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Quiz Chapter 8: Manufactured Substances in Industry

10 questions · Form 4 Chemistry Bab 8: Manufactured Substances in Industry

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which property is characteristic of advanced ceramics like silicon carbide or alumina?

  1. High electrical conductivity at room temperature
  2. High resistance to wear, heat, and chemical corrosion
  3. High flexibility and ductility under high tension
  4. Low melting point and high solubility in water
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Answer: B

Advanced ceramics withstand extreme temperatures, wear, and chemical degradation, making them suitable for car engine parts and cutting tools.

2. Which component in Stainless Steel provides its high resistance to corrosion and rusting?

  1. Carbon
  2. Chromium and Nickel
  3. Zinc and Tin
  4. Aluminium and Magnesium
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Answer: B

Chromium and Nickel added to iron form a protective oxide film that prevents rusting in stainless steel.

3. What is the main component added to silica in soda-lime glass manufacturing to reduce its melting point?

  1. Sodium carbonate (Soda)
  2. Boron oxide
  3. Lead oxide
  4. Aluminium oxide
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Answer: A

Sodium carbonate (soda) lowers the melting point of silica (SiO2) from ~1700°C down to ~1000°C.

4. What is the primary composition of Brass?

  1. Copper and Tin
  2. Copper and Zinc
  3. Iron and Carbon
  4. Aluminium and Magnesium
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Answer: B

Brass consists of Copper (~70%) and Zinc (~30%).

5. Why are pure metals soft and easily bent when force is applied?

  1. The atoms are loosely held together by weak covalent bonds
  2. Atoms of the same size are arranged in neat layers that slide easily over one another
  3. Electrons move freely in the metallic lattice, creating gaps
  4. Pure metals contain large air bubbles between their atomic boundaries
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Answer: B

Pure metal atoms are uniform in size and arranged in orderly layers. Applying a force easily slides these layers over each other.

6. Which oxide is added during the production of lead crystal glass to increase its refractive index and density?

  1. Lead(II) oxide
  2. Boron oxide
  3. Sodium carbonate
  4. Calcium carbonate
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Answer: A

Lead(II) oxide (PbO) gives lead crystal glass high luster, heavy weight, and a high refractive index.

7. Which alloy is specifically used to manufacture aircraft bodies due to its high strength and low density?

  1. Bronze
  2. Brass
  3. Pewter
  4. Duralumin
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Answer: D

Duralumin is made mostly of aluminium, making it lightweight yet strong enough for aircraft structures.

8. In reinforced concrete, what material acts as the reinforcement component to increase tensile strength?

  1. Concrete slurry
  2. Steel bars or wire mesh
  3. Glass fibers
  4. Carbon polymer matrix
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Answer: B

Concrete has high compressive strength, while steel bars embedded inside act as reinforcement to provide high tensile strength.

9. Which alloy is composed of 90% Copper and 10% Tin?

  1. Brass
  2. Stainless Steel
  3. Bronze
  4. Duralumin
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Answer: C

Bronze consists of 90% Copper and 10% Tin.

10. What happens on an atomic level when foreign atoms are added to a pure metal during alloying?

  1. They form covalent bonds that lock all metal atoms in place permanently
  2. They melt the host metal atoms into liquid form
  3. They disrupt the orderly arrangement of host atoms, preventing layers from sliding easily
  4. They remove all free electrons from the metallic bond structure
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Answer: C

Foreign atoms have different atomic radii, disrupting the orderly layers and blocking them from sliding past one another easily.

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