7. What happens to particles in a liquid when it boils? A) They get closer together B) They stay the same C) They spread far apart D) They freeze x Evaporation occurs at A) Only at boiling point B) All temperatures C) Only in sunlight D) Only in cold weather 9. Which spoon would be a poor choice for stirring hot soup? A) Metal spoon B) Wooden spoon C) Plastic spoon D) Glass spoon 10. What is an electrical conductor? A) A substance that absorbs electricity B) A substance that allows electricity to flow C) A substance that blocks electricity D) A substance that stores electricity 1. What role does air play in keeping us warm when wearing a woollen j A) Air is a thermal conductor B) Air traps heat C) Air cools the body D) Air has no effect 2. What type of material is used for the handles of electric irons? A) Metal B) Plastic C) Wood D) Rubber 3. What is one example of a thermal conductor? A) Plastic B) Rubber C) Iron D) Wood

Here are the answers and explanations for the questions:**7. What happens to particles in a liquid when it boils?****Answer: C) They spread far apart****Explanation:** When a liquid boils, the particles gain enough energy to overcome the forces holding them together. They move faster and farther apart, transitioning from a liquid state to a gaseous state.**x Evaporation occurs at****Answer: B) All temperatures****Explanation:** Evaporation is a continuous process that occurs at all temperatures. While it happens faster at higher temperatures, even at room temperature, some liquid molecules have enough energy to escape into the air.**9. Which spoon would be a poor choice for stirring hot soup?****Answer: C) Plastic spoon****Explanation:** Plastic is a poor conductor of heat. It would melt or deform when exposed to hot soup. Metal, wood, and glass are better choices as they can withstand higher temperatures.**10. What is an electrical conductor?****Answer: B) A substance that allows electricity to flow****Explanation:** An electrical conductor is a material that allows electricity to pass through it easily. Examples include metals like copper and silver.**1. What role does air play in keeping us warm when wearing a woollen jacket?****Answer: B) Air traps heat****Explanation:** Wool fibers create tiny pockets of air. This trapped air acts as an insulator, preventing heat from escaping our bodies and keeping us warm.**2. What type of material is used for the handles of electric irons?****Answer: D) Rubber****Explanation:** Rubber is a good insulator and prevents heat from transferring to the handle, making it safe to hold.**3. What is one example of a thermal conductor?****Answer: C) Iron****Explanation:** Iron is a good conductor of heat. It allows heat to transfer through it easily, making it suitable for applications like cooking utensils and radiators.