Physical properties ​

Which of the following is NOT a physical property of materials?

• Density

• Melting point

• Conductivity

• Elasticity

What is thermal conductivity a measure of?

• The quantity of heat that flows through a material per unit of time, cross-sectioned area, and length.

• The quantity of electricity that flows through a material.

• The resistance to heat flow in a material.

• The temperature difference across a material.

Materials with low thermal conductivity are typically used as:

• Heat sinks.

• Insulators.

• Components in high temperature environments.

• Conductors of electricity.

Which of the following applications are likely to use materials with high thermal conductivity?

• Insulation

• Heat exchangers or refrigeration

• Electrical insulation

• Low temperature environments

Why is it important to understand the environment when considering the thermal conductivity of materials?

• Because it affects the color of the material.

• Because it determines the electrical conductivity only.

• Because high temperature components require high thermal conductivity.

• Because it affects the cost of the material.

What does corrosion resistance describe in materials?

• A) A material's ability to conduct electricity

• B) A material's ability to withstand tensile stress

• C) A material's ability to prevent natural chemical or electrochemical attack

• D) A material's ability to resist thermal expansion

Which of the following is NOT a form of corrosion mentioned in the text?

• A) Pitting

• B) Galvanic reaction

• C) Intercrystalline corrosion

• D) Parting

How is corrosion resistance typically expressed?

• A) As the maximum depth in millimeters to which corrosion would penetrate in one year

• B) As the total surface area affected by corrosion in one year

• C) As the percentage of material lost due to corrosion in one year

• D) As the rate of corrosion spread per square meter per year

What is the purpose of adding plating or coating to some materials?

• To enhance their electrical conductivity

• To improve their appearance

• To enhance corrosion resistance

• To increase their weight

Are metals that belong to families that resist corrosion completely safe from it in all conditions?

• Yes, they are completely safe from corrosion

• No, they are still subject to specific environmental conditions

• Yes, but only when submerged in water

• No, they are more susceptible to corrosion than other metals