# Worksheet: Conduction and Convection

In this worksheet, we will practice describing heat transfer through solid materials via conduction and defining the factors that determine the effectiveness of insulation.

Q1:

Which of the following is the correct definition of conduction?

• AConduction is the process of high-energy particles moving away from a part of a material that is hotter to one that is colder.
• BConduction is the process of energy transferring from a hot object via the radiation of electromagnetic waves.
• CConduction is the process of heat transferring from one part of a solid to another due to collisions between particles within the solid.
• DConduction is the process of high-energy particles moving away from a part of a material that is colder to one that is hotter.

Q2:

Which of the following does the energy transferred per second through a layer of insulating material depend on?

1. The thickness of the material
2. The mass of the material
3. The color of the material
4. The thermal conductivity of the material
5. The temperature difference across the material
• Aa, d, c
• Bb, d, e
• Cc, d, e
• Da, b, c
• Ea, d, e

Q3:

Which of the following materials is likely to have the lowest thermal conductivity?

• ACopper
• BWood
• CGold
• DIron
• ETin

Q4:

Which of the following materials is likely to have the highest thermal conductivity?

• AWood
• BGlass
• CFelt
• DCopper
• EPlastic

Q5:

Which of the following is the correct definition of convection?

• AConvection is the process of high-energy particles moving away from a part of a material that is colder to one that is hotter.
• BConvection is the process of energy transferring from a hot object via the radiation of electromagnetic waves.
• CConvection is the process of heat transferring from one part of a solid to another by the collision of particles and the movement of electrons within the solid.
• DConvection is the process of high-energy particles moving away from a part of a material that is hotter to one that is colder.

Q6:

Amelia wraps three beakers in different materials. She then fills the beakers with water at . She measures the temperature of the water in each beaker 30 minutes later. Her results are shown in the table.

Material Initial Temperature of the Water Temperature of the Water after 30 Minutes Felt Cardboard Aluminum Foil 100∘C 100∘C 100∘C 34∘C 38∘C 25∘C

Which material was the best insulator?

• ACardboard
• BFelt
• CAluminum foil

Which material was the worst insulator?

• AFelt
• BCardboard
• CAluminum foil

Q7:

Two blocks of a material are placed next to each other, so that they are in contact with each other. The material of block A is at a higher temperature than the material of block B.

Energy is transferred from block to block until the two blocks are .

• AB, A, at the same temperature
• BA, B, both at
• CA, B, both at 0 K
• DA, B, at the same temperature
• EB, A, both at

Q8:

Which of the following units could be used as a measure of the rate at which heat is conducted along an object?

• AJoules
• BWatts
• CKilowatt-hours
• DSeconds
• EHertz

Q9:

The diagram shows three different types of wall that could be built in a house.

Through which wall would the most heat be lost?

• AThe thin steel wall
• BThe one-layer brick wall
• CThe two-layer brick wall

Which wall would provide the greatest heat insulation for the house?

• AThe thin steel wall
• BThe two-layer brick wall
• CThe one-layer brick wall