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Year 8 CCEA Computing: Unit Test Mock Paper Walkthrough | Year 8 CCEA 计算机：单元测试模拟卷解析

2026-07-17 21:54 · 本文部分内容由AI辅助创作

📚 Year 8 CCEA Computing: Unit Test Mock Paper Walkthrough | Year 8 CCEA 计算机：单元测试模拟卷解析

This mock paper walkthrough is designed to help Year 8 students following the CCEA Computing curriculum review key concepts before their unit test. The ten questions below match the style, wording and difficulty of a typical class assessment, and they cover the essential topics of the course: hardware, software, binary numbers, online safety, algorithms, programming in Scratch, spreadsheets, data representation and file management. Every question comes with the correct answer and a clear, full explanation, so you can see not only which option is right but why the other options are wrong. Use this resource at the end of a revision session to check your knowledge, then return to any topic you found difficult and build your confidence for the real assessment.

本模拟卷解析旨在帮助学习 CCEA 计算机课程的八年级学生在单元测试前复习重点概念。下面十道题的题型、措辞和难度都与课堂测试接近，涵盖课程中的核心主题：硬件、软件、二进制数、网络安全、算法、Scratch 编程、电子表格、数据表示以及文件管理。每道题都提供正确答案和清晰的完整解析，让你不仅知道选哪一项，还能明白其他选项为什么错。建议在复习结束前用这份资料检查自己的知识掌握情况，再回到薄弱主题查漏补缺，逐步提升考试信心。

1. How to Use This Mock Paper | 1. 如何使用这份模拟卷

Before you look at any answers, treat the paper like a real test. Give yourself about 40 minutes, work in silence, and write your answers down rather than reading the options and guessing in your head. Only when you have finished all ten questions should you turn to the answer key in Section 12 and mark your work honestly. The most valuable part of revision is not the score, it is the explanation that follows each answer, because that is where misconceptions are corrected.

在看答案之前，请把这份卷子当成真正的测试来对待。给自己大约 40 分钟，安静作答，并把答案写下来，而不是读一遍选项在心里猜。只有在十道题全部完成后，才翻到第 12 节的答案表，如实给自己打分。复习中最有价值的不是分数本身，而是每道题后面的解析，因为正是在那里你的错误理解会被纠正。

2. Question 1 - Input Devices | 2. 第1题：输入设备

Question 1: Which of the following is an input device?

题目1：下列哪一项是输入设备？

Answer: C. Keyboard.

答案：C. 键盘。

Explanation: An input device is any piece of hardware that sends data into a computer so that it can be processed. A keyboard lets you type letters, numbers and symbols into the system, so it is an , making it an input device. A monitor displays output on a screen, a printer produces output on paper, and a speaker produces output as sound, so all three are output devices. Other common input devices include the mouse, scanner, microphone, webcam, joystick, graphics tablet, barcode reader and touch sensor. Some devices are both input and output, for example a touchscreen, which shows information and also detects your finger as input.

解析：输入设备是指任何把数据送入计算机以便处理的硬件。键盘可以把字母、数字和符号输入系统，因此属于输入设备。显示器在屏幕上显示输出，打印机在纸上输出，音箱以声音形式输出，所以这三者都是输出设备。其他常见的输入设备还包括鼠标、扫描仪、麦克风、摄像头、游戏手柄、数位板、条形码阅读器和触摸传感器。有些设备既能输入也能输出，例如触摸屏，它既显示信息，又能感应手指的触碰作为输入。

3. Question 2 - Output Devices | 3. 第2题：输出设备

Question 2: Which device produces a hard copy of a document?

题目2：哪种设备可以生成文档的硬拷贝？

Answer: B. Plotter.

答案：B. 绘图仪。

Explanation: Output can be either a soft copy, which is displayed on a screen or stored digitally and can be edited, or a hard copy, which is printed onto paper and is physical. A plotter is an output device that prints large, precise drawings such as engineering plans, maps and architectural designs, so it produces a hard copy. A scanner converts a paper document into a digital image, a mouse is a pointing input device, and a microphone captures sound as input, so none of the other three creates output at all. When a question mentions paper, print or physical copies, think output.

解析：输出可以分为软拷贝和硬拷贝：软拷贝显示在屏幕上或以数字形式存储、可以编辑；硬拷贝则打印在纸上，是实物。绘图仪是一种输出设备，用于打印大型而精确的图样，如工程图、地图和建筑设计图，因此它产生硬拷贝。扫描仪把纸质文件转成数字图像，鼠标是指点类输入设备，麦克风把声音采样为输入，所以其他三个选项都不产生输出。题目中一旦出现纸张、打印或实物拷贝等字眼，就要想到输出。

4. Question 3 - System and Application Software | 4. 第3题：系统软件与应用软件

Question 3: Which of the following is system software?

题目3：下列哪一项属于系统软件？

Answer: B. Operating system.

