Unit 2 Test Practice

Which describes how radiation moves?

• Radiation moves from a cooler object to a warmer object

• Radiation moves from a warmer object to a cooler object

• Radiation moves from a warm object to an object of the same temperature

• Radiation moves from a cool object to an object of the same temperature

Evan drew a diagram to illustrate radiation. What do the arrows represent?

• gases mixing with particles

• liquid moving through a vacuum

• moving particles

• electromagnetic waves

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Which material most likely gets the warmest when placed in the Sun?

• White plastic

• Yellow plastic

• Orange plastic

• Black plastic

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Which best describes convection?

• It relies on the collision of particles within or between substances.

• It occurs in solids, liquids, or gases that are heated.

• It results when portions of a liquid cool and rise.

• It is driven by temperature differences within a fluid.

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A student heats a liquid on a burner. What happens to the portion of liquid that first begins to warm?

• It loses energy

• It becomes less dense.

• It sinks downward.

• Its molecules get closer together.

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The diagram shows currents that form as water is heated.

Which would most likely contain this same type of current?

• the air above a wildfire

• a carton of milk in a refrigerator

• a snowdrift on a shady mountainside

• a boulder in a hot desert

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In which of these does convection only occur in?

• gases

• fluids

• liquids

• solids

Conduction involves the transfer of electric charge or ___________ due to the movement of particles.

• thermal energy

• light waves

• protons

• neutrons

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Which material is typically used as a thermal insulator?

• copper

• foam

• ceramic

• aluminum

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A scientist designed a foam container to help keep frozen foods from melting. Which best explains how the foam works?

• It removes thermal energy from the air inside the container.

• It removes thermal energy from the frozen foods inside the container.

• It reduces the amount of thermal energy that is transferred from inside to outside the container.

• It reduces the amount of thermal energy that is transferred from outside to inside the container.

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