Advanced Science Primary 3 Diversity

Sara tried to scratch a plastic ruler with a metal key and noticed a scratch mark on the ruler. This shows that __________.

A the ruler is harder than the key
B the key is harder than the ruler
C the ruler is stronger than the key
D the key is more flexible than the ruler
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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