📚 GCSE OCR Physics: Ace Multiple Choice Questions – Top Tips | GCSE OCR 物理：选择题秒杀技巧
In OCR GCSE Physics, multiple-choice questions (MCQs) are designed to test your understanding and your ability to apply concepts quickly. With the right shortcuts, you can often eliminate wrong options without fully solving the problem. This guide presents a set of tried-and-tested “instant kill” techniques to help you pick up marks efficiently under timed conditions.
在OCR GCSE物理中，选择题旨在考察你的理解程度和快速应用概念的能力。借助正确的捷径，你常常无需完整解题就能排除错误选项。本指南提供一套经过验证的“秒杀”技巧，帮助你在限时条件下高效拿分。
1. Unit Elimination – Let the Units Do the Work | 单位排除法——让单位帮你筛选
Many MCQs ask you to identify a physical quantity or a calculated value. Before diving into equations, scan the units in the answer choices. If the unit does not match the quantity being requested, that option can be discarded instantly. For instance, a question asking for speed (m/s) cannot have an answer in m/s² or N.
许多选择题要求你识别物理量或计算数值。在套用公式之前，先浏览选项中的单位。如果单位与所求物理量不匹配，该选项可立即丢弃。例如，求速度（m/s）的题目，答案不可能为 m/s² 或 N。
Be especially alert to unit traps: a distance given in cm and time in minutes. Convert everything to base SI units (m, s, kg, etc.) before comparing with the options. If an option shows a number that looks plausible but corresponds to ‘cm/s’, while the question expects m/s, it is a distractor.
尤其要警惕单位陷阱：题干距离用厘米、时间用分钟。在跟选项比较之前，把所有量换算成基本国际单位（米、秒、千克等）。如果某个选项数字看起来合理但实际对应“厘米/秒”，而题目要求“米/秒”，那它就是一个干扰项。
Table 1 lists common quantities and their SI units. Use it for quick mental checks.
表 1 列出了常见物理量及其国际单位，可用于快速心算核对。
| Quantity | 物理量 | SI Unit | 国际单位 | Symbol | 符号 |
|---|---|---|
| Speed / velocity | metre per second | m/s |
| Acceleration | metre per second squared | m/s²Published by TutorHao | GCSE Physics Revision Series | aleveler.com
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