Energy Practice Test
Energy and Sources of Energy Practice Test
1. The basic SI unit of energy is the _____.
A.
kilogram
B.
joule
C.
newton
D.
kelvin
2. There are two types of energy: __________ and _____________.
A.
kinetic energy, gravitational potential energy
B.
Electrical energy, thermal energy
C.
Sound energy, light energy
D.
potential energy, and kinetic energy
3. The total amount of kinetic and potential energy in a system is called _____.
A.
specific heat
B.
mechanical energy
C. stored energy
D.
temperature
4. As the kinetic energy of a material increases, the average _____ of its particles increases.
A.
kinetic energy
B.
potential energy
C.
temperature
D.
mass
5. The amount of kinetic energy an object has depends on its _________, the amount of gravitational potential energy depends on its _________, and both a related to an object’s ________.
A.
Volume, mass, speed
B.
Force, gravity, mass
C.
Height, gravity, mass
D.
Speed, height, mass
6. Which kind of energy is the energy that is determined by the position of the object relative to the nearest source of gravity?
A.
kinetic energy
B.
thermal energy
C.
potential energy
D. temperature
7. Energy cannot _____ under ordinary conditions.
A.
be destroyed
B.
be stored
C.
change form
D.
cause change
8. A painter at the bottom of a 10-m ladder has _____ than she would have at the top of a 4-m ladder.
A.
Less potential energy
B.
less thermal energy
C.
more potential energy
D.
more momentum
9. The ability to cause change is _______.
A.
energy
B.
work
C.
potential
D.
specific heat
10. When energy changes from one form to other forms, there is ______.
A.
a net increase in energy
B.
a net decrease in energy
C.
no loss of total energy
D.
not enough information given
11. Why are fossil fuels used so widely today
A.
They are a clean, pollutionless source of energy
B.
to convert petroleum into natural gas
C.
They are more efficient and cheaper than most other sources of energy
D.
They are the most efficient source of energy
12. What does it mean to say that fossil fuels are nonrewable?
A.
They cannot be replaced as fast as they are used.
B.
They are expensive.
C.
Uranium, which is scarce, is used in producing them.
D.
People can’t agree on where to dispose of waste products they produce.
13. Explain how a windmill works.
A.
Wind makes heat, which flows to a water tank; steam rotates a generator.
B.
Wind turns a turbine that rotates a generator to produce electricity.
C.
It pumps extremely hot water from underground.
D.
It captures solar energy and converts it into electricity, which turns the turbine.
14. What are the energy transformations that occur in geothermal energy production?
A.
Thermal of earth to mechanical of the turbine to the electrical in the generator.
B. Mechanical of the earth, to thermal in the water, to mechanical in the generator, to mechanical in the turbine, and then to electrical in the generator
C.
It heats Earth’s core, where nuclear fission reactions occur.
D. Thermal from the earth transfers to the water, thermal from steam to mechanical in the turbine, mechanical of turbine to mechanical of generator, and mechanical there to electrical.
15. All of the following: burning fossil fuels, solar towers, geothermal energy, and nuclear fission must first be used to produce ______ in order to produce electricity. That substance then goes on to ________
A.
Steam, turn a turbine
B.
carbon dioxide, heat water
C.
Plutonium, chain react
D.
Water, boil
Free Response:
16. Please explain all of the energy transformations that occur in the process of using fossil fuels to make electricity. Include in here energy transformations that result in wasted energy (energy forms that are not useful for making electricity). Please underline or circle those forms of energy that are “wasted”. You may use a diagram.
17. Choose one of the following renewable forms of energy and explain the energy transformations that occur when they are used to produce electricy: geothermal, wind, hydroelectric, tidal, or solar. You may use a diagram.
18. Susan stands at the edge of the diving board 3 meters above the surface of the water (height of zero). If she has a mass of 65 kg,
a) What is her PE standing on the board?
b) Susan has no speed in her standing position on the board, so what is her KE?
c) What is Susan’s total (mechanical) energy while she was on the board?
d) What is Susan’s KE just before she hits the water if she looses 200J of heat to air resistance? (Remember, conservation of energy)
e) What was Susan’s PE just before she hit the water? (hint: height = 0)
f) What was Susan’s Total/mechanical energy just before she hit the water?
19. A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the
baby weighs 24 lbs. (1kg = 2.2lbs) The carriage has _________________ energy. Calculate it.
20. The baby carriage above begins rolling down the hill. The bottom of the hill has a height of zero (thus no potential energy). If the stroller loses 50J of energy in heat and 75J of energy to sound as it rolls down, how fast will it be going at the bottom of the hill. You can stop it if it is going less than 15 miles per hour, would you be able to save the baby?
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