Question 1
1 mark將十六進制數字 $$D4_{16}$$ 轉換為二進制數字。
Senior Secondary (HKDSE) · Information and Communication Technology
Data Representation : Practice Questions
5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Data Representation .
10 questions24 marksFree, no account
Question 2
1 mark一個電腦系統使用 8 位元二補碼 (Two's Complement) 表示法。如果執行以下運算：
\((-120)_{10} + (-10)_{10}\)
下列哪項關於運算結果的描述是正確的？
Question 3
1 mark關於數碼圖像的檔案格式與特性，下表顯示了同一張原始照片在不同處理下的結果：
檔案 X：\( 1.2 \text{ MB} \)，支持透明背景。
檔案 Y：\( 450 \text{ KB} \)，顏色過渡處有輕微塊狀模糊。
檔案 Z：\( 8.5 \text{ MB} \)，完全保留拍攝時的所有細節。
請判斷這三個檔案最可能的格式：
Question 4
1 mark以下哪種檔案格式最常用於網絡串流影片，並提供了良好的壓縮率和相對較小的檔案大小？
Question 5
1 mark考慮一個包含 1,000 個繁體中文字符和 2,000 個英文字符的純文字檔案。若分別使用 Big-5、UTF-8 和 UTF-16 編碼儲存該檔案，下列關於檔案大小（不計檔案頭）的排序哪項是正確的？
Question 6
2 marksASCII (美國信息交換標準碼) 主要用於編碼哪種類型的數據？
Write your answer out first, then check it against the worked solution.
Question 7
4 marks將十進制數字 $$42$$ 轉換為十六進制數字。
Write your answer out first, then check it against the worked solution.
Question 8
2 marks在電腦系統中，一個位元 (bit) 可以表示多少種不同的狀態？
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Question 9
5 marks字符編碼是電腦系統中表示文字字符的關鍵技術。
a) 請解釋字符編碼 (character encoding) 的基本概念。
b) 比較美國信息交換標準碼 (ASCII) 和統一碼 (Unicode) 在表示字符能力上的主要差異。
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Question 10
6 marks多媒體數據在電腦中以數碼形式表示。
a) 請描述聲音是如何被數碼化（Digitization）的，並列出三個主要步驟。
b) 比較 WAV 格式和 MP3 格式在音頻數據表示和壓縮方面的主要區別和應用場景。
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