Class 6 Science Physical and Chemical Changes MCQs
Physical and Chemical Changes – CBSE Class 6 Science MCQs
Class: 6
Subject: Science
Section: Changes Around Us
Topic: Physical and Chemical Changes
Board: CBSE (Based on NCERT Syllabus)
Subject: Science
Section: Changes Around Us
Topic: Physical and Chemical Changes
Board: CBSE (Based on NCERT Syllabus)
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 6 Science examination preparation. Each question includes easy and concept‑clearing explanations.
1. A physical change affects only the:
Answer: B. Shape or size
Physical changes alter form or state but no new substance is formed.
Physical changes alter form or state but no new substance is formed.
2. Which is a physical change?
Answer: C. Melting ice
Ice changes from solid to liquid without forming a new substance.
Ice changes from solid to liquid without forming a new substance.
3. Chemical changes produce:
Answer: B. New substance
Chemical reactions create materials with new properties.
Chemical reactions create materials with new properties.
4. Rusting of iron is a:
Answer: B. Chemical change
Iron reacts with oxygen forming iron oxide (rust).
Iron reacts with oxygen forming iron oxide (rust).
5. Which change is reversible?
Answer: C. Freezing water
Water can melt and refreeze repeatedly.
Water can melt and refreeze repeatedly.
6. Burning wood is:
Answer: B. Chemical
It forms ash, smoke, and gases — new substances.
It forms ash, smoke, and gases — new substances.
7. Dissolving sugar in water is a:
Answer: B. Physical change
Sugar can be recovered by evaporation.
Sugar can be recovered by evaporation.
8. Which indicates a chemical change?
Answer: B. Formation of gas
Gas formation often signals a chemical reaction.
Gas formation often signals a chemical reaction.
9. Curd formation from milk is:
Answer: B. Chemical
Bacteria convert milk into curd — a new substance.
Bacteria convert milk into curd — a new substance.
10. Cutting vegetables is a:
Answer: B. Physical
Only size changes, not composition.
Only size changes, not composition.
11. Which is NOT a chemical change?
Answer: C. Melting wax
No new substance forms during melting.
No new substance forms during melting.
12. Explosion of firecrackers is:
Answer: B. Chemical
It produces heat, light, sound, and gases.
It produces heat, light, sound, and gases.
13. Which change involves energy release?
Answer: A. Burning fuel
Chemical reactions often release heat and light.
Chemical reactions often release heat and light.
14. Formation of new color may indicate:
Answer: B. Chemical change
Color change often signals new substance formation.
Color change often signals new substance formation.
15. Boiling water is:
Answer: B. Physical
Water vapor can condense back to liquid.
Water vapor can condense back to liquid.
16. Digestion of food is:
Answer: B. Chemical
Food converts into new absorbable substances.
Food converts into new absorbable substances.
17. Which is reversible?
Answer: C. Folding paper
Paper can be unfolded back.
Paper can be unfolded back.
18. Chemical changes are usually:
Answer: C. Permanent
They form new substances difficult to reverse.
They form new substances difficult to reverse.
19. Which is a physical change?
Answer: C. Breaking chalk
No new substance forms.
No new substance forms.
20. Formation of ash indicates:
Answer: B. Chemical change
Ash is a completely new substance formed after burning.
Ash is a completely new substance formed after burning.