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Homework answers / question archive / Concordia University PHYS 273 1)Energy is: a)Power b)A force of nature c)Amount of momentum d) The ability to do work 2
Concordia University
PHYS 273
1)Energy is:
a)Power
b)A force of nature
c)Amount of momentum d) The ability to do work
2. If you double the speed of an object how does its kinetic energy change?
a) Stays the same
b) It doubles
c) It triples
d) It quadruples
3. Which of the following could NOT be a unit of power?
a) Joules per second
b) Watts
c) Calories per hour d) Joules
4. Home appliances that produce heat tend to be low power.
a) True b) False
5. A process that occurs spontaneously in one direction is called
a) Reversible b) Irreversible
c) Undeniable
d) Insatiable
6. Only a small percentage of the electricity we use in produced by converting mechanical energy into electrical energy
a) True b) False
7. Most countries depend on fossil fuels for more than 50% of their energy needs.
a) True
b) False
8. Energy use per person is much higher
a) In highly developed countries
b) In less developed countries
9. In which hemisphere are most of the known coal reserves found?
a) Northern
b) Southern
c) It is approximately equal
10. There hasn't been a major mining accident in canada since the 1970’s
a) True b) False
11. Light intensity is
a) The energy of the light on some area
b) The momentum of a light wave
c) The total energy of all the light captured
d) The power divided by the area over which the light shines
12. A flat plate collector is similar to the small solar panel in a calculator and takes the sun’s energy and turns it into useable electricity.
a) True b) False
13. In the future with better engineering we could have propellor style windmills with efficiencies of up to 75%
a) True b) False
14. Canada is one of the top 3 countries in terms of total power produced by wind
a) True b) False
15. Spent nuclear fuel has been used up and therefore is no longer radioactive.
a) True b) False
16. The total fraction of energy generated by nuclear power worldwide is predicted to increase by 2040.
a) True
b) False
17. A good home insulation will not be good at transferring heat.
a) True
b) False
18. The standard that certifies energy efficient products is called
a) Energy star
b) Green star
c) Canadenergy
d) GreenLite
19. What compound is produced by incomplete combustion of fossil carbon?
a) CO2 b) CO
c) NO2
d) N2
20. Which of the following is a primary pollutant?
a) SO2
b) SO3
c) Sulphuric Acid
21. In the last 100 years, overall, the average distribution of marine taxonomic groups has
a) Shifted towards colder water regions
b) Shifted towards warmer water regions
c) Not changed significantly
22. The ratio of different types of carbon in the atmosphere tells us
a) That the increase in atmospheric CO2 is from very old sources
b) That CO2 levels have increased since the 1800s
c) Nothing about the source of atmospheric CO2
23. A stabilization wedge is
a) A strategy that could correspond to no warming by 2050
b) A strategy that could correspond to about a 1 billion ton CO2 reduction by 2050
c) The amount of CO2 that is needed in order to have a stable temperature
d) A block of wood used to stop a door from closing
24. Climate change related changes in precipitation are predicted to
a) Be uniform
b) Increase precipitation in dry regions c) Increase precipitation in wet regions
25. Saying “the electromagnetic spectrum” is the same as saying “visible light”.
a) True b) False
26. How is the majority of electricity produced in Canada?
a) Solar
b) Coal
c) Uranium d) Hydro
27. Per BTU of energy, how does the cost of natural gas compare to the cost of gasoline?
a) Gasoline is about 4 times more expensive than natural gas.
b) Gasoline is about 2 times more expensive than natural gas.
c) Gasoline is about 2 times less expensive than natural gas.
d) Gasoline is about 4 times less expensive than natural gas.
