Year 7 CAIE Physics Unit Test Mock Exam Analysis | Year 7 CAIE 物理：单元测试模拟卷解析

📚 Year 7 CAIE Physics Unit Test Mock Exam Analysis | Year 7 CAIE 物理：单元测试模拟卷解析

This article provides a step-by-step walkthrough of a mock unit test for Year 7 CAIE Physics. Each question is explained in detail, covering key scientific concepts, common mistakes, and effective revision strategies. Use this analysis to strengthen your understanding and boost your confidence before the real test.

本文针对 Year 7 CAIE 物理单元测试模拟卷进行逐步解析。每道题都详细解释了核心科学概念、常见错误和有效的复习策略。利用这份解析来加深理解，在实际测试前增强信心。

1. Measuring Length Accurately | 准确测量长度

A student measures a pencil using a ruler marked in centimetres and millimetres. The tip of the pencil is placed exactly at the 0 cm mark. The other end lies between 12.3 cm and 12.4 cm, much closer to 12.4 cm. What is the length in centimetres and in metres?

一位学生用一把标记厘米和毫米的尺子测量铅笔的长度。铅笔尖端恰好对准 0 cm 刻度，另一端落在 12.3 cm 和 12.4 cm 之间，非常靠近 12.4 cm。该铅笔长度是多少厘米？合多少米？

The correct reading is 12.4 cm because we always estimate one more digit beyond the smallest scale division. Since the reading is clearly nearer to 12.4 cm than to 12.3 cm, we record 12.4 cm. To convert centimetres to metres, divide by 100: