6.PS-Heat Transfer Quiz

What is heat transfer?

• The movement of electrical energy through a circuit.

• The process by which thermal energy moves from a warmer object to a cooler one.

• The absorption of light by a surface.

• The conversion of mechanical energy into sound.

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Heat always flows from a ______ object to a ______ object until thermal equilibrium is reached.

• colder; warmer

• lighter; darker

• warmer; cooler

• solid; liquid

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Which method of heat transfer occurs through direct contact between substances?

• Conduction

• Convection

• Radiation

• Insulation

Metals are considered good conductors because they:

• Have tightly packed particles that quickly transfer energy.

• Contain a lot of air pockets.

• Reflect heat away from their surfaces.

• Are not affected by temperature.

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Convection transfers heat through:

• Direct contact between objects.

• Electromagnetic waves.

• The movement of fluids (liquids or gases).

• Chemical reactions.

In convection, warm fluid tends to ______ and cool fluid tends to ______.

• sink; rise

• rise; sink

• stay; remain

• evaporate; condense

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Radiation transfers heat via:

• Direct contact.

• Fluid movement.

• Electromagnetic waves.

• Chemical bonding.

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Unlike conduction and convection, radiation does not require a ______ to travel.

• Liquid

• Solid

• Medium

• Vacuum

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Darker surfaces absorb more heat because they:

• Reflect more light.

• Absorb more wavelengths of light.

• Have a higher melting point.

• Are always hotter.

Which everyday appliance primarily uses convection to cool a room?

• Refrigerator

• Air conditioner

• Microwave oven

• Television

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