This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 5 Physical And Chemical Changes – Quiz 25 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 25 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Stainless steel is made by mixing iron with carbon and metals like ..... A) Chromium. B) Nickel. C) Manganese. D) All of the above. Show Answer Correct Answer: D) All of the above. 2. When baking a cake, the process of mixing the ingredients and heating them in an oven A) Changes the physical properties of the mixture, but does not create a new substance. B) Creates a new substance and cannot be undone. C) All the above. D) None of the above. Show Answer Correct Answer: B) Creates a new substance and cannot be undone. 3. In which of the following actions does a physical change occur to separate a mixture? A) Stirring chocolate syrup into milk. B) Evaporating water from salt water. C) Freezing a solution of water and sugar. D) Adding sand to a beaker of water. Show Answer Correct Answer: B) Evaporating water from salt water. 4. When molecules are barely moving and all stuck in one spot, they are what? A) Solid. B) Liquid. C) Gas. D) None of the above. Show Answer Correct Answer: A) Solid. 5. Which example best illustrates a physical change? A) Iron rusting. B) Charcoal burning. C) An ice cube melting. D) A marshmallow burning. Show Answer Correct Answer: C) An ice cube melting. 6. If you dissolve Kool-Aid crystals in water and then boil the water until it evaporates, ..... will be left behind. A) Nothing. B) Kool-Aid crystals. C) All the above. D) None of the above. Show Answer Correct Answer: B) Kool-Aid crystals. 7. Spoiling food is an example of: A) Chemical change. B) Physical change. C) No change. D) None of the above. Show Answer Correct Answer: A) Chemical change. 8. Both physical and chemical changes affect matter, but physical changes are ..... and chemical changes are ..... A) Reversible, irreversible. B) Permanent, reversible. C) Irreversible, reversible. D) Irreversible, permanent. Show Answer Correct Answer: A) Reversible, irreversible. 9. A chemical change is different than a physical change because in a chemical change A) Chemicals are used. B) Molecules do not physically touch. C) A new substance is formed and in a physical change no new substance is formed. D) The change can be seen but in a physical change it cannot. Show Answer Correct Answer: C) A new substance is formed and in a physical change no new substance is formed. 10. Rusting occurs when iron comes in contact with A) Only moisture/water. B) Only oxygen from air. C) Both oxygen and moisture/water. D) Neither oxygen nor water. Show Answer Correct Answer: C) Both oxygen and moisture/water. 11. The process by which we can obtain large crystals of pure substances from their solutions A) Galvanization. B) Rusting. C) Crystallisation. D) Photosynthesis. Show Answer Correct Answer: C) Crystallisation. 12. Identify the correct answer. To prepare dosa batter, rice and dal should be soaked for 4 hours and grinde it.Above process is A) Physical change and Reversible. B) Physical change and Irreversible. C) Chemical change and Reversible. D) Chemical change and Irreversible. Show Answer Correct Answer: B) Physical change and Irreversible. 13. Which of the following is/are true when milk changes to curd?(i) Its state is changed from liquid to semi solid(ii) It changes color(iii) It changes taste(iv) The change cannot be reversed. Choose the correct option from the ones given below: A) (i) and (ii) are correct. B) (ii) and (iii) are correct. C) (i), (iii) and (iv) are correct. D) All are correct. Show Answer Correct Answer: C) (i), (iii) and (iv) are correct. 14. The contractions that push food down your oesophagus are known as? A) Chemical Digestion. B) Mucus. C) Peristalsis. D) Flexion. Show Answer Correct Answer: C) Peristalsis. 15. What kind of properties can only be observed when a substance changes into a new substance? A) Physical properties. B) Chemical properties. C) Liquid properties. D) Real properties. Show Answer Correct Answer: B) Chemical properties. 16. Which is not a sign that a chemical reaction has occurred. A) A change in mass. B) Bubbling. C) Production of an odor or smell. D) Change in color. Show Answer Correct Answer: A) A change in mass. 17. Hydrogen and sulfur are combined in a chemical reaction. The product is A) Without any properties. B) A substance that looks different but has the same properties. C) A new substance with different properties. D) Sold by the Property Brothers. Show Answer Correct Answer: C) A new substance with different properties. 18. A substance that reacts with another during a chemical reaction A) Amino acid. B) Activation energy. C) Reactant. D) Combustion. Show Answer Correct Answer: C) Reactant. 19. Which is a physical change? A) Burning wood. B) Rusty nail. C) Freezing water. D) Baking cookies. Show Answer Correct Answer: C) Freezing water. 20. A bicycle rusting in the rain is a A) Physical change. B) Chemical change. C) All the above. D) None of the above. Show Answer Correct Answer: B) Chemical change. 21. Melting is a chemical change A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 22. Which of the following is/are true when milk changes into curd? (i) Its state is changed from liquid to semi solid. (ii) It changes colour. (iii) It changes taste. (iv) The change cannot be reversedChoose the correct option from below: A) (i) and (ii) are correct. B) (ii) and (iii) are correct. C) (i), (iii) and (iv) are correct. D) (i) to (iv) are correct. Show Answer Correct Answer: C) (i), (iii) and (iv) are correct. 23. During ..... , ..... convert radiant energy into the chemical energy in sugar molecules. A) Chemosynthesis, consumers. B) Chemosynthesis, producers. C) Photosynthesis, producers. D) None of the above. Show Answer Correct Answer: C) Photosynthesis, producers. 24. During an experiment, a student mixes two clear liquids and observes a color change. What type of change does this indicate? A) Physical change. B) Chemical change. C) No change. D) State change. Show Answer Correct Answer: B) Chemical change. 25. What will happen to water puddles outside if the temperature continues to go up throughout the day? A) The liquid water will evaporate into a gas. B) The liquid water will freeze into a solid. C) The gas will melt into liquid water. D) The solid will harden into a gas. Show Answer Correct Answer: A) The liquid water will evaporate into a gas. ← PreviousNext →Related 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 8Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 9Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books