Materials: Metals and Non-Metals Part 3: MCQs (Q51–Q75)
⚙️ Materials: Metals and Non-Metals – MCQs for Class 8 Science
Part 3: Q51 – Q75
Q51. Which of the following metals is the best conductor of electricity?
A) Copper
B) Silver
C) Aluminium
D) Iron
✅ Correct Answer: B) Silver
Explanation:
- A) Copper – Very good conductor but not the best.
- B) Silver – ✔ Best conductor of electricity.
- C) Aluminium – Good, cheaper than copper but less conductive.
- D) Iron – Conducts, but poorly compared to others.
Q52. Which non-metal is essential for combustion?
A) Nitrogen
B) Oxygen
C) Carbon
D) Sulphur
✅ Correct Answer: B) Oxygen
Explanation:
- A) Nitrogen – Inert, does not support burning.
- B) Oxygen – ✔ Supports combustion.
- C) Carbon – Burns but does not support burning.
- D) Sulphur – Burns, does not support combustion.
Q53. Which metal is used in making foils for food wrapping?
A) Copper
B) Aluminium
C) Zinc
D) Iron
✅ Correct Answer: B) Aluminium
Explanation:
- A) Copper – Toxic for food wrapping.
- B) Aluminium – ✔ Light, corrosion-resistant, used for foils.
- C) Zinc – Used in galvanisation.
- D) Iron – Heavy, rusts easily.
Q54. Which of these is an amphoteric oxide?
A) Aluminium oxide
B) Copper oxide
C) Calcium oxide
D) Sodium oxide
✅ Correct Answer: A) Aluminium oxide
Explanation:
- A) Aluminium oxide – ✔ Reacts with both acids and bases.
- B) Copper oxide – Basic oxide.
- C) Calcium oxide – Basic oxide.
- D) Sodium oxide – Strongly basic.
Q55. Which metal is most abundant in the Earth’s crust?
A) Iron
B) Aluminium
C) Calcium
D) Magnesium
✅ Correct Answer: B) Aluminium
Explanation:
- A) Iron – Abundant, but not the most.
- B) Aluminium – ✔ Most abundant metal in Earth’s crust.
- C) Calcium – Present, but not maximum.
- D) Magnesium – Also present but less.
Q56. Which non-metal is used in the manufacture of sulphuric acid?
A) Oxygen
B) Phosphorus
C) Sulphur
D) Carbon
✅ Correct Answer: C) Sulphur
Explanation:
- A) Oxygen – Used but not the main raw material.
- B) Phosphorus – Not used.
- C) Sulphur – ✔ Main raw material for H₂SO₄.
- D) Carbon – Not used in sulphuric acid production.
Q57. Which of the following metals is stored under kerosene oil?
A) Aluminium
B) Sodium
C) Copper
D) Iron
✅ Correct Answer: B) Sodium
Explanation:
- A) Aluminium – Stable in air.
- B) Sodium – ✔ Very reactive, kept in kerosene.
- C) Copper – Stable in air.
- D) Iron – Rusts slowly, no kerosene needed.
Q58. Which metal is the most ductile?
A) Silver
B) Iron
C) Gold
D) Copper
✅ Correct Answer: C) Gold
Explanation:
- A) Silver – Ductile but not the most.
- B) Iron – Ductile, but less.
- C) Gold – ✔ Most ductile metal, drawn into very thin wires.
- D) Copper – Also ductile, but below gold.
Q59. Which of these non-metals is lustrous?
A) Sulphur
B) Iodine
C) Phosphorus
D) Oxygen
✅ Correct Answer: B) Iodine
Explanation:
- A) Sulphur – Dull.
- B) Iodine – ✔ Shiny surface, exception among non-metals.
- C) Phosphorus – Dull.
- D) Oxygen – Gas, no lustre.
Q60. Which metal is used in thermometers?
A) Aluminium
B) Mercury
C) Copper
D) Iron
✅ Correct Answer: B) Mercury
Explanation:
- A) Aluminium – Solid, not suitable.
- B) Mercury – ✔ Liquid metal, expands uniformly, used in thermometers.
- C) Copper – Good conductor, not used in thermometers.
- D) Iron – Solid, not suitable.
Q61. Which of the following is the hardest substance?
A) Graphite
B) Iron
C) Diamond
D) Aluminium
✅ Correct Answer: C) Diamond
Explanation:
- A) Graphite – Soft, slippery.
- B) Iron – Hard but not the hardest.
- C) Diamond – ✔ Hardest natural substance.
- D) Aluminium – Soft metal.
Q62. Which metal is used in making railway tracks?
A) Aluminium
B) Iron
C) Copper
D) Zinc
✅ Correct Answer: B) Iron
Explanation:
- A) Aluminium – Light, not used.
- B) Iron – ✔ Strong, durable, used in tracks.
- C) Copper – Expensive.
- D) Zinc – Too brittle.
