related to the quality of an image?
4
In the context of sound, which property relates to the pitch of a sound?
5
When converting from binary to decimal, what operation is performed on the binary digits?
6
Which factor primarily determines the amount of data that can be stored on a hard drive?
إجابة(B)
The hard drive's capacity.
7
What is the decimal equivalent of the binary number 1111?
8
If the most significant bit (MSB) is set to '1' in a two's complement representation, what does it typically signify?
9
Which of the following is a key characteristic of lossless compression?
إجابة(C)
The original file can be perfectly reconstructed.
10
What is the hexadecimal equivalent of the decimal number 20?
11
What will be the result of the binary addition of 1011 + 0101?
12
What is the purpose of using a higher sampling rate for digital audio?
إجابة(C)
To capture sound more accurately.
13
What do the number of bits used to represent a pixel's colour determine?
إجابة(C)
The number of colours possible.
14
How does two's complement representation handle negative numbers?
إجابة(C)
By inverting all the bits and adding 1 to the result.
15
In the context of computer memory, how many bits are in a byte?
16
Which factor(s) is/are directly related to the quality of a digital audio recording?
17
If an image has a resolution of 640 x 480 pixels and a color depth of 8 bits per pixel, how many bytes of storage are required?
18
What is the smallest possible value in a 8-bit two's complement system?
19
What does a higher image resolution typically result in?
إجابة(D)
Larger file size and more detail.
20
What type of compression is typically used to reduce the size of audio files?
21
What is the role of the leftmost bit in a two's complement representation?
إجابة(C)
It indicates the sign (positive or negative) of the number.
22
What is the role of color depth in image file sizes?
إجابة(B)
It impacts the number of colors represented, and therefore the file size.
23
How are HTML color codes usually written?
إجابة(C)
Using hexadecimal numbers
24
Which of the following is a characteristic of a 'lossy' compression method?
إجابة(B)
The file size is reduced.
25
How many bytes are used to represent an ASCII character?
26
What does a hexadecimal number consist of?
إجابة(C)
Letters A-F and numbers 0-9
27
What is the fundamental principle that allows subtraction to be performed using addition in two's complement?
إجابة(A)
Inverting the bits and adding 1.
28
What is the process of representing sound in a digital format called?
29
What is the value of the hexadecimal digit 'F' in decimal?
30
What is the function of the Extended ASCII character set?
إجابة(B)
To represent non-English characters and other symbols.
31
Which color is usually represented by #FF0000 in HTML color codes?
32
What is the main difference between analog and digital signals?
إجابة(A)
Analog signals are continuous, digital signals are discrete.
33
What are the components that determine the overall image quality of bitmap images?
34
What does 'color depth' mean in the context of digital images?
إجابة(C)
The number of colors that can be displayed.
35
If you double the resolution (width and height) of an image, how many times larger will the uncompressed file be?
36
In digital audio, what does 'bit depth' determine?
إجابة(C)
The accuracy of the amplitude measurements.
37
Which of the following statements about binary numbers is correct?
إجابة(C)
Binary numbers are base-2, using only 0 and 1.
38
Which of the following are advantages of using hexadecimal over binary in computer science? (Select all that apply)
39
In what scenarios would you choose Lossless compression over Lossy compression?
40
What is the decimal equivalent of the binary number 10000000 in two's complement form?
41
What happens to the rightmost bits during a left bit shift?
إجابة(D)
They are replaced by zeros.
42
What type of content is RLE compression well-suited for?
43
Which of the following are uses of hexadecimal numbers?
44
What is the result of the two's complement conversion of -3 using 4 bits?
45
What is one of the primary applications of RLE (Run Length Encoding)?
إجابة(B)
Compression of images with large areas of the same color.
46
What does the abbreviation 'RGB' stand for in the context of computer graphics and HTML?
47
Which of the following is a characteristic of a high-quality audio file?
48
If an image has a bit depth of 4, how many possible colors can each pixel have?
49
What does increasing the resolution of an image mean in terms of pixels?
إجابة(C)
More pixels are used to represent the image.
50
Which is a correct application of the concept of representing data in binary?
