AQA A-level Physics Unit 3 Mark Scheme Jan 2021: Key Points and Revision Guide | AQA A-level 物理 Unit 3 2021年1月考试评分方案：核心考点与复习指南

📚 AQA A-level Physics Unit 3 Mark Scheme Jan 2021: Key Points and Revision Guide | AQA A-level 物理 Unit 3 2021年1月考试评分方案：核心考点与复习指南

This article breaks down the key messages from the AQA A-level Physics Unit 3 mark scheme for the January 2021 session. It is not a replacement for the official document, but a structured revision guide to help you understand how marks are awarded for practical skills, data analysis and evaluation. Use it alongside past papers to spot patterns in examiner expectations.

本文梳理 AQA A-level 物理 Unit 3 2021 年 1 月考试评分方案中的关键信息。本文并非官方文件，而是一份结构化复习指南，帮助你理解实验技能、数据分析和评价类题目如何给分。建议结合历年真题使用，以发现考官评分规律。

1. Understanding the Mark Scheme Format | 理解评分方案结构

The Unit 3 mark scheme uses two main columns: ‘answer’ and ‘marking guidance’. Marks are often divided into AO2 (application) and AO3 (evaluation). For calculation questions, look for ‘allow’ and ‘ignore’ statements; these show acceptable alternative answers and errors that do not lose marks.

Unit 3 评分方案通常分为两栏：“答案”和“评分说明”。分值常划分为 AO2（应用）和 AO3（评价）。在计算题中，注意 “allow”（允许）和 “ignore”（忽略）字样，它们表示可接受的替代答案以及不扣分的错误。

• M marks are method marks for a correct approach.
  M 分是方法分，只要思路正确即可获得。
• A marks are accuracy marks for a correct final answer.
  A 分是准确分，答案正确才能获得。
• B marks are independent marks for a specific statement.
  B 分是独立分，只针对某一具体陈述给分。

2. Command Words and What Examiners Expect | 指令词及考官期望

In January 2021, Unit 3 questions used command words such as ‘state’, ‘describe’, ‘explain’, ‘calculate’, ‘determine’, ‘comment on’ and ‘evaluate’. Each command word triggers a different skill. ‘State’ wants a short recalled fact; ‘explain’ requires a linked scientific reason; ‘evaluate’ requires a judgement supported by evidence.

2021 年 1 月的 Unit 3 试题使用了 state, describe, explain, calculate, determine, comment on 和 evaluate 等指令词。不同指令词考查不同能力。state 只需简短写出已知事实；explain 需要有条理的科学解释；evaluate 需要结合证据给出判断。