Materials: Metals and Non-Metals Part 4: MCQs (Q76–Q100)
⚙️ Materials: Metals and Non-Metals – MCQs for Class 8 Science
Part 4: Q76 – Q100
Q76. Which non-metal is used in the preparation of sulphuric acid?
A) Carbon
B) Phosphorus
C) Sulphur
D) Oxygen
✅ Correct Answer: C) Sulphur
Explanation:
- A) Carbon – Used for CO₂, not sulphuric acid.
- B) Phosphorus – Not used here.
- C) Sulphur – ✔ Main raw material for H₂SO₄.
- D) Oxygen – Required for combustion, not the raw material.
Q77. Which metal is most commonly used in building bridges?
A) Copper
B) Iron (steel)
C) Aluminium
D) Zinc
✅ Correct Answer: B) Iron (steel)
Explanation:
- A) Copper – Expensive, not used for bridges.
- B) Iron (steel) – ✔ Strong and durable → bridges.
- C) Aluminium – Light but less strong.
- D) Zinc – Brittle, not suitable.
Q78. Which gas is produced when zinc reacts with hydrochloric acid?
A) Oxygen
B) Nitrogen
C) Hydrogen
D) Carbon dioxide
✅ Correct Answer: C) Hydrogen
Explanation:
- A) Oxygen – Not formed.
- B) Nitrogen – Not formed.
- C) Hydrogen – ✔ Zn + HCl → ZnCl₂ + H₂.
- D) Carbon dioxide – Produced with carbonates, not metals.
Q79. Which non-metal is used in making explosives and matches?
A) Nitrogen
B) Sulphur
C) Phosphorus
D) All of these
✅ Correct Answer: D) All of these
Explanation:
- A) Nitrogen – TNT, RDX.
- B) Sulphur – Gunpowder.
- C) Phosphorus – Matchsticks, fireworks.
- D) All of these – ✔ Correct.
Q80. Which metal is used in making aircraft bodies?
A) Iron
B) Copper
C) Aluminium
D) Zinc
✅ Correct Answer: C) Aluminium
Explanation:
- A) Iron – Heavy, corrodes.
- B) Copper – Heavy, costly.
- C) Aluminium – ✔ Light, strong, corrosion-resistant.
- D) Zinc – Not suitable.
Q81. Which of these metals is highly reactive and kept in kerosene?
A) Gold
B) Aluminium
C) Sodium
D) Copper
✅ Correct Answer: C) Sodium
Explanation:
- A) Gold – Unreactive.
- B) Aluminium – Forms oxide layer, stable.
- C) Sodium – ✔ Very reactive, kept in kerosene.
- D) Copper – Stable, not stored.
Q82. Which non-metal is used in making proteins and DNA?
A) Nitrogen
B) Phosphorus
C) Both A and B
D) Carbon
✅ Correct Answer: C) Both A and B
Explanation:
- A) Nitrogen – ✔ Needed for amino acids (proteins).
- B) Phosphorus – ✔ Present in DNA and ATP.
- C) Both A and B – ✔ Correct.
- D) Carbon – Also present, but the focus is nitrogen and phosphorus.
Q83. Which metal is used to coat iron in galvanisation?
A) Copper
B) Zinc
C) Lead
D) Aluminium
✅ Correct Answer: B) Zinc
Explanation:
- A) Copper – Not used.
- B) Zinc – ✔ Protects iron from rusting.
- C) Lead – Toxic, not used.
- D) Aluminium – Forms oxide but not used for galvanisation.
Q84. Which non-metal is used in the purification of water?
A) Oxygen
B) Chlorine
C) Iodine
D) Sulphur
✅ Correct Answer: B) Chlorine
Explanation:
- A) Oxygen – Not disinfectant.
- B) Chlorine – ✔ Kills germs in water.
- C) Iodine – Used as antiseptic, not water purification.
- D) Sulphur – Not used.
Q85. Which of these is the least reactive metal?
A) Zinc
B) Copper
C) Gold
D) Iron
✅ Correct Answer: C) Gold
Explanation:
- A) Zinc – Quite reactive.
- B) Copper – Less reactive, but tarnishes.
- C) Gold – ✔ Least reactive, does not corrode.
- D) Iron – Rusts easily.
Q86. Which non-metal is stored under water to prevent catching fire?
A) Carbon
B) Sulphur
C) Phosphorus
D) Iodine
✅ Correct Answer: C) Phosphorus
Explanation:
- A) Carbon – Stable.
- B) Sulphur – Stable in air.
- C) Phosphorus – ✔ White phosphorus catches fire easily, kept under water.
- D) Iodine – Stable solid.
Q87. Which gas is produced when carbon reacts with oxygen?
A) Hydrogen
B) Carbon dioxide
C) Nitrogen
D) Oxygen
✅ Correct Answer: B) Carbon dioxide
Explanation:
- A) Hydrogen – Not produced.
- B) Carbon dioxide – ✔ Carbon + O₂ → CO₂.
- C) Nitrogen – Not produced.
- D) Oxygen – Reactant, not product.
