Materials: Metals and Non-Metals Part 2: MCQs (Q26–Q50)
⚙️ 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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