Physics 018 Practice Final
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Physics 018 Practice Final
This test includes spare paper for calculations. No other papers, books, phones, tablets or
computers allowed. Calculators (not on your phone) are allowed. Scantrons will be provided.
quanity rate =
time
PE = mgh
Q = mcΔT
Power = 
KE = 
mv2
Th − Tc
d
Th − Tc
Drag = 
CρAv2
T(Kelvin) = T(Celsius)+ 273
1. What is the approximate number of hydrogen atoms for every carbon atom in natural gas?
a. 1 b. 2 c. 4 d. 8
2. Approximately how much less carbon dioxide is created when burning natural gas,
compared to coal (when creating the same amount of primary energy)?
a. 1/2 b. 1/4 c. 1/10 d . 1/100
3. The approximate efficiency of coal power plants in converting primary energy into electrical
energy is about ~32% . What is the approximate efficiency of combined cycle natural gas
power plants?
a. 12% b. 24% c. 32% c. 60%
4. What is this molecule a primary constituent of:
a. Coal b. Natural Gas c. Gasoline d. Nuclear Fuel
5. A diesel engine is an example of what type of engine:
a. combined cycle b. Carnot c. spark ignition d. compression ignition
6. The negative environmental impacts of diesel engines relative to other car engines is:
a. more radiation b. more particulates c. more CO2 d. more acid rain
7. The Supreme Court ruled in 2009 that carbon dioxide can be regulated under the Clean Air
Act . Is that still true today?
a. Yes b. No
8. Approximately how long did it take for our fossil fuels to form and accumulate?
a. 1,000 years b. 100,000 years c. 100,000,000 years
9. What fraction of naturally occurring uranium is fissile?
a. 0.7% b. 99.3% c. 32% c. 64%
10. When a Uranium-235 atom is split it emits all of the following except:
a. smaller atoms b. energy c. neutrons d. carbon dioxide
11. Which kills more people per year per MWh (on average)?
a. coal b. nuclear c. solar
12. What is the typical efficiency of photovoltaic solar panels in converting sunlight to electricity?
a. 1% b. 5% c. 20% d. 85%
13. What is not a primary environmental concern of silicon photovoltaic solar panels?
a. greenhouse gas emissions b. energy required to produce them c. land use
14. UC Riverside used 1.5x1011 Wh of electrical energy last year. The solar panels above and
north of lot 30 produce about 8 .0x106 W when the Sun is overhead . Assume a capacity
factor of 0.2. What percentage of the campus electrical energy is produced by the solar
farm?
a. 1% b. 4% c. 9.3% d. 22%
15. Which produces more of California’s electrical energy per year?
a. wind b. solar c. About the same
a. v b. v2 c. v3 d. v4
17. For a typical wind turbine, if the wind speed doubles, the produced power increases by a
a. 2 b. 4 c. 8 d. 16
18. What is the primary advancement allowing cheaper wind power?
a. cheaper labor b. more and smaller wind turbines c. larger wind turbines
19. Which of these regions is NOT particularly good for wind power in the US?
a. mountain passes in CA b. the Southeast c. the great plains (Dakotas/Iowa)
20. Are biofuels more or less efficient than solar panels in producing power per unit area?
a. more b. less c. the same
21. What is the best use for biofuels in the future?
a. replacing car gasoline b. producing electricity c. aviation fuel d. home heating
22. At what time of day is our typical peak electrical power demand
a. midnight b. morning c. noon d. Afternoon/evening
23. Which threshold did the atmospheric CO2 levels recently reach (in parts per million)?.
a. 275 b. 350 c. 420 d. 500
24. Greenhouse gases primarily absorb what kind of light?
a. visible b. infrared c. neither
25. A 2017 Chevy Bolt has a 60 kWh battery. If it charges in 2 hours, what is the average power supplied by the outlet?
a. 15 kW b. 30 kW c. 60 kW d. 120 kW
26. I want to power a 10 W LED light bulb for 2 hours. How much energy is that in Joules (if 1 Wh = 3600 J)?
a. 3,600 b. 7,200 c. 36,000 d. 72,000
27. I want to supply the energy from the previous question (answer = 72,000 J) using the
gravitational potential energy of a 50 kg rock . How high do I have to raise the rock to store
enough energy?
a. 0.08 m b. 8 m c. 1.44 m d. 144 m e. 1000 m
28. The walls in my home currently have an R-value of 6. If I upgrade to R-value = 12
insulation, what are my new heating/cooling costs compared to the previous costs?
a. same as original b. 1/4 c. 1/3 d. 1/2 e. 4/5
29. Assume that there is no friction in the gears, axles, wheels of a car. If you have enough gas
to drive 100 miles at 100 miles per hour, how far can you drive if you instead drove 50 miles
per hour?
a. 100 miles b. 200 miles c. 250 miles d. 400 miles
30. If the wind increases from 8 m/s to 16 m/s, by how much does the wind power produced by a windmill increase?
a. 2 times. b. 4 times c. 8 times d. 16 times
31. Which of these is not an example of a heat engine?
a. An internal combustion engine of a car b. A natural gas turbine c. A wind turbine
32. A heat pump produces more heat for the same amount of electricity as a space heater
(which uses “resistance” heat from running an electrical current through a wire) .
a . True b . False
33. A heat pump is more efficient when the difference between outdoor and indoor air is small .
a. True b. False
34. The primary segment(s) of our society that we can move to electrical energy (from fossil fuels) are:
a. Space heating b. Transportation c. Water heating d. All of the above.
2022-12-07