This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Physical And Chemical Changes > Class 7 Science Chapter 5 Physical And Chemical Changes – Quiz 17 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 17 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which type of property is the ability to conduct electricity? A) Physical property. B) Chemical property. C) All the above. D) None of the above. Show Answer Correct Answer: A) Physical property. 2. What is the first source of energy for all food webs? A) Sunlight. B) Plants. C) Decomposersers. D) Mineral in the soil. Show Answer Correct Answer: A) Sunlight. 3. What is the best way to separate a mixture of sugar, sand, and water? A) Freeze the mixture, causing the water to be destroyed, then sift the sugar from the sand. B) Filter the sand from the sugar and water, then heat the mixture, causing the water to evaporate. C) Filter the mixture, causing the sugar and sand to get caught but not the water. D) Stir the mixture, causing the water to move above the sugar and sand. Show Answer Correct Answer: B) Filter the sand from the sugar and water, then heat the mixture, causing the water to evaporate. 4. Chemical or Physical change?Fireworks exploding A) Chemical. B) Physical. C) All the above. D) None of the above. Show Answer Correct Answer: A) Chemical. 5. In a ..... change, a substance changes into a different substance. A) Physical. B) Chemical. C) All the above. D) None of the above. Show Answer Correct Answer: B) Chemical. 6. When two substances are mixed together but their properties do not change they are called a A) Mixture. B) Solution. C) Chemical change. D) None of the above. Show Answer Correct Answer: A) Mixture. 7. Soil erosion is a desirable change. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 8. What is the process of a solid changing directly into a gas called? A) Condensation. B) Evaporation. C) Melting. D) Sublimation. Show Answer Correct Answer: D) Sublimation. 9. The Law of Conservation of Mass states A) That matter exists in all states and reacts the same. B) That matter can only be changed into new substances by introducing a catalyst. C) That matter exists in the same state throughout any chemical change. D) That matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants. Show Answer Correct Answer: D) That matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants. 10. Chemical or Physical Change?Baking a cake A) Chemical. B) Physical. C) All the above. D) None of the above. Show Answer Correct Answer: A) Chemical. 11. When heat is removed from the water the molecules A) Nothing happens. B) Slow down and spread apart. C) Speed up and are close together. D) Slow down and come closer together. Show Answer Correct Answer: D) Slow down and come closer together. 12. Which of the following chemical formulas represents a compound? A) C$_{3}$. B) H$_{2}$. C) O$_{2}$. D) CH $ _ {3} $ for. Show Answer Correct Answer: D) CH $ _ {3} $ for. 13. Which of these is a clue that a chemical change is happening? A) Fizzing or bubbling. B) Color changes. C) Creation/loss of heat. D) All of these are clues that a chemical change is happening. Show Answer Correct Answer: D) All of these are clues that a chemical change is happening. 14. Which word demonstrates a chemical change? A) Burning. B) Evaporating. C) Melting. D) None of the above. Show Answer Correct Answer: A) Burning. 15. Every chemical change results in- A) A change in temperature. B) The formation of a new substance. C) The formation of a precipitate. D) A color change. Show Answer Correct Answer: B) The formation of a new substance. 16. Glass shatters on the ground. A) Physical change. B) Chemical change. C) All the above. D) None of the above. Show Answer Correct Answer: A) Physical change. 17. Hydrochloric acid in the stomach breaking down food is ..... A) Physical/mechanical. B) Chemical. C) All the above. D) None of the above. Show Answer Correct Answer: B) Chemical. 18. Which of the examples is a physical change that takes place in our mouth in the digestion process. A) Saliva helps break down food into simple sugars. B) Grinding food breaks down food into smaller pieces. C) All the above. D) None of the above. Show Answer Correct Answer: B) Grinding food breaks down food into smaller pieces. 19. A ..... the appearance or form of the matter changes but the kind of matter in the substance does not A) Physical change. B) Chemical change. C) Amino acid. D) Combustion. Show Answer Correct Answer: A) Physical change. 20. The temperature of ice is below 0'C (celsius) and it is a SOLID. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 21. A chemical reaction in which magnesium ribbon burns can be represented as A) Magnesium + Oxygen + Water$\rightarrow$ Magnesium hydroxide. B) Magnesium + Oxygen $\rightarrow$ Magnesium oxide. C) Magnesium + Oxygen $\rightarrow$ Magnesium hydroxide. D) Magnesium + Water $\rightarrow$ Magnesium hydroxide. Show Answer Correct Answer: B) Magnesium + Oxygen $\rightarrow$ Magnesium oxide. 22. To change from one state of matter to another state of matter is called? A) Kinetic change. B) Thermal change. C) Phase change. D) Potential change. Show Answer Correct Answer: C) Phase change. 23. The amount of matter in an object, measured in grams or kilograms. It's different from weight in which gravity does not affect it. Gravity affects weight. A) Matter. B) Volume. C) Solubility. D) Mass. Show Answer Correct Answer: D) Mass. 24. During Chemical Reactions, the substances that are used are called? A) Reactants. B) Corrosion. C) Products. D) Precipitate. Show Answer Correct Answer: A) Reactants. 25. Which is the definition of volume? A) The amount of matter an object contains. B) Length X width X height. C) A measure of the amount of space an object takes up. D) None of the above. Show Answer Correct Answer: C) A measure of the amount of space an object takes up. 26. Baking a cupcake A) Physcial change. B) Chemical change. C) All the above. D) None of the above. Show Answer Correct Answer: B) Chemical change. 27. Oxygen is an example of A) Element. B) Homogeneous mixture. C) Compound. D) Heterogeneous mixture. Show Answer Correct Answer: A) Element. 28. When iron is combined with oxygen in water, rust is formed A) The oxygen and iron are solutions. B) The oxygen and iron are mixtures. C) The oxygen and iron are reactants. D) The oxygen and iron are products. Show Answer Correct Answer: C) The oxygen and iron are reactants. 29. Galvanization is the process in which A) Iron is coated on zinc metal. B) Zinc and iron are mixed in molten state. C) Zinc is coated as a layer on iron. D) Carbon is mixed with iron and heated. Show Answer Correct Answer: C) Zinc is coated as a layer on iron. 30. Scenario:Water evaporates when heated. Does a chemical or physical change occur? A) No change. B) Physical change. C) Chemical change. D) Change in state. Show Answer Correct Answer: B) Physical change. ← PreviousRelated QuizzesScience QuizzesClass 7 QuizzesClass 7 Science Chapter 5 Physical And Chemical Changes Quiz 1Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 2Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 3Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 4Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 5Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 6Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 7Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books