principle (rule) vs principal

This type of question, asked 2 times: 18 Sep 2024 S2, 21 Sep 2025 S2. All 2 questions below, oldest first.

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Question 1
18 Sep 2024 S2
85 $The following sentence has been split into segments. Identify the segment that contains an error. If you don’t find any error, mark ‘No error’ as your answer. People admired him, for / he lived by the same principals / that he preached.$
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Question 2
21 Sep 2025 S2
91 $Find the part of the sentence that contains an error: He objected to the new policy (1)/ on the grounds that (2)/ it violated the principle rights (3)/ of the employees. (4)/$
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Question 1