3 Unit 44 Material properties

What is the definition of density?

• Density is the mass per unit volume (kg/m³) of a substance.

• Density is the weight per unit area (N/m²) of a substance.

• Density is the volume per unit mass (m³/kg) of a substance.

• Density is the force per unit length (N/m) of a substance.

True or False: The density of water is 1000 kg/m³.

• True

• False

Magnets attract objects made of which type of materials?

• Magnetic materials

• Non-magnetic materials

• Plastic materials

• Glass materials

Which types of stainless steels are not magnetic?

• Some types of stainless steels are not magnetic.

• All types of stainless steels are not magnetic.

• No types of stainless steels are not magnetic.

• Only carbon steels are not magnetic.

Ultimate tensile strength (or just tensile strength for short) is an important property of materials to determine their ________ performance.

• mechanical

• thermal

• optical

• electrical

The more resistant to bending a material is, the more _______ it is.

• rigid

• flexible

• brittle

• soft

Which of the following are types of conductivity?

• A) Electrical

• B) Thermal

• C) Acoustical

• D) All of the above