Q63. Which non-metal is used in fertilizers to promote root growth?
A) Carbon
B) Nitrogen
C) Phosphorus
D) Sulphur
✅ Correct Answer: C) Phosphorus
Explanation:
- A) Carbon – Not used.
- B) Nitrogen – Promotes leaf growth.
- C) Phosphorus – ✔ Promotes root development.
- D) Sulphur – Not main for root growth.
Q64. Which metal is used in galvanisation of iron?
A) Lead
B) Zinc
C) Aluminium
D) Copper
✅ Correct Answer: B) Zinc
Explanation:
- A) Lead – Toxic, not used.
- B) Zinc – ✔ Prevents rusting of iron.
- C) Aluminium – Protective oxide layer.
- D) Copper – Not used for galvanisation.
Q65. Which metal is used in making coins?
A) Copper
B) Aluminium
C) Nickel
D) All of these
✅ Correct Answer: D) All of these
Explanation:
- A) Copper – Used in old coins.
- B) Aluminium – Used in some coins.
- C) Nickel – Mixed in coins.
- D) All of these – ✔ Correct.
Q66. Which non-metal is used in making antiseptics?
A) Bromine
B) Iodine
C) Chlorine
D) Oxygen
✅ Correct Answer: B) Iodine
Explanation:
- A) Bromine – Toxic.
- B) Iodine – ✔ Used in tincture iodine.
- C) Chlorine – Disinfectant, not antiseptic.
- D) Oxygen – Not antiseptic.
Q67. Which metal is used in making aeroplanes?
A) Iron
B) Aluminium
C) Copper
D) Zinc
✅ Correct Answer: B) Aluminium
Explanation:
- A) Iron – Too heavy.
- B) Aluminium – ✔ Lightweight, strong.
- C) Copper – Expensive, not used for planes.
- D) Zinc – Brittle.
Q68. Which non-metal exists in various allotropic forms?
A) Carbon
B) Sulphur
C) Phosphorus
D) All of these
✅ Correct Answer: D) All of these
Explanation:
- A) Carbon – ✔ Diamond, graphite, fullerene.
- B) Sulphur – ✔ Rhombic and monoclinic forms.
- C) Phosphorus – ✔ Red and white forms.
- D) All of these – ✔ Correct.
Q69. Which of these metals reacts vigorously with water?
A) Sodium
B) Magnesium
C) Aluminium
D) Zinc
✅ Correct Answer: A) Sodium
Explanation:
- A) Sodium – ✔ Very reactive, explosive with water.
- B) Magnesium – Reacts slowly with hot water.
- C) Aluminium – Does not react with cold water.
- D) Zinc – Reacts slowly with water.
Q70. Which non-metal is used in fire extinguishers?
A) Carbon dioxide
B) Oxygen
C) Nitrogen
D) Chlorine
✅ Correct Answer: A) Carbon dioxide
Explanation:
- A) CO₂ – ✔ Smothers fire.
- B) Oxygen – Supports burning.
- C) Nitrogen – Inert, but not main.
- D) Chlorine – Toxic, not extinguisher.
Q71. Which metal is used in making electrical cables along with copper?
A) Aluminium
B) Iron
C) Zinc
D) Lead
✅ Correct Answer: A) Aluminium
Explanation:
- A) Aluminium – ✔ Light, good conductor, used in cables.
- B) Iron – Not good conductor.
- C) Zinc – Not used.
- D) Lead – Poor conductor.
Q72. Which non-metal is used in the manufacture of ammonia?
A) Nitrogen
B) Carbon
C) Sulphur
D) Phosphorus
✅ Correct Answer: A) Nitrogen
Explanation:
- A) Nitrogen – ✔ Reacts with hydrogen to make ammonia.
- B, C, D – Not used in ammonia production.
Q73. Which metal is used to make thermite mixture for welding?
A) Aluminium
B) Copper
C) Zinc
D) Iron
✅ Correct Answer: A) Aluminium
Explanation:
- A) Aluminium – ✔ Reacts with iron oxide in thermite welding.
- B) Copper – Not used.
- C) Zinc – Not used.
- D) Iron – Produced as result, not reactant.
Q74. Which of these metals is the least reactive?
A) Zinc
B) Copper
C) Gold
D) Aluminium
✅ Correct Answer: C) Gold
Explanation:
- A) Zinc – Reactive.
- B) Copper – Less reactive but tarnishes.
- C) Gold – ✔ Very unreactive, does not corrode.
- D) Aluminium – Quite reactive.
Q75. Which non-metal is used in making fertilisers and explosives?
A) Nitrogen
B) Oxygen
C) Sulphur
D) Carbon
✅ Correct Answer: A) Nitrogen
Explanation:
- A) Nitrogen – ✔ Urea, ammonium salts, explosives (TNT).
- B) Oxygen – Supports combustion, not fertiliser.
- C) Sulphur – Gunpowder, but not main.
- D) Carbon – Not used in fertilisers.
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