Understanding Hardness of Materials

Which of the following materials was NOT used in the experiment?

• A plastic bottle

• A metal spoon

• A rubber eraser

• A piece of paper

What does the hardness of a material describe?

• Its ability to conduct electricity

• Its color and texture

• Its resistance to scratching and deformation

• Its weight and density

How can the hardness of materials be tested?

• By heating them

• By measuring their weight

• By observing their color change

• By rubbing them against each other

Which material was NOT scratched by the nail in the experiment?

• Soap

• Glass

• Cardboard

• Wood

What happens when a stronger object is rubbed against a weaker one?

• Neither object gets scratched

• The weaker object gets scratched

• The stronger object gets more scratches

• Both objects get scratched equally