⚙️ Materials: Metals and Non-Metals – MCQs for Class 8 Science

Part 2: Q26 – Q50

Q26. Which of these metals is the most malleable?

A) Aluminium
B) Gold
C) Iron
D) Zinc

✅ Correct Answer: B) Gold

Explanation:

• A) Aluminium – Malleable but less than gold.
• B) Gold – ✔ Most malleable metal, can be beaten into very thin sheets.
• C) Iron – Malleable but not the most.
• D) Zinc – Comparatively brittle.

Q27. Which metal is used in making electric wires?

A) Iron
B) Zinc
C) Copper
D) Aluminium

✅ Correct Answer: C) Copper

Explanation:

• A) Iron – Conducts but corrodes.
• B) Zinc – Poor conductor compared to copper.
• C) Copper – ✔ Excellent conductor, ductile → wires.
• D) Aluminium – Used in wires but less than copper.

Q28. Which of these non-metals is a good conductor of electricity?

A) Sulphur
B) Graphite
C) Phosphorus
D) Bromine

✅ Correct Answer: B) Graphite

Explanation:

• A) Sulphur – Non-conductor.
• B) Graphite – ✔ Allotrope of carbon, conducts electricity.
• C) Phosphorus – Non-conductor.
• D) Bromine – Non-conductor.

Q29. Which gas is produced when non-metals react with oxygen?

A) Hydrogen
B) Nitrogen oxides
C) Non-metallic oxides
D) Carbon monoxide only

✅ Correct Answer: C) Non-metallic oxides

Explanation:

• A) Hydrogen – Not formed.
• B) Nitrogen oxides – Example of non-metal oxides, but not general.
• C) Non-metallic oxides – ✔ General product (e.g., CO₂, SO₂).
• D) Carbon monoxide only – Only specific case of incomplete combustion.

Q30. Which property distinguishes metals from non-metals?

A) Conductivity
B) Colour
C) Density
D) Taste

✅ Correct Answer: A) Conductivity

Explanation:

• A) Conductivity – ✔ Metals conduct heat/electricity, non-metals do not.
• B) Colour – Not reliable, many exceptions.
• C) Density – Some metals are light, some heavy.
• D) Taste – Not a safe/valid property.

Q31. Which of these metals does NOT react with water at all?

A) Calcium
B) Sodium
C) Magnesium
D) Gold

✅ Correct Answer: D) Gold

Explanation:

• A) Calcium – Reacts slowly with water.
• B) Sodium – Reacts vigorously with water.
• C) Magnesium – Reacts slowly with hot water.
• D) Gold – ✔ Noble metal, does not react.

Q32. Which metal is the best conductor of heat?

A) Silver
B) Iron
C) Aluminium
D) Copper

✅ Correct Answer: A) Silver

Explanation:

• A) Silver – ✔ Best conductor of heat.
• B) Iron – Lesser conductor.
• C) Aluminium – Good conductor but not the best.
• D) Copper – Very good, but below silver.

Q33. Which non-metal is essential for making proteins?

A) Sulphur
B) Phosphorus
C) Nitrogen
D) Chlorine

✅ Correct Answer: C) Nitrogen

Explanation:

• A) Sulphur – Present in some amino acids, not main.
• B) Phosphorus – Bones and DNA, not protein.
• C) Nitrogen – ✔ Essential for proteins, amino acids.
• D) Chlorine – Disinfectant, not protein.

Q34. Which of these metals is used in making cooking utensils?

A) Iron
B) Aluminium
C) Copper
D) All of these

✅ Correct Answer: D) All of these

Explanation:

• A) Iron – ✔ Used for tavas/pans.
• B) Aluminium – ✔ Light, conducts heat.
• C) Copper – ✔ Good conductor, used in vessels.
• D) All of these – ✔ Correct, all are used.

Q35. Which gas is produced when metals react with acids?

A) Oxygen
B) Hydrogen
C) Carbon dioxide
D) Nitrogen

✅ Correct Answer: B) Hydrogen

Explanation:

• A) Oxygen – Not formed.
• B) Hydrogen – ✔ Metal + acid → salt + hydrogen.
• C) Carbon dioxide – Carbonates produce CO₂, not metals.
• D) Nitrogen – Not formed.

Q36. Which of the following is the least reactive metal?

A) Zinc
B) Silver
C) Gold
D) Iron

✅ Correct Answer: C) Gold

Explanation:

• A) Zinc – Reactive with acids.
• B) Silver – Less reactive, but tarnishes.
• C) Gold – ✔ Least reactive, does not corrode.
• D) Iron – Reacts with air and water (rusts).

Q37. Which non-metal is used in the manufacture of fertilizers?

A) Nitrogen
B) Phosphorus
C) Both A and B
D) Sulphur

✅ Correct Answer: C) Both A and B

Explanation:

• A) Nitrogen – Used in urea, ammonium salts.
• B) Phosphorus – Used in superphosphates.
• C) Both A and B – ✔ Correct, both are essential.
• D) Sulphur – Not a major fertilizer component.

