Year 7 Cambridge Computing Unit Test Mock Paper Walkthrough | 剑桥7年级计算机单元测试模拟卷解析

📚 Year 7 Cambridge Computing Unit Test Mock Paper Walkthrough | 剑桥7年级计算机单元测试模拟卷解析

This article provides a detailed walkthrough of a mock unit test for Year 7 Cambridge Computing. Each question is explained with clear answers and revision notes to help you prepare for your end-of-unit assessment. The topics covered include hardware, data representation, programming concepts, networks and online safety, reflecting the breadth of the Cambridge Lower Secondary Computing curriculum.

本文详细解析了一套针对剑桥7年级计算机课程的单元测试模拟卷，每道题配有清晰的答案与复习要点，助你从容应对单元考核。题目涵盖硬件、数据表示、编程思想、网络和安全等核心模块，贴合剑桥初中计算机课程大纲。

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1. Question 1: Input and Output Devices | 输入与输出设备

Question: Which of the following is classified as an input device? A) Printer B) Speaker C) Keyboard D) Monitor

题目：下列哪项属于输入设备？ A) 打印机 B) 音箱 C) 键盘 D) 显示器

Answer: C – Keyboard. An input device allows a user to send data to the computer. When you press a key, the keyboard transmits the character to the system. Printers and speakers are output devices because they present processed information to the user – a printer produces hard copies, and a speaker plays sound. A monitor is also an output device; it displays the visual interface.

答案：C – 键盘。输入设备用于向计算机送入数据，按下按键时，键盘将字符传送至系统。打印机和音箱属于输出设备，它们将处理后的信息呈现给用户——打印机输出纸质文档，音箱播放声音。显示器同样属于输出设备，用于展示视觉界面。

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2. Question 2: Binary to Decimal Conversion | 二进制转十进制

Question: What is the decimal value of the binary number 1101₂?

题目：二进制数 1101₂ 对应的十进制值是多少？

Answer: 13. We convert by adding the place values where a ‘1’ appears. Starting from the right, the columns are 2⁰ (1), 2¹ (2), 2² (4) and 2³ (8).

答案：13。转换时，将每一位‘1’对应的位权值相加。从右向左，位权依次为 2⁰ (1)、2¹ (2)、2² (4) 和 2³ (8)。

1101₂ = 1×8 + 1×4 + 0×2 + 1×1 = 8 + 4 + 0 + 1 = 13

1101₂ = 1×8 + 1×4 + 0×2 + 1×1 = 8 + 4 + 0 + 1 = 13

Binary numbers use only two digits, 0 and 1, and each position represents a power of two. This conversion is fundamental to understanding how computers represent numbers.

二进制数仅使用 0 和 1，每个数位代表 2 的幂次。掌握这一转换是理解计算机如何表示数字的基础。

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3. Question 3: Hardware Components – CPU | 硬件部件——中央处理器

Question: What does the abbreviation CPU stand for?

题目：缩写 CPU 代表什么？

Answer: Central Processing Unit. The CPU is often called the ‘brain’ of the computer. It carries out instructions from programs by performing arithmetic, logic and control operations. Every time you open an application or click a button, the CPU processes those commands.

答案：中央处理器 (Central Processing Unit)。CPU 常被称作计算机的‘大脑’，它通过执行算术、逻辑和控制操作来运行程序指令。每当你打开一个应用程序或点击按钮，CPU 都会处理这些命令。

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4. Question 4: Data Storage Units | 数据存储单位

Question: Arrange the following units from smallest to largest: Gigabyte, Kilobyte, Byte, Megabyte.

题目：将下列存储单位从小到大排列：吉字节 (GB)、千字节 (KB)、字节 (B)、兆字节 (MB)。

Answer: Byte, Kilobyte, Megabyte, Gigabyte. One byte usually stores a single character. A kilobyte is about one thousand bytes (1024 B if using binary prefixes), a megabyte is roughly one million bytes, and a gigabyte is approximately one billion bytes.

答案：字节 (B) → 千字节 (KB) → 兆字节 (MB) → 吉字节 (GB)。一个字节通常存储一个字符；千字节约为一千字节（二进制前缀下为 1024 B）；兆字节约一百万字节；吉字节约十亿字节。

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5. Question 5: Scratch Programming – Loops | Scratch 编程——循环

Question: In Scratch, which block would you use to make a sprite perform the same action exactly ten times?

题目：在 Scratch 中，要让一个角色重复执行同一动作恰好十次，应该使用哪个积木块？

Answer: The ‘repeat 10’ block (from the Control category). This block creates a counted loop that runs the enclosed code a specific number of times. Loops help programmers avoid writing the same instructions over and over. For example, you can place a ‘move 10 steps’ inside a ‘repeat 10’ block to move the sprite 100 steps in total.

