Computer Science for IGCSE & O level - Data Representation (Section 12)
1
What will be the result of a right bit shift on the binary number 110000, two places to the right?
2
What is a benefit of using lossless compression techniques?
3
In a bitmap image, what does increasing the resolution do?
پاسخ دهید(B)
Increases the level of detail
4
What is the decimal equivalent of the binary number 10101?
5
In digital audio, which of the following is most closely related to how accurately the original sound is reproduced?
6
What operation is performed when shifting a binary number two places left?
7
What is the maximum value represented by a single hexadecimal digit?
8
In the context of images, what does the term 'pixel' stand for?
9
What is the primary reason for compressing files before transmitting them over a network?
پاسخ دهید(C)
To reduce the time it takes to transfer the file.
10
What is the purpose of an IP address?
پاسخ دهید(B)
To locate a device on the internet.
11
What does a higher sample rate generally indicate for an audio file?
پاسخ دهید(A)
A higher file size and potentially higher sound quality.
12
What is a key factor determining the quality of a sound file?
پاسخ دهید(C)
The bit depth of the samples.
13
Consider the following string: "WWWWWWBBBBBBBB" How would run-length encoding compress this string?
14
What does the hexadecimal number system use for representation?
15
What is the difference between an uncompressed file and a compressed file?
پاسخ دهید(A)
An uncompressed file is larger than a compressed file.
16
Which of the following best describes the operation of JPEG compression on an image?
پاسخ دهید(B)
It reduces the file size by discarding some of the image data.
17
What is the value of the binary number 101010 in decimal?
18
What is the relationship between file size and image resolution?
پاسخ دهید(A)
File size increases with higher resolution.
19
Which of the following is a direct advantage of using hexadecimal numbers over binary when representing data?
پاسخ دهید(A)
Hexadecimal is easier for humans to read and understand than binary.
20
For which type of data would Run Length Encoding (RLE) be most effective?
21
Which of the following correctly describes how sound is digitized for computer processing?
22
In the context of images, what is meant by the term 'resolution'?
پاسخ دهید(C)
The number of pixels used to create the image.
23
What does the term 'error code' usually refer to in the context of computer systems?
پاسخ دهید(A)
A code used to identify and resolve errors in software.
24
What is the main effect of a higher color depth on a digital image?
پاسخ دهید(B)
It increases the potential number of colors that can be displayed.
25
What is generally NOT a primary goal of data compression?
26
In an image, what do you call the smallest single component?
27
What does the '1' in the leftmost position of an 8-bit two's complement number represent?
28
Which statement describes the basic principle of two's complement representation?
پاسخ دهید(A)
It simplifies subtraction by turning it into addition.
29
What is the meaning of 'bit' in computer science?
پاسخ دهید(B)
A single binary digit (0 or 1).
30
In the context of image file formats, what are the main characteristics of a PNG file?
31
What is the purpose of a network interface controller (NIC) in relation to a MAC address?
پاسخ دهید(B)
Uses the MAC address for communication
32
In ASCII, which bit(s) are different between the lowercase and uppercase versions of a letter?
33
If you need to reduce the file size of a photograph while maintaining decent visual quality, which compression technique would be most appropriate?
34
What is the main difference between lossy and lossless compression?
پاسخ دهید(A)
Lossy compression reduces file size by discarding data; lossless compression does not.
35
Which option best describes the primary goal of data compression?
پاسخ دهید(B)
Reduce a file's size to save storage space or speed up transfer.
36
What is the role of logic gates in computers?
پاسخ دهید(D)
To process and manipulate data using binary inputs.
37
What happens to the sound quality when a higher sampling rate is used for an audio file?
38
What type of compression eliminates unnecessary data from a file, and the original file cannot be reconstructed once it has been compressed?
39
What is one disadvantage of lossy compression?
40
What are the 3 key components of the digital representation of an image?
41
Which of the following is NOT a use of hexadecimal numbers?
42
What is the primary purpose of run-length encoding (RLE)?
پاسخ دهید(B)
To reduce the size of a string of identical data items.
43
What is the range of unsigned integers that can be stored in 4 bits?
44
If you shift the binary number 11000 one place to the right, what is the result?
45
Which of the following factors determines the size of an image?
46
What is the decimal equivalent of the hexadecimal number 2A?
47
In a two's complement representation, what does a leading '0' (zero) typically indicate?
48
In the context of converting from binary to hexadecimal, what is the first step?
پاسخ دهید(B)
Split the binary number into groups of 4 bits, starting from the right.
49
If you have a 1MB image with 8-bit color depth, and you change the color depth to 24-bit, what is the approximate resulting file size?
50
What is the role of the 'sign bit' in a two's complement representation?
پاسخ دهید(B)
It indicates whether the number is positive or negative.
