Standard Science Primary 3 Diversity

A plastic ruler can scratch a wooden table, but it cannot scratch a glass window. Which statement is correct?

A Plastic is harder than glass.
B Wood is harder than plastic.
C Wood is the hardest material.
D Glass is harder than plastic.
Show Worked Solution

Worked Solution

Step 1: A harder material scratches a softer material. Step 2: Plastic scratched wood (Plastic > Wood). Step 3: Plastic could NOT scratch glass (Glass > Plastic).

Correct answer: Glass is harder than plastic.

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free