問 1
1 点When encoding sound digitally, what is the most likely result of increasing the sampling rate?
Cambridge International A Level · Computer Science (9618)
Information representation：練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 5 問。すべて「Information representation」からの出題です。
10 問24 点無料・登録不要
問 2
1 点A graphics designer is choosing between a vector graphic and a bitmapped image for a project. Which of the following statements correctly identifies a unique property of vector graphics representation?
問 3
1 点A computer system uses 10-bit two’s complement to represent integers. A calculation is performed to subtract \( Y \) from \( X \) (i.e., \( X - Y \)), where \( X = 256_{10} \) and \( Y = -256_{10} \).
Which statement correctly identifies the outcome of this operation and the state of the processor's overflow flag?
問 4
1 点Which of the following statements correctly describes a key difference between the ASCII character set and the Unicode character set?
問 5
1 点Unicode was developed to overcome the limitations of the original ASCII character set. Which of the following best describes the technical characteristic of Unicode that allows it to represent a significantly larger range of characters and symbols from global languages?
問 6
2 点Describe what is meant by overflow and explain why it might occur when a computer system performs addition on two \( 8 \text{-bit} \) unsigned binary integers.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 7
3 点Explain one practical application of Binary Coded Decimal (BCD) and describe why it is used instead of pure binary for that specific purpose.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 8
5 点Explain how Run-Length Encoding (RLE) can be used to compress a bitmapped image and identify the characteristics of an image that would result in a very low compression ratio using this method.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 9
4 点(a) Perform the following binary addition for two 8-bit unsigned integers. Show your working.
\( 10110011 + 01101010 \)
(b) Explain why an overflow error occurs in this specific calculation and how it would be detected by a processor.
(c) State the largest denary value that can be represented in an 8-bit unsigned binary register and the largest denary value for an 8-bit two's complement signed register.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 10
5 点A 1-byte register contains the binary value \( 01101100 \).
(a) Show the 8-bit binary result of performing a logical shift right by 2 places on the value in the register.
(b) Describe the mathematical effect of a logical shift right by \( n \) places on an unsigned binary integer.
(c) A programmer needs to check if the bit at position 2 (the third bit from the right) is set to 1. Explain how bit masking using the AND operator and a specific bit mask can be used to isolate this bit.
まず自分で答えを書いてから、解説と照らし合わせましょう。
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