28. Saying “the electromagnetic spectrum” is the same as saying “visible light”.
a) True b) False
29. The sun’s energy reaches Earth in the form of
a) Chemical energy
b) Thermal energy
c) Nuclear energy
d) Electrical energy
e) Electromagnetic energy
30 . A clothes dryer consumes 2500 watts of energy. In 2 seconds how much energy does the dryer use?
a) 2500 watts
b) 2500 joules
c) 5000 watts d) 5000 joules
31. You lift a cat from the ground up to a shelf 2 metres above the ground. Which is a description of the energy flow?
a) Thermal -> electrical
b) Thermal -> potential
c) Kinetic -> electromagnetic d) Chemical -> gravitational
32. Your little sister drops a bag of candy on your head from the roof of your house. Right before it hits your head it is moving quickly. Which describes the candy’s energy, from roof to head?
a) The candy has lost kinetic energy and gained potential energy b) The candy has lost potential energy and gained kinetic energy
c) The candy has not lost or gained potential energy
d) The candy has not lost or gained kinetic energy
33. Only a small percentage of the electricity we use is produced by converting mechanical energy into electrical energy
a) True b) False
34. A battery contains 1000 joules of energy. The maximum amount of work it can do is 1000 joules. This is an example of
a) The law of conservation of energy
b) The first law of thermodynamics
c) Neither the first law of thermodynamics nor the law of conservation of energy d) Both the first law of thermodynamics and the law of conservation of energy
35. In Canada from 2014-2040 which sector is expected to see the largest decrease in growth rate?
a) Residential
b) Commercial
c) Transportation
d) Industrial
36. Canada uses less energy per person than the U.S.
a) True b) False
37. Which countries have the highest percent use of renewable energy?
a) Low income countries
b) Middle income countries c) High income countries
38. In a structural trap oil is trapped between
a) A lower layer of porous rock and an upper layer of non-porous rock
b) Two layers of non-porous rock
c) An upper layer of porous rock and a lower layer of non-porous rock
d) Two layers of porous rock
39. On a clear day about how much of the light hitting the Earth makes it to the surface?
a) 14%
b) 24%
c) 44%
d) 34%
40. The intensity of sunlight at Mercury is greater than the intensity of sunlight at Venus because
a) Venus is larger
b) Mercury is closer to the sun
c) Mercury is larger
d) Venus is closer to the sun
41. Of the following could be used to store the heat from passive solar heating?
a) Solar panels
b) Containers of water
c) Photovoltaic solar cells
d) Reflective glass windows
42. The sun's energy is thought of as a renewable energy source because
a) Because the sun's energy is in the form of light making it environmentally friendly
b) We cannot capture and use all the energy from the sun c) Because the sun's lifetime is very long
d) The sun will last indefinitely
43. There are global regions which have not been affected by climate change.
a) False
b) True
44. Without humans there would be no greenhouse effect.
a) False
b) True
45. Today’s weather can tell us if climate change is real.
a) False
b) True
46. Greenhouse gasses are gasses that
a) Are transparent to both visible light and infrared light
b) Absorb both visible light and infrared light
c) Are transparent to visible light but absorb infrared light
d) Are transparent to infrared light but absorb visible light
47. A calorie is
a) The work done by a one newton force over one metre
b) Unit of energy that only applies to food
c) The amount of energy required to raise the temperature of one gram of water by one degree celsius
d) Amount of heat energy required to raise the temperature of one pound of water by one degree fahrenheit
48. Which of the following is an advantage of subsurface mining?
a) It is less expensive
b) It is faster
c) There is less of a surface impact
d) It is safer
49. When petroleum products are refined they get separated according to
a) Their viscosities
b) Their densities
c) Their colours
d) Their boiling points
50. Considering only the amount of solar energy available,in which region would it make the most sense to develop solar energy production?
a) Northern quebec
b) West coast of British Columbia
c) The maritime provinces d) Southern saskatchewan
51. If the total energy of a system increases this does not necessarily mean that energy was added to the system.
a) False
b) true
52. According to the Law of Conservation of Energy if solar panels use the sun’s energy in Arizona, then there will be less solar energy for us to use in canada.
a) True b) false
53. Hydraulic fracturing (or fracking) uses acids dissolved in water to breakdown the rock and release the hydrocarbons for extraction.
