Grade 7 Science Subject

Conduction, Convection, and Radiation Subject Topic

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Directions: Choose the letter of the correct answer and write it on your answer sheet. 1. How does heat transfer happen when you touch an ice cube? a. Heat flows from your finger to the ice cube. b. Heat energy flows in both directions. c. Heat flows from the ice cube to your finger. d. Heat energy does not flow at all. 2. Your sister is cooking champorado what mode of heat transfer is involved in this situation? a. Convection b. Conduction C. Radiation d. None of the above 3. In the situation stated in item number 2, in what direction does heat travel?| a. From bottom to top b. From top to bottom C. Both a and b d. None of these 4. Heat transfer by convection occurs in what phase/s of matter? a. Liquid and gas b. Solid and liquid c. Solid and gas d. Solid, liquid and gas 5. Why do you think it is advisable to use kitchen utensil with wooden handle? a. Wood is a good conductor. b. Wood is cheaper than metals. c. Wood is a good insulator. d. Wooden handles are sturdy.6. Why is the inside of thermos bottle silver? a. It allows conduction of heat. b. It allows convection to occur. c. The color reflects heat; therefore, it maintains the heat inside the bottle. d. The color absorbs heat; therefore, it maintains the heat inside the bottle. 7. The tile floor feels cold to the bare feet while the carpet at the same room temperature feels warm. Why? a. Tile is a poor conductor of heat. b. Carpet floor is better conductor of heat than the tile floor. C. Tile is a better insulator of heat than carpet. d. Tile is better conductor of heat than carpet. 8. Heat is the transfer of from one object to another due to a difference in temperature. a. velocity c. energy b. time d. force 9. Which of the following is not a good conductor of heat? a. a steel pan c. copper wire b. a blanket d. an iron rod 10. Which of the following is the right direction of the flow of heat? a. Heat flows at equal temperature b. Heat flows from high temperature to low temperature. C. Heat flows from normal temperature to high temperature. d. Heat flows from low temperature to high temperature.Directions: Read the following statements and determine which mode of heat transfer each statement describes. Write CD for conduction, CV for convection and R for radiation. 1. Hair gets hot when a hair straightener is used on it. 2. A heater inside the hot air balloon heats the air and the hot air moves upward. 3. In a house, the heat rises to the attic. 4. An ice cube melts when you hold it in your hand. 5. Sunbathing on the beach during summer. 6. Touching a metal spoon that has been in boiling water. 7. Holding a hot water bottle to keep you warm. 8. When ironing, heat is transferred from the iron to the garment. 9. Reheating fried chicken using a microwave oven. 10. Boiling water, where cold water starts to sink and the warm water rises