Standard Science Primary 3 Diversity

Jun Jie conducted an experiment by scratching Material X with Material Y. He observed that Material Y left a deep scratch on Material X. What can he conclude?

A Material X is more flexible than Material Y.
B Material Y is heavier than Material X.
C Material Y is harder than Material X.
D Material X is stronger than Material Y.
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Worked Solution

Step 1: Scratching is the standard test for hardness. Step [2-9]: A harder material will scratch a softer material. Step [2-9]: Since Y scratched X, Y is harder.

Correct answer: Material Y is harder than Material X.

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