a) True
b) False
54. What fraction of canada’s 2015 electricity production was from solar energy?
a) 10%
b) 20%
c) 30%
d) 1%
55. What percentage of canada's energy consumption is in the form of alternative/nuclear energy?
a) About 25%
b) About 50%
c) Almost zero
d) About 75%
e) Almost all
56. Fossil fuels are not a renewable resource because
a) They are bad for the environment
b) They are hard to extract from earth
c) They cause too many emissions
d) They take 100s millions of years to produce
57. Which of the following is NOT a main product in the combustion of hydrocarbons?
a) Heat energy
b) Carbon dioxide
c) Water
d) Oxygen gas
58. Without a temperature difference between a heat source and heat sink, it is impossible to run a heat engine.
a) False b) True
59. The amount of energy released per 100 grams of fuel burned in a reaction is called
a) The latent heat
b) The reactions efficiency c) The heat of combustion
d) The heat of transformation
60. The sun's energy is produced by
a) Burning of hydrogen
b) Nuclear fission c) Nuclear fusion
61. The metric unit of energy is
a) The calorie
b) The BTU
c) The electron volt d) The Joule
62. The Law of Conservation of Energy
a) Is a possible means for extending fossil fuel use
b) Does not apply to earth systems
c) Is obeyed in chemical reactions but not nuclear reactions d) Is a fundamental law of physics with no known exceptions
63. Which region has the largest growth in coal consumption recently?
a) Europe
b) Africa c) asia
64. The “c” in E=mc2 refers to
a) The mass of light
b) An electric charge c) Speed of light
65. In an isolated system the entropy of the system increases over time
a) True
b) False
66. As entropy of a system increases, total amount of useful energy decreases.
a) True
b) False
67. In a system with is NOT isolated the total amount of energy must stay constant.
a) False
b) True
68. You are camping and you start a wood fire and use it to boil some water in a pot. What is the flow of energy?
(choose from Chemical, Thermal, Electrical, Nuclear, Electromagnetic, Kinetic)
Correct answer: *Chemical*Thermal*;
69. What percentage of Canada’s energy consumption is in the form if fossil fuels?
a. almost zero
b. about 25%
c. about 50% d. about 75%
e. almost all
70. You lift a cat from the ground up to a shelf 2 metres above the ground. Which is a description of the energy flow?
1. Thermal energy —> Electrical energy
2. Thermal energy —> Potential energy
3. Kinetic energy —> Electromagnetic energy
4. Chemical energy —> Gravitational potential energy
71. Which of the following is part of a home designed with passive solar heating?
a. a greenhouse
b. little insulation
c. south facing windows
d. use of solar collectors on the roof
e. mirrors and lenses
72. A chair is sliding across a rough horizontal floor. The chair starts with 100J of kinetic energy and slows down and comes to a stop. What happened to the kinetic energy of the chair?
a. Kinetic energy ever only lasts for short amounts of time.
b. The kinetic energy was transformed into heat due to the friction with the floor.
c. The kinetic energy was transformed into gravitational potential energy.
d. The chair’s kinetic energy did not change.
73. Which of the following is NOT a main product in the combustion of hydrocarbons?
1. heat energy 2. oxygen gas
3. carbon dioxide
4. Water
74. Only a small percentage of the electricity we use is produced by converting mechanical energy into electrical energy
1. True 2. False
75. For heat engines, the larger the temperature difference between the heat source and the heat sink, the higher the best possible efficiency.
1. True
2. False
76. Entropy never spontaneously increases.
1. False
2. True
77. In Canada from 2014-2040 which sector is expected to see the largest decrease in growth rate?
1. Industrial
2. Commercial
3. Residential
4. Transportation
78. Per BTU of energy, how does the cost of natural gas compare to the cost of gasoline?
1. Gasoline is about 4 times less expensive than natural gas. 2. Gasoline is about 2 times more expensive than natural gas.
3. Gasoline is about 4 times more expensive than natural gas.
4. Gasoline is about 2 times less expensive than natural gas.
79. The sun's energy is thought of as a renewable energy source because
1. we cannot capture and use all the energy from the sun.
2. because the sun will last indefinitely.
3. because the sun’s energy is in the form of light making it environmentally friendly.
4. because the sun’s lifetime is very very long.