Q38. Which metal is used in making ornaments other than gold?

A) Zinc
B) Aluminium
C) Silver
D) Lead

✅ Correct Answer: C) Silver

Explanation:

• A) Zinc – Not used in ornaments.
• B) Aluminium – Used industrially.
• C) Silver – ✔ Common jewellery metal.
• D) Lead – Toxic.

Q39. Which property of metals allows them to produce a ringing sound?

A) Malleability
B) Sonority
C) Conductivity
D) Ductility

✅ Correct Answer: B) Sonority

Explanation:

• A) Malleability – Sheet making.
• B) Sonority – ✔ Metals produce ringing sound when struck.
• C) Conductivity – Heat/electricity.
• D) Ductility – Wire formation.

Q40. Which metal is used for making galvanised iron?

A) Zinc
B) Copper
C) Aluminium
D) Lead

✅ Correct Answer: A) Zinc

Explanation:

• A) Zinc – ✔ Coating prevents rusting of iron.
• B) Copper – Not used for galvanisation.
• C) Aluminium – Forms oxide layer naturally.
• D) Lead – Not used.

Q41. Which of the following is NOT a property of metals?

A) Malleable
B) Ductile
C) Good conductor
D) Brittle

✅ Correct Answer: D) Brittle

Explanation:

• A, B, C – True properties of metals.
• D) Brittle – ✔ Property of non-metals, not metals.

Q42. Which non-metal is used in vulcanisation of rubber?

A) Chlorine
B) Sulphur
C) Iodine
D) Carbon

✅ Correct Answer: B) Sulphur

Explanation:

• A) Chlorine – Disinfectant.
• B) Sulphur – ✔ Vulcanisation strengthens rubber.
• C) Iodine – Antiseptic.
• D) Carbon – Not used here.

Q43. Which metal is used in thermometers and barometers?

A) Iron
B) Copper
C) Mercury
D) Aluminium

✅ Correct Answer: C) Mercury

Explanation:

• A, B, D – Not liquids.
• C) Mercury – ✔ Liquid metal, expands uniformly.

Q44. Which non-metal is used in making explosives?

A) Nitrogen
B) Phosphorus
C) Sulphur
D) All of these

✅ Correct Answer: D) All of these

Explanation:

• A) Nitrogen – Used in TNT, RDX.
• B) Phosphorus – Used in fireworks, explosives.
• C) Sulphur – Gunpowder.
• D) All of these – ✔ Correct.

Q45. Which property makes aluminium suitable for food packaging?

A) Heavy
B) Corrosion resistant
C) Transparent
D) Magnetic

✅ Correct Answer: B) Corrosion resistant

Explanation:

• A) Heavy – False, it’s light.
• B) Corrosion resistant – ✔ Forms oxide layer, safe for food.
• C) Transparent – Not true.
• D) Magnetic – Aluminium is non-magnetic.

Q46. Which gas is produced when sulphur reacts with oxygen?

A) CO₂
B) SO₂
C) NO₂
D) H₂

✅ Correct Answer: B) SO₂

Explanation:

• A) CO₂ – Carbon reaction.
• B) SO₂ – ✔ Sulphur dioxide, choking smell.
• C) NO₂ – Nitrogen reaction.
• D) H₂ – Not formed.

Q47. Which of these metals is used in making batteries?

A) Zinc
B) Lead
C) Both A and B
D) Silver

✅ Correct Answer: C) Both A and B

Explanation:

• A) Zinc – Used in dry cells.
• B) Lead – Lead-acid batteries.
• C) Both A and B – ✔ Correct.
• D) Silver – Not common.

Q48. Which of the following is used for making pencil lead?

A) Diamond
B) Graphite
C) Sulphur
D) Phosphorus

✅ Correct Answer: B) Graphite

Explanation:

• A) Diamond – Hardest carbon form.
• B) Graphite – ✔ Conductive, soft, used in pencils.
• C) Sulphur – Matchsticks.
• D) Phosphorus – Matchsticks.

Q49. Which non-metal is used in making antiseptic solutions?

A) Bromine
B) Sulphur
C) Iodine
D) Oxygen

✅ Correct Answer: C) Iodine

Explanation:

• A) Bromine – Not antiseptic.
• B) Sulphur – Not antiseptic.
• C) Iodine – ✔ Used as tincture iodine.
• D) Oxygen – Needed for respiration, not antiseptic.

Q50. Which non-metal is used in making fire extinguishers?

A) Nitrogen
B) Sulphur dioxide
C) Carbon dioxide
D) Chlorine

✅ Correct Answer: C) Carbon dioxide

Explanation:

• A) Nitrogen – Inert gas, not used.
• B) SO₂ – Poisonous.
• C) CO₂ – ✔ Puts out fire by cutting oxygen supply.
• D) Chlorine – Disinfectant, not extinguisher.

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