Lesson 4: Heat transfer

1. What happened to the candle after heating?

• A. It remains the same

• B. It becomes ashes and smoke

• C. it becomes liquid wax

• D. it becomes solid decorative candle

2. What happened to the state of matter when candle is heated?

• A. Solid become liquid

• B. Liquid become gas

• C. Solid become gas

• D. It remains the same

3. What happened to liquid (water) when heated?

• A. It boiled

• B. It freeze

• C. it burnt

• D. It flows

4. It transfers heat through the molecules of solid materials.

• A. Convection

• B. Radiation

• C. Conduction

• D. Evaporation

5. Why in solid heat transfer faster than liquid?

• A. Because the molecules of solid are far to each other

• B. Because the molecules of solid are close to each other.

• C. Because the molecules of solid are slightly far with each other

• D. Because the molecules of solid are very small.