Quiz Chapter 8: Manufactured Substances in Industry

1. 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

2. 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

3. 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

4. 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

5. 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

6. What is the primary composition of Brass?

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

7. 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

8. Which property makes fused silica glass suitable for manufacturing optical lenses and telescope mirrors?

1. High transparency, low thermal expansion, and high heat resistance
2. Low melting point and high flexibility
3. High electrical conductivity
4. High density and high lead content

9. 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

10. Why is fiberglass widely chosen for manufacturing storage tanks and boat hulls over steel?

1. It is heavier and denser than steel
2. It is high in tensile strength, lightweight, and non-corrosive
3. It dissolves completely in organic solvents
4. It conducts electricity efficiently