答案：B. 操作系统。

Explanation: Software is the set of programs and instructions that tell hardware what to do. System software runs the computer itself: it manages the processor, memory, storage, files and peripherals, and it provides the platform on which other programs run. The operating system is the most important example, and Windows, macOS, Linux, Android and iOS are all operating systems. Utility programs such as antivirus tools, backup software and disk defragmenters are also classed as system software. A word processor, a spreadsheet and a web browser are application software, because they are written to help the user carry out a particular task.

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解析：软件是告诉硬件如何工作的一系列程序与指令。系统软件负责运行计算机本身：管理处理器、内存、存储、文件和外围设备，并为其他程序提供运行平台。操作系统是最重要的例子，Windows、macOS、Linux、Android 和 iOS 都属于操作系统。杀毒工具、备份软件和磁盘碎片整理程序等实用程序也归于系统软件。文字处理软件、电子表格软件和网页浏览器属于应用软件，因为它们的目的是帮助用户完成某项具体任务。

5. Question 4 - Binary to Denary Conversion | 5. 第4题：二进制转十进制

Question 4: What is the denary value of the binary number 0010 1101?

题目4：二进制数 0010 1101 的十进制值是多少？

Answer: B. 45.

答案：B. 45。

Explanation: ght are 128, 64, 32, 16, 8, 4, 2 and 1. For 0010 1101 the working is: 0 x 128 + 0 x 64 + 1 x 32 + 0 x 16 + 1 x 8 + 1 x 4 + 0 x 2 + 1 x 1 = 32 + 8 + 4 + 1 = 45. To convert in the other direction, subtract the largest place value you can, write a 1 there, and continue with the remainder. An 8-bit register can store 2⁸ = 256 different patterns, so denary values from 0 to 255.

解析：计算机使用二进制，是因为电路只有两种稳定状态：通电与断电，我们记作 1 和 0。在 8 位二进制数中，从左到右的位值是 128、64、32、16、8、4、2、1。对 0010 1101 而言，计算过程为：0 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 32 + 8 + 4 + 1 = 45。反过来转换时，先减去能减的最大位值并在该位写 1，再用余数继续。一个 8 位寄存器可以存放 2⁸ = 256 种不同组合，因此十进制范围是 0 到 255。

0010 1101₂ = 32 + 8 + 4 + 1 = 45₁₀

6. Question 5 - Data Representation and Units | 6. 第5题：数据表示与存储单位

Question 5: How many bytes are there in 2 KiB?

题目5：2 KiB 等于多少字节？

Answer: B. 2048.

答案：B. 2048。

Explanation: units increase by a factor of 1024: 1 KiB = 1024 bytes, 1 MiB = 1024 KiB, 1 GiB = 1024 MiB and 1 TiB = 1024 GiB. So 2 KiB = 2 x 1024 = 2048 bytes, which is 16 384 bits. Text is stored using character codes such as ASCII, images are stored as a grid of pixels each with a colour value, sound is stored as samples taken many times per second, and video is stored as a sequence of frames.

解析：位（bit）是最小的数据单位，取值为 1 或 0。8 位组成 1 个字节（byte），1 个字节足以存放一个字符。存储单位以 1024 为倍数递增：1 KiB = 1024 字节，1 MiB = 1024 KiB，1 GiB = 1024 MiB，1 TiB = 1024 GiB。所以 2 KiB = 2 × 1024 = 2048 字节，也就是 16 384 位。文本使用 ASCII 等字符编码存储，图像以像素网格存储、每个像素带颜色值，声音按每秒多次采样的方式存储，视频则存为一帧帧的画面序列。

7. Question 6 - Algorithms and Flowcharts | 7. 第6题：算法与流程图

Question 6: Which of the following best describes an algorithm?

题目6：下列哪一项最能说明算法的含义？

Answer: B. A set of clear steps that solves a problem.

答案：B. 解决问题的一组清晰步骤。

Explanation: An algorithm is a step-by-step plan for solving a problem. It must be precise so that anyone following it reaches the same result, it must have a clear order, and it must finish. Algorithms can be written as a numbered list, as pseudocode, or drawn as a flowchart. Decomposition means breaking a large problem into smaller sub-problems that are easier to solve, and abstraction means ignoring unnecessary detail. When you trace an algorithm by hand, work through it line by line and record the value of each variable as it changes.

解析：算法是解决问题的分步方案。它必须精确，任何人照着做都能得到相同结果；必须有明确顺序；并且必须能够结束。算法可以写成编号步骤、伪代码，或者画成流程图。分解（decomposition）指把大问题拆成更容易解决的小问题，抽象（abstraction）指忽略无关细节。手算追踪算法时，逐行执行并记录每个变量值的变化。

Symbol | 符号Meaning | 含义
Oval 椭圆Start or stop 开始或结束
Parallelogram 平行四边形Input or output 输入或输出
Rectangle 矩形Process or calculation 处理或计算
Diamond 菱形style="border:1px solid #
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