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Chapter 8 Review
Test Description: Exam review
Instructions: Answer all questions to get your test result.
1) A car engine is only 33% efficient, if the car requires 456 J of work to operate, what is the car’s work output?
A
77600 j
B
150 J
C
456 j
D
15048 j
2) Batteries are devices that change chemical energy to ______ energy
A
mechanical
B
radiant
C
nuclear
D
electrical
3) Carl eats a chocolate chip cookie and then climbs up a set of stairs. In doing so the cookie is transformed into ____________ energy.
A
neither potential nor kinetic
B
kinetic
C
both potential and kinetic
D
potential
4) The efficiency of most machines is less than 100%. Due to friction, energy seems to be lost. While the energy is not lost, it does work that is not useful or it is converted ___ energy.
A
radient
B
potential
C
nuclear
D
thermal
5) An iPod completes the following conversions:
A
chemical to electrical to sound
B
thermal to sound
C
sound to thermal
D
electric to thermal to sound
6) As you move up through the levels of the energy pyramid, the amount of usable energy:
A
stays the same
B
increase
C
decrease
D
can both increase and decrease
7) The organisms at the bottom of the food chain (food pyramid) are:
A
herbivores
B
carnivores
C
decomposers
D
producers
8) Where does the energy used to drive the water cycle comes from
A
geothermal heat
B
the sun
C
wind
D
air
9) When the total energy of a system remains the same over time, the system is in:
A
transistion
B
steady state
C
conversion
D
cycle
10) Calculate the overall efficiency of a device that uses two different processes with efficiencies of 80% and 15 %
A
80%
B
15%
C
8%
D
12%
*select an answer for all questions
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