What happens to the particles in a material when it is heated?

• A) They slow down

• B) They gain energy and move faster

• C) They disappear

• D) They change color

Which of the following materials expands when heated?

• A) Ice

• B) Glass

• C) Metal

• D) Rubber

What is the process called when water turns into steam?

• A) Freezing

• B) Melting

• C) Evaporation

• D) Condensation

Why do bridges have gaps between sections?

• A) To hold them up

• B) To allow for expansion during hot weather

• C) To make them look nice

• D) To prevent cars from driving over them

What happens to a metal ball when it is cooled?

• A) It expands

• B) It disappears

• C) It contracts

• D) It changes color

At what temperature does water freeze?

• A) 0°C

• B) 32°C

• C) 100°C

• D) 50°C

How does cooling affect the growth of bacteria in food?

• A) It speeds it up

• B) It has no effect

• C) It slows it down

• D) It causes food to rot

Why is it important for engineers to understand how materials react to temperature changes?

• A) To make materials more colorful

• B) To design safe buildings and bridges

• C) To create new materials

• D) To reduce costs

What is one effect of heating dough while baking?

• A) It freezes

• B) It becomes hard

• C) It rises and becomes fluffy

• D) It turns into liquid

What is a practical application of cooling materials?

• A) Cooking food

• B) Creating ice for drinks

• C) Making metals expand

• D) Painting surfaces