Unit Test — Unit test Answers
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Which of these indicates that a liquid has transferred thermal energy to the air?
A
The liquid increases in temperature, and its particles lose kinetic energy.B
The liquid decreases in temperature, and its particles gain kinetic energy.C
The liquid increases in temperature, and its particles gain kinetic energy.D
The liquid decreases in temperature, and its particles lose kinetic energy.22
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A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor.If the motor is used for 30 s, how much work does it do? (Power: P = W/t)
A
0.03 JB
30 JC
960 JD
27,000 J23
Nuclear reactions in a reactor produce a lot of thermal energy. That energy then flows and warms up water, which boils and produces steam. The steam then turns turbines that generate electricity.
A
Heat flows in the form of electricity.B
Heat flows from the reactor to the water.C
The water produces heat.D
The steam produces heat.24
In which of these can convection not occur?
A
gasesB
solidsC
liquidsD
fluids25
The diagram shows currents that form as water is heated.
A
the air above a wildfireB
a carton of milk in a refrigeratorC
a snowdrift on a shady mountainsideD
a boulder in a hot desertDid you find these answers helpful?
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