WW Investigation 3 Question Preview (ID: 48672)
Convection.
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During which process of energy exchange does cold air displace warmer air?
a) conduction
b) convection
c) radiation
d) heat transfer
During which process does heat transfer occur because of density differences?
a) conduction
b) convection
c) radiation
d) heat transfer
In convection, heat transfer energy transfer takes place between
a) two solid surfaces connected physically
b) fluid systems in motion
c) both of these
d) neither of these
Hot substances are _____ dense and _____.
a) more; sinks
b) more; rises
c) less; sinks
d) less; rises
Cold substances are _____ dense, and _____.
a) more, sinks
b) more, rises
c) less, sinks
d) less, rises
Substances that are more dense will
a) sink
b) rise
c)
d)
Substances that are less dense will
a) sink
b) rise
c)
d)
What is the density of a substance with a mass of 515 grams and that takes up 100 mL of space?
a) 51.5 g/mL
b) 515 g
c) 5.15 g/mL
d) 100 mL
Convection currents can take place in
a) solid substances
b) substances that flow (liquids and gases)
c) substances that flow (solids and liquids)
d) solids, liquids and gases
Convection transfers energy by
a) the motion of particles - down for hot particles and up for cold particles
b) contact between the particles
c) passing energy from particle to particle
d) the motion of large numbers of particles in the same direction in fluids.
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