Q88. Which property is NOT shown by non-metals?
A) Brittleness
B) Dullness
C) Sonority
D) Poor conductivity
✅ Correct Answer: C) Sonority
Explanation:
- A) Brittleness – ✔ Shown by non-metals.
- B) Dullness – ✔ Non-metals are dull.
- C) Sonority – ✔ Metals show this, non-metals do not.
- D) Poor conductivity – ✔ Non-metals show this.
Q89. Which non-metal is used in the making of matchstick heads?
A) Nitrogen
B) Sulphur
C) Phosphorus
D) Oxygen
✅ Correct Answer: C) Phosphorus
Explanation:
- A) Nitrogen – Not used.
- B) Sulphur – Present in matchstick body, not head.
- C) Phosphorus – ✔ Used in matchstick heads.
- D) Oxygen – Supports burning but not used in match heads.
Q90. Which metal is used in making bells and wires?
A) Silver
B) Copper
C) Zinc
D) Aluminium
✅ Correct Answer: B) Copper
Explanation:
- A) Silver – Costly, not used.
- B) Copper – ✔ Sonorous and ductile → bells and wires.
- C) Zinc – Brittle.
- D) Aluminium – Used in wires but not bells.
Q91. Which non-metal is used in pencils?
A) Graphite
B) Sulphur
C) Iodine
D) Phosphorus
✅ Correct Answer: A) Graphite
Explanation:
- A) Graphite – ✔ Form of carbon, conducts electricity, used in pencils.
- B) Sulphur – Used in matchsticks.
- C) Iodine – Antiseptic.
- D) Phosphorus – Used in match heads.
Q92. Which of these metals is used in electroplating?
A) Copper
B) Silver
C) Chromium
D) All of these
✅ Correct Answer: D) All of these
Explanation:
- A) Copper – ✔ Used for plating.
- B) Silver – ✔ Used for plating cutlery.
- C) Chromium – ✔ Used for shiny coating.
- D) All of these – ✔ Correct.
Q93. Which non-metal is used in making fertilisers like urea?
A) Nitrogen
B) Phosphorus
C) Carbon
D) Sulphur
✅ Correct Answer: A) Nitrogen
Explanation:
- A) Nitrogen – ✔ Main in urea and ammonium salts.
- B) Phosphorus – Used in phosphates.
- C) Carbon – Not used in urea.
- D) Sulphur – Not used in urea.
Q94. Which non-metal is known as “King of Chemicals”?
A) Sulphur
B) Oxygen
C) Nitrogen
D) Carbon
✅ Correct Answer: A) Sulphur
Explanation:
- A) Sulphur – ✔ Because sulphuric acid is the most widely used industrial chemical.
- B, C, D – Important elements, but not given this title.
Q95. Which metal is used in the construction of ships because of its strength?
A) Aluminium
B) Zinc
C) Iron (steel)
D) Copper
✅ Correct Answer: C) Iron (steel)
Explanation:
- A) Aluminium – Too light.
- B) Zinc – Brittle.
- C) Iron (steel) – ✔ Strong, durable → ships.
- D) Copper – Too expensive.
Q96. Which non-metal is used in making fireworks?
A) Sulphur
B) Phosphorus
C) Carbon
D) All of these
✅ Correct Answer: D) All of these
Explanation:
- A) Sulphur – ✔ Used in crackers.
- B) Phosphorus – ✔ Used in fireworks.
- C) Carbon – ✔ Used as fuel.
- D) All of these – ✔ Correct.
Q97. Which property is shown by metals when hammered into sheets?
A) Ductility
B) Malleability
C) Sonority
D) Lustre
✅ Correct Answer: B) Malleability
Explanation:
- A) Ductility – Wire making.
- B) Malleability – ✔ Hammered into sheets.
- C) Sonority – Ringing sound.
- D) Lustre – Shine.
Q98. Which non-metal is used in making antiseptic and medicine?
A) Bromine
B) Iodine
C) Phosphorus
D) Sulphur
✅ Correct Answer: B) Iodine
Explanation:
- A) Bromine – Toxic.
- B) Iodine – ✔ Used in tincture iodine.
- C) Phosphorus – Not used in medicine.
- D) Sulphur – Used in gunpowder.
Q99. Which metal is known as the “King of Metals”?
A) Silver
B) Gold
C) Platinum
D) Iron
✅ Correct Answer: B) Gold
Explanation:
- A) Silver – Precious, not called king.
- B) Gold – ✔ Valued since ancient times, “King of Metals.”
- C) Platinum – Valuable, but not this title.
- D) Iron – Called “Metal of Industry.”
Q100. Which non-metal is used in the manufacture of matches, crackers, and gunpowder?
A) Sulphur
B) Nitrogen
C) Oxygen
D) Carbon
✅ Correct Answer: A) Sulphur
Explanation:
- A) Sulphur – ✔ Widely used in matches and crackers.
- B) Nitrogen – Not directly used.
- C) Oxygen – Supports burning, not used in matches.
- D) Carbon – Used as fuel but not main in matches.
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