213 ppt8 Methods of Heat Transfer Quiz

Which of the following is a method by which heat can be transferred?

• Evaporation

• Conduction

• Absorption

• Reflection

Answer explanation

Conduction is a method of heat transfer through direct contact between materials. Unlike evaporation, absorption, or reflection, which do not involve direct contact, conduction effectively transfers heat between solid objects.

What is one of the three methods of heat transfer?

• Diffusion

• Convection

• Insulation

• Compression

Answer explanation

Convection is one of the three methods of heat transfer, alongside conduction and radiation. It involves the movement of fluids (liquids or gases) that carry heat with them, making it a key process in heating and cooling.

Radiation is a method of heat transfer. Which of the following is NOT a method of heat transfer?

• Conduction

• Convection

• Radiation

• Filtration

Answer explanation

Filtration is not a method of heat transfer. The three methods of heat transfer are conduction, convection, and radiation, which involve the transfer of thermal energy, while filtration pertains to separating substances.

What is conduction in the context of heat transfer?

• Heat traveling through a vacuum

• Heat traveling through or along a material

• Heat traveling through radiation

• Heat traveling through convection

Answer explanation

Conduction is the process of heat transfer through or along a material, where thermal energy moves from one particle to another within the substance. This distinguishes it from radiation and convection.

Which of the following is an example of conduction?

• Heating a room with a radiator

• Heating copper tube to solder

• Sunlight warming the Earth

• Boiling water in a pot

Answer explanation

Conduction is the transfer of heat through direct contact. Heating a copper tube to solder involves direct contact between the heat source and the tube, making it a clear example of conduction.

Which material is a good thermal conductor?

• Plastic

• Wood

• Copper

• Rubber

Answer explanation

Copper is a highly efficient thermal conductor, making it ideal for applications requiring heat transfer. In contrast, plastic, wood, and rubber are poor conductors of heat.

Which of the following materials is considered a good thermal conductor?

• Wood

• Copper

• Polystyrene

• Still air

Answer explanation

Copper is a highly efficient thermal conductor, allowing heat to pass through it easily. In contrast, wood, polystyrene, and still air are poor conductors of heat, making copper the correct choice.

What is a characteristic of materials that are good thermal conductors?

• They are also good electrical conductors.

• They are poor electrical conductors.

• They are always non-metallic.

• They are always lightweight.

Answer explanation

Good thermal conductors, like metals, typically have free electrons that facilitate both heat and electrical conductivity. Therefore, they are also good electrical conductors.

Which material is a bad thermal conductor?

• Aluminium

• Iron

• Still air

• Glass

Answer explanation

Still air is a poor thermal conductor compared to metals like aluminium and iron, which conduct heat well. Glass also conducts heat better than still air, making still air the correct choice as a bad thermal conductor.

What can be used as an insulator due to its poor thermal conductivity?

• Copper

• Aluminium

• Polystyrene

• Iron

Answer explanation

Polystyrene is an effective insulator because it has poor thermal conductivity, making it ideal for reducing heat transfer. In contrast, metals like copper, aluminium, and iron are good conductors of heat.