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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
456 j
C
15048 j
D
150 J
2) Batteries are devices that change chemical energy to ______ energy
A
mechanical
B
nuclear
C
electrical
D
radiant
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
potential
B
both potential and kinetic
C
neither potential nor kinetic
D
kinetic
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
potential
B
nuclear
C
radient
D
thermal
5) An iPod completes the following conversions:
A
chemical to electrical to sound
B
thermal to sound
C
electric to thermal to sound
D
sound to thermal
6) As you move up through the levels of the energy pyramid, the amount of usable energy:
A
can both increase and decrease
B
stays the same
C
increase
D
decrease
7) The organisms at the bottom of the food chain (food pyramid) are:
A
carnivores
B
producers
C
herbivores
D
decomposers
8) Where does the energy used to drive the water cycle comes from
A
wind
B
the sun
C
air
D
geothermal heat
9) When the total energy of a system remains the same over time, the system is in:
A
cycle
B
transistion
C
conversion
D
steady state
10) Calculate the overall efficiency of a device that uses two different processes with efficiencies of 80% and 15 %
A
12%
B
8%
C
15%
D
80%
*select an answer for all questions
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