Standard Science Primary 3 Diversity

Sara used a plastic ruler to scratch a wooden desk. She noticed a scratch mark on the ruler but not on the desk. This shows that __________.

A the plastic ruler is harder than the wooden desk
B the wooden desk is stronger than the plastic ruler
C the plastic ruler is stronger than the wooden desk
D the wooden desk is harder than the plastic ruler
Show Worked Solution

Worked Solution

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

Correct answer: the wooden desk is harder than the plastic ruler

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