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Quiz Chapter 8: Manufactured Substances in Industry

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

Question 1 of 10Score: 0

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

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 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.

2. Which compound embedded in photochromic glass causes it to darken upon exposure to ultraviolet (UV) light?

  1. Silicon dioxide
  2. Silver chloride or Silver bromide
  3. Copper(II) sulfate
  4. Lead(II) oxide
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Answer: B

Silver chloride (AgCl) or silver bromide (AgBr) dissociates into silver atoms under UV radiation, darkening the glass.

3. What is a composite material?

  1. A chemical compound formed by ionic bonding between a metal and a non-metal
  2. A homogeneous mixture of two metals melted together
  3. A material formed by combining two or more non-homogeneous substances with distinct physical properties
  4. A pure substance containing atoms of identical atomic numbers
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Answer: C

A composite material combines two or more different constituents (matrix and reinforcement) to achieve superior properties.

4. 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.

5. Which composite material exhibits zero electrical resistance when cooled to extremely low temperatures?

  1. Superconductors
  2. Fiberglass
  3. Photochromic glass
  4. Reinforced concrete
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Answer: A

Superconductors conduct electricity with zero resistance below a specific critical temperature.

6. What is the primary natural raw material used in manufacturing traditional ceramics?

  1. Silica sand
  2. Clay (Kaolin)
  3. Limestone
  4. Bauxite
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Answer: B

Kaolin (hydrated aluminium silicate clay) is the main natural ingredient used to make traditional ceramic products.

7. 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.

8. 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.

9. 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.

10. 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%).

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