Corrosion and Rusting MCQs Class 8
Corrosion and Rusting – MCQs
Class: 8 | Subject: Science
Section 4: Materials – Metals and Non-Metals
Topic: Corrosion and Rusting
CBSE Board Examination Preparation
Section 4: Materials – Metals and Non-Metals
Topic: Corrosion and Rusting
CBSE Board Examination Preparation
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 Science examination standard.
1. Corrosion is the process of:
Answer: B
Corrosion is the slow deterioration of metals due to chemical reactions with the environment.
2. Rust is chemically:
Answer: A
Rust is hydrated iron(III) oxide formed when iron reacts with oxygen and water.
3. Rusting requires:
Answer: C
Both oxygen and moisture are essential for rust formation.
4. Which metal rusts?
Answer: B
Rusting specifically refers to corrosion of iron.
5. Rust is ______ in color.
Answer: B
The reddish-brown coating is hydrated iron oxide.
6. Galvanization protects iron by coating it with:
Answer: B
Zinc prevents iron from contacting air and moisture.
7. Painting iron prevents rusting because it:
Answer: B
Paint acts as a protective barrier.
8. Stainless steel resists corrosion due to:
Answer: B
Chromium forms a protective oxide layer.
9. Oil or grease prevents rusting by:
Answer: B
They prevent contact with air and water.
10. Corrosion leads to:
Answer: B
Corroded metals lose strength and durability.
11. Rusting is faster in:
Answer: B
Moisture accelerates rusting.
12. Copper corrosion forms:
Answer: B
Called patina (basic copper carbonate).
13. Anodizing protects:
Answer: B
Thick oxide layer prevents corrosion.
14. Rusting is a:
Answer: B
New substance forms.
15. Salt water rusts iron:
Answer: B
Salt increases conductivity of water.
16. Prevention method:
Answer: D
All block air/moisture.
17. Bridges use anti-corrosion coating to:
Answer: B
Prevents structural damage.
18. Food cans are tin-coated to prevent:
Answer: B
Tin resists corrosion.
19. Rusting is oxidation of:
Answer: A
Iron reacts with oxygen.
20. Best storage to prevent rust:
Answer: A
Dry conditions reduce moisture exposure.