80. Considering only the amount of solar energy available, in which region would it make the most sense to develop solar energy production?
1. Southern Saskatchewan
2. Northern Quebec
3. West coast of British Columbia
4. The maritime provinces
81. Which of the following is NOT a factor that will decrease the amount of time that the world’s oil supply might last?
a. World energy demand is increasing.
b. Demand is increasing faster than the growth of alternative energy. c. We will not discover new oil reserves in the future.
d. Most oil reserves are in decline.
82. Power is
a. the amount of energy.
b. the rate at which energy is produced or consumed.
c. measured in joules.
d. not well defined in physics.
83. Tight resources are oil and natural gas deposits that are
a. not accessible until will develop better technology for extraction.
b. difficult to access due to surface conditions.
c. much deeper than conventional oil resources.
d. not extractable by conventional drilling methods.
84. Which of the following areas in Canada has the least wind energy infrastructure?
a. The west coast.
b. Southern Ontario.
c. The east coast.
d. Southern Alberta.
85. Which of the following is not major negative impact of the operation of hydroelectric dams?
a. Risk of downstream flooding.
b. Loss of free flowing rivers.
c. Loss of soil nutrients. d. CO2 emissions.
86. Spent nuclear fuel has been used up and therefore is no longer radioactive.
a. False
b. True
87. Starting with energy production in the sun, choose the correct forms of energy to complete the energy flow description for an active solar system? X
→ Y → Z
Nuclear-> electromagnetic._ thermal
88. All electric heating systems do not depend on fossil fuels for energy production.
a. False b. True
89. According to a Nuclear Regulatory Commission study what is the probability that one of the 104 reactors operating in the U.S. will have a large release incident over its 30 year lifetime?
a. about 50% b.about 30% c.about 1% d.about 10%
90. According to current projections the total amount of electricity produced through nuclear power in Canada by 2040 will
A. stay at the current level. B. decrease.
C. increase.
91. The upfront costs of geothermal plants are high.
1. False 2. True
92. The earth is able to reach energy balance because:
a. The suns earth cycle makes it warmer and cooler
b. There is the same energy radiated as reflected
c. The energy radiated away from the earth decreases as the earth’s temperature increases.
d. The energy radiated away from the earth increases as the earths temperature increases
93. The most abundant air pollutant is
a. nitrogen oxides.
b. volatile organics.
c. carbon monoxide.
d. particulates.
94. Greenhouse gases
a. absorb much less outgoing radiation from the Earth than incoming radiation from the sun.
b. absorb the same amount to outgoing radiation from the Earth as incoming radiation from the sun.
c. absorb much more outgoing radiation from the Earth than incoming radiation from the sun.
95. Continuing on our current path of CO2 emissions would result in mean global temperature increase by 2100 (relative to about 1880) of about
a. 5?
b. 2?
c. 10?
D. 1?
96. The most important factor in the mitigation of climate change is
a. reduction of pollution.
b. getting a better understanding of climate models.
c. getting a better understanding of the greenhouse effect. d. reduction of CO2 emissions.
97. Climate change is predicted to
a. reduce the total productivity of fisheries in almost all regions.
b. affect productivity of fisheries uniformly over most regions. c. reduce global marine biodiversity.
98. Almost all air pollutant emissions are currently the highest they have been in the last 15 years.
a. False
b. True
99.A heat pump uses electricity
a. to generate heat.
b. to run a small compressor.
c. to burn fuel.
100. Energy efficient light bulbs are about 50% more efficient than standard light bulbs.
a. False
b. True
101. A battery contains 1000 joules of energy. The maximum amount of work it can do is 1000 joules. This is an example of
a. the Law of Conservation of Energy.
b. the First Law of Thermodynamics.
c. neither the First Law of Thermodynamics nor the Law of Conservation of Energy.
d. both the First Law of Thermodynamics and the Law of Conservation of Energy.
102. What percentage of crude oil production is offshore? a. 70%
b. 50%
c. 30%
d. 10
103. The main concern for hydraulic fracturing activities is the effects on
a. Air quality
b. Carbon dioxide levels
c. worker safety
d. water and water system
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