Quiz Chapter 8: Manufactured Substances in Industry

1. 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

2. 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

3. Through what optical phenomenon do optical fibers transmit digital signals over long distances?

1. Diffraction of light rays
2. Total internal reflection
3. Refraction through a concave lens
4. Polarization of light waves

4. What is the primary composition of Brass?

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

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

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

6. 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

7. 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

8. 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

9. Which of the following is an example of an alloy of Tin?

1. Steel
2. Pewter
3. Brass
4. Duralumin

10. Which type of glass can withstand sudden thermal shock and high temperatures, making it ideal for laboratory apparatus?

1. Soda-lime glass
2. Borosilicate glass
3. Lead crystal glass
4. Fused silica glass