You can picture an exam as a weighing-scale for what's in your head: you set your knowledge on the balance, and the test shows how much is really there and where the needle stops.
From the word’s history
exam is short for examination. Its Latin root examen meant the tongue (pointer) of a balance—the needle that shows the weight; examinare was "to weigh." An exam still weighs what you know.
exam 是 examination 的縮寫。字根 examen 在拉丁文裡指天平上的指針——那根顯示重量的針；examinare 就是「秤重」。考試至今仍是在秤你會多少。
etymonline.com/word/examination; Merriam-Webster (examen < Latin examen 'tongue of a balance', from examinare 'to weigh')
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原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
examverb/ɪɡˈzæm/
- 1
sciencesShortened form of examine
- Thin sections were stained with lead citrate and then examed using 1200EX electron microscope (JEOL, Tokyo, Japan).
這個拼法也被記錄為下列字的變化形：
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。