AME3-003 Remember Session 11 (Physical)?

What is thermal conductivity?

• The ability of a material to transfer heat
• The ability of a material to reflect light
• The ability of a material to resist electricity
• The ability of a material to change temperature

Answer explanation

Thermal conductivity is how easily heat travels through a material. Think of a metal pan on a stove - the heat moves quickly through the pan to cook your food.

Which of the following is a good conductor of heat?

• Copper
• Wood
• Plastic
• Air

Answer explanation

Copper is an excellent heat conductor, that's why it's used in things like pots and pans, and heating elements.

What is specific heat capacity?

• The amount of heat needed to raise the temperature of a material
• The temperature at which a material melts
• The ability of a material to conduct electricity
• The density of a material

Answer explanation

Specific heat capacity tells you how much heat energy it takes to raise the temperature of something. Water has a high specific heat capacity, which is why it takes a while to boil.

What is thermal stability?

• The ability of a material to maintain its properties at high temperatures
• The ability of a material to change its shape
• The ability of a material to conduct electricity
• The ability of a material to resist corrosion

Answer explanation

Thermal stability means a material can handle high temperatures without falling apart or changing its properties too much. This is important for things like engine parts or ovenware.

What is electrical conductivity?

• The ability of a material to allow electric current to flow
• The ability of a material to resist electricity
• The ability of a material to conduct heat
• The ability of a material to attract a magnet

Answer explanation

Electrical conductivity is how easily electricity flows through a material. Metals like copper are great conductors, which is why we use them for electrical wires.

Which of the following is a good conductor of electricity?

• Copper
• Rubber
• Glass
• Wood

Answer explanation

Copper is a top choice for electrical wiring because it lets electricity flow with very little resistance.

What is ferromagnetism?

• The ability of a material to be strongly attracted to a magnet
• The ability of a material to be weakly attracted to a magnet
• The ability of a material to be weakly repelled by a magnet
• The ability of a material to conduct electricity

Answer explanation

Ferromagnetism is when a material is strongly attracted to magnets. Think of iron - it sticks to magnets easily.

What is the melting point of a material?

• The temperature at which a solid material transitions to a liquid state
• The temperature at which a material catches fire
• The ability of a material to conduct heat
• The density of a material

Answer explanation

The melting point is the exact temperature when a solid turns into a liquid. For example, ice melts into water at 0 degrees Celsius.

What is density?

• The amount of mass per unit volume of a material
• The ability of a material to float on water
• The ability of a material to resist corrosion
• The ability of a material to conduct electricity

Answer explanation

Density is how much matter is packed into a certain space. A lead brick is denser than a sponge because it has more mass in the same volume.

What are acoustic properties?

• How a material interacts with sound waves
• The ability of a material to resist electricity
• The ability of a material to conduct heat
• The ability of a material to attract a magnet

Answer explanation

Acoustic properties describe how a material interacts with sound. Some materials absorb sound, others reflect it, and this affects how we hear things.