答案：控制类别中的‘重复执行 10 次’积木。该积木创建一个计数循环，将内部代码重复执行指定的次数。循环可以避免程序员反复编写相同指令。例如，在‘重复执行 10 次’积木中放入‘移动 10 步’，角色就会总共移动 100 步。

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6. Question 6: Variables in Programming | 编程中的变量

Question: What is a variable in programming? Give an example of how a variable might be used in a simple game.

题目：编程中什么是变量？请举一个在简单游戏中可能用到变量的例子。

Answer: A variable is a named storage location in memory that holds a value which can change while the program runs. In a game, a ‘score’ variable might start at 0 and increase by 1 each time the player collects a coin. Other examples include ‘lives’ or ‘time remaining’. Variables are essential for tracking state and making programs interactive.

答案：变量是内存中一个命名的存储位置，其保存的值可以在程序运行时改变。在游戏中，‘分数’变量可能从 0 开始，玩家每收集一枚金币就增加 1。其他例子还有‘生命值’或‘剩余时间’。变量对于跟踪状态和实现程序互动至关重要。

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7. Question 7: Networks and the Internet | 网络与互联网

Question: State one key difference between the Internet and the World Wide Web.

题目：说出互联网 (Internet) 与万维网 (World Wide Web) 的一个主要区别。

Answer: The Internet is the physical network infrastructure – a global system of interconnected computer networks using cables, routers and satellites. The World Wide Web is a service that runs on top of the Internet; it is the collection of webpages, images and videos accessed through a web browser. In other words, the Internet is the hardware and connections, while the Web is the information shared over that network.

答案：互联网是由电缆、路由器和卫星等构成的全球互连计算机网络基础设施；万维网则是运行于互联网之上的一种服务，是通过网页浏览器访问的网页、图像和视频的集合。简而言之，互联网是硬件和连接，而万维网是在该网络上共享的信息。

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8. Question 8: Online Safety – Strong Passwords | 网络安全——强密码

Question: Which of the following passwords is the strongest? A) password123 B) 12345678 C) P@ssw0rd!2023 D) qwerty

题目：以下哪个密码最强？ A) password123 B) 12345678 C) P@ssw0rd!2023 D) qwerty

Answer: C – P@ssw0rd!2023. A strong password includes a mix of uppercase and lowercase letters, numbers and symbols. It should also be at least eight characters long and avoid common words or predictable sequences. Options A, B and D use easily guessable patterns or dictionary words, making them weak.

答案：C – P@ssw0rd!2023。强密码应混合大小写字母、数字和符号，长度至少为 8 个字符，并避免使用常见单词或可预测的序列。选项 A、B 和 D 均使用了容易猜测的模式或词典词汇，因此强度很弱。

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9. Question 9: Algorithm Design – Flowcharts | 算法设计——流程图

Question: In a flowchart, what does a diamond-shaped symbol represent?

题目：在流程图中，菱形符号表示什么？

Answer: A decision (or condition). The diamond box contains a question that can be answered with ‘Yes’ or ‘No’ (or ‘True’/‘False’). The flow then splits into different paths depending on the answer. Other standard symbols include the oval for Start/End, the rectangle for a process, and the parallelogram for input/output.

答案：菱形代表判断（或条件）。菱形框内包含一个可用‘是/否’（或‘真/假’）回答的问题，流程根据答案走向不同的分支。其他标准符号包括：椭圆代表开始/结束，矩形表示处理步骤，平行四边形表示输入/输出。

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10. Question 10: Computational Thinking – Decomposition | 计算思维——分解

Question: Define decomposition in computational thinking and give a real-life example of its use.

题目：定义计算思维中的‘分解’概念，并给出一个现实生活中的应用例子。

Answer: Decomposition is the process of breaking down a complex problem or system into smaller, more manageable parts. This makes it easier to understand, solve and assign tasks. For instance, planning a birthday party can be decomposed into sub-tasks: create a guest list, choose a venue, order a cake, arrange entertainment and send invitations. Each smaller task can then be tackled individually.

答案：分解是将复杂问题或系统拆解为更小、更易于管理的部分的过程，这使得问题更容易理解、解决和分配任务。例如，策划一场生日派对可以分解为子任务：拟订宾客名单、选择场地、订购蛋糕、安排娱乐活动、发送邀请，每个小任务可以分别处理。

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Published by TutorHao | Computing Revision Series | aleveler.com

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