SEPARATION METHODS

Which one is a form of heat transfer?

• Conduction

• Absorption

• Refraction

• Reflection

Which of the following statements about convection is true?

• Convection always involves the circulation of a liquid or gas

• All types of currents are convection currents

• Convection occurs between solids only at high temperatures

• Convection can only occur during the process of boiling

As a thunderhead builds, warm air at the Earth's surface rises and cold air high aloft sinks downward. What heat transfer process is occurring here?

• Conduction

• Convection

• Radiation

• Induction

A gardener carefully places her outdoor thermometer in a shady location out of direct sunlight, so that it doesn't give incorrectly high readings. What method of heat transfer is she trying to avoid?

• Induction

• Conduction

• Radiation

• Convection

Which one of the following do all methods of heat transfer require?

• The movement of particles

• A difference in thermal energy

• A liquid or gaseous state

• Direct physical contact

Which of the following statements about radiation heat transfer is true?

• A radiant heat source transfers heat by energizing the molecules of air around it

• Radiation heat transfer does not involve particles

• Only glowing objects can be a radiant heat source

• Radiant heat transfer explains why a spoon in a cup of hot tea soon feels warm

Liquids ____________________.

• have a defined shape and volume

• have a defined shape but undefined volume

• have an undefined shape but defined volume

• have both undefined shape and volume

Why do solids have a fixed shape?

• The particles are fixed in place

• The particles are closely packed

• The particles vibrate

• None of these

What is the name of the change when a liquid becomes a solid?

• Melting

• Freezing

• Solidification

• Both freezing and solidification

What is sublimation?

• When a solid turns into a gas

• When a gas turns into a solid

• When a gas turns into a liquid

• When gas turns into solid