Physical and Chemical Changes MCQs Class 7
Physical and Chemical Changes – MCQs with Answers & Explanations
Class: 7 | Subject: Science | Section: Physical & Chemical Changes | Topic: Physical and Chemical Changes MCQs Class 7
Based on NCERT Syllabus | CBSE Board Examination Pattern
Based on NCERT Syllabus | CBSE Board Examination Pattern
1. A change in which no new substance is formed is called:
Answer: B. Physical change
No new substance forms; only shape, size or state changes.
No new substance forms; only shape, size or state changes.
2. Melting of ice is a:
Answer: B. Ice can refreeze, so the change is physical and reversible.
3. Rusting of iron is a:
Answer: B. A new substance (iron oxide) forms.
4. Burning of paper produces:
Answer: B. Ash and gases form, proving chemical change.
5. Dissolving sugar in water is:
Answer: B. Sugar can be recovered by evaporation.
6. Which is irreversible?
Answer: A. Torn paper cannot return to original form.
7. Formation of curd from milk is:
Answer: B. New substance forms and cannot revert.
8. Cutting wood is a:
Answer: B. Only size/shape changes.
9. Burning magnesium ribbon forms:
Answer: A. White ash magnesium oxide forms.
10. Chemical changes are usually:
Answer: B. They form new substances permanently.
11. Expansion of metals on heating is:
Answer: B. No new substance forms.
12. Photosynthesis is a:
Answer: B. New substances (glucose, oxygen) form.
13. Which indicates chemical change?
Answer: B. Gas evolution shows new substance.
14. Which is a physical change?
Answer: C. Only state changes.
15. Cooking food is:
Answer: B. New substances with new taste form.
16. Freezing of water is reversible because:
Answer: B. Ice can melt back to water.
17. Formation of crystals from solution is:
Answer: B. Substance remains same.
18. Which produces heat and light?
Answer: B. Combustion releases energy.
19. Galvanization prevents:
Answer: B. Zinc coating protects iron.
20. Chemical changes are useful because they:
Answer: A. They create new materials for use.