Advanced Science Primary 3 Diversity

Jun Jie scratches a plastic ruler with a metal key. The ruler gets a scratch. This shows that __________.

A The key is stronger than the ruler.
B The ruler is harder than the key.
C The key is harder than the ruler.
D The ruler is stronger than the key.
Show Worked Solution

Worked Solution

Step 1: Hardness is the ability to resist scratches. Step 2: A harder material will scratch a softer one. Step 3: Since the key scratched the ruler, the key is harder.

Correct answer: The key is harder than the ruler.

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