Changes Around Us – CBSE Class 6 Science MCQs
Changes Around Us – CBSE Class 6 Science MCQs
Class: 6
Subject: Science
Section: Changes Around Us
Topic: Changes Around Us
Board: CBSE (Based on NCERT Syllabus)
Subject: Science
Section: Changes Around Us
Topic: Changes Around Us
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 a detailed explanation for better concept clarity.
1. Which of the following is an example of a change?
Answer: D. All of these
A change refers to any alteration in shape, size, state, or nature. Growth, melting, and burning all represent different kinds of changes.
A change refers to any alteration in shape, size, state, or nature. Growth, melting, and burning all represent different kinds of changes.
2. Which change is reversible?
Answer: C. Melting butter
Reversible changes can be undone. Melted butter can solidify again on cooling.
Reversible changes can be undone. Melted butter can solidify again on cooling.
3. Which is an irreversible change?
Answer: B. Breaking glass
Irreversible changes cannot be undone. Broken glass cannot be restored to its original form.
Irreversible changes cannot be undone. Broken glass cannot be restored to its original form.
4. Changes that occur again and again are called:
Answer: A. Periodic changes
Periodic changes repeat at regular intervals, such as day and night.
Periodic changes repeat at regular intervals, such as day and night.
5. Rusting of iron is a:
Answer: B. Slow change
Rusting takes place gradually when iron reacts with oxygen and moisture.
Rusting takes place gradually when iron reacts with oxygen and moisture.
6. Which is a fast change?
Answer: C. Burning matchstick
Fast changes occur quickly. A matchstick burns within seconds.
Fast changes occur quickly. A matchstick burns within seconds.
7. Expansion due to heating is usually:
Answer: B. Reversible
Most materials contract back on cooling, making expansion reversible.
Most materials contract back on cooling, making expansion reversible.
8. Cooking food is a:
Answer: B. Irreversible change
Once cooked, food cannot return to its raw state.
Once cooked, food cannot return to its raw state.
9. Which is a periodic change?
Answer: B. Seasons
Seasons repeat every year at regular intervals.
Seasons repeat every year at regular intervals.
10. Melting of ice is a:
Answer: C. Reversible physical change
Ice can refreeze into water again without forming a new substance.
Ice can refreeze into water again without forming a new substance.
11. Which change forms a new substance?
Answer: B. Burning wood
Burning produces ash and gases — new substances.
Burning produces ash and gases — new substances.
12. Physical changes affect:
Answer: C. Shape or state
Physical changes alter form but not substance composition.
Physical changes alter form but not substance composition.
13. Chemical changes are usually:
Answer: C. Irreversible
They produce new substances and cannot be undone easily.
They produce new substances and cannot be undone easily.
14. Which is NOT a slow change?
Answer: C. Burning candle
Burning occurs relatively fast compared to rusting or growth.
Burning occurs relatively fast compared to rusting or growth.
15. Day and night is due to:
Answer: B. Rotation
Earth’s rotation causes periodic change of day and night.
Earth’s rotation causes periodic change of day and night.
16. Cutting hair is a:
Answer: B. Irreversible change
Once cut, hair cannot reattach naturally.
Once cut, hair cannot reattach naturally.
17. Which involves contraction?
Answer: A. Cooling metals
Most materials contract when cooled.
Most materials contract when cooled.
18. Inflating a balloon is:
Answer: C. Reversible
Air can be released to restore original size.
Air can be released to restore original size.
19. Which is a natural change?
Answer: C. Flower blooming
It occurs naturally without human intervention.
It occurs naturally without human intervention.
20. Expansion of railway tracks in summer is due to:
Answer: B. Heating
Metals expand on heating, so gaps are left between tracks.
Metals expand on heating, so gaps are left between tracks.
