G7 ELIMINATION QUIZ

1. 1. Which of the following is an example of a synthetic material?

• A. Wood

• B. Cotton

• C. Plastic

• D. Sand

2 .Why are metals often used for making electrical wires?

• A. Brittle

• B. Conductors of electricity

• C. Poor conductors of heat

• D. Transparent

3. Which property of glass makes it useful for making windows?

• A. Flexibility

• B. Transparency

• C. Conductivity

• D. Magnetism

4. Which statement BEST describes a mixture?

• A. A substance with only one type of atom.

• B. A substance that cannot be broken down.

• C. A physical combination of two or more substances.

• D. A chemical combination that cannot be separated.

5. Why do scientists use models?

• A. To avoid experiments.

• B. To replace real objects permanently.

• C. To explain and predict phenomena.

• D. To make experiments harder.

6. The Bohr model of the atom is an example of what scientific model?

• A. A chemical reaction

• B. A scientific theory

• C. A physical law

• D. A scientific model

7. Which of the following is a limitation of scientific models?

• A. They always explain reality exactly.

• B. They can be updated when new evidence is found.

• C. They are impossible to use.

• D. They never change.

8. In the particle model, how are the particles in solid arranged?

• A. Far apart and moving freely.

• B. Close together and vibrating in place.

• C. Randomly spread out.

• D. Not moving at all.

9. Which change of state happens when water vapor becomes liquid?

• A. Melting

• B. Freezing

• C. Condensation

• D. Evaporation

10. When ice melts, what happens to the particles?

• A. Break apart into atoms.

• B. Move faster and slide past each other.

• C. Stop moving.

• D. Get closer together.