Standard Science Primary 3 Diversity

Ravi tried to scratch a plastic ruler with a metal key. He found that the key left a scratch on the ruler. This shows that __________.

A the plastic ruler is stronger than the metal key
B the plastic ruler is harder than the metal key
C the metal key is more flexible than the plastic ruler
D the metal key is harder than the plastic ruler
Show Worked Solution

Worked Solution

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

Correct answer: the metal key is harder than the plastic ruler

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