4.1 DT

A material with a high mass but a small volume will have:

• High density

• Low density

• A variable density depending on shape

• No relation between mass and volume

Electrical resistivity is an important property in:

• Cooking pans that distribute heat evenly

• Protective gloves used by electricians

• Structural materials in skyscrapers

• Road surfaces designed to prevent skidding

Which of the following is the best material for a cooking utensil handle to prevent burns?

• Silicone

• Aluminum

• Stainless steel

• Copper

A glass container cracks when exposed to sudden temperature changes. Which property is responsible for this failure?

• High thermal expansion

• Low electrical resistivity

• High thermal conductivity

• High density

Which of the following applications requires a material with high hardness?

• A hammer striking a nail

• A rubber mat for gym flooring

• A cushion inside a helmet

• A flexible plastic cover for a smartphone

A mattress is designed with different foam densities. What is the primary benefit of this?

• To balance weight distribution and comfort

• To prevent the mattress from expanding when heated

• To increase the electrical conductivity of the foam

• To ensure all layers have the same level of softness

Which property is most important for materials used in elevator cables?

• High tensile strength

• High compressive strength

• High electrical conductivity

• High hardness

A material with high compressive strength is best suited for:

• A steel wire used in a suspension bridge

• A concrete column supporting a building

• A rubber seal in a car engine

• A lightweight drone wing

Which of the following correctly describes stiffness?

• The ability to absorb impact without breaking

• The ability to resist bending or deflection under force

• The ability to stretch before breaking

• The ability to be reshaped under compression

Aircraft wings must be stiff but not completely rigid. Which combination of properties best explains this requirement?

• High stiffness and some plasticity

• High Stiffness and low density

• High Stiffness and tensile strength

• High stiffness and high thermal expansion