Question 1

Which of the following is not a problem associated with utilizing solar energy?

Accepted Answer

A)  Low concentration of solar energy supply 
B)  Low efficiency of solar cells for collecting solar energy 
C)  High costs associated with constructing solar technologies 
D)  Hazardous wastes associated with solar cell decomposition 
E)  Nonrenewable nature of solar energy 
A)  Low concentration of solar energy supply 
B)  Low efficiency of solar cells for collecting solar energy 
C)  High costs associated with constructing solar technologies 
D)  Hazardous wastes associated with solar cell decomposition 
E)  Nonrenewable nature of solar energy

Question 2

What percentage of energy is lost by burning natural gas to produce electricity for heating a house?

Accepted Answer

A)  10% 
B)  30% 
C)  50% 
D)  70% 
E)  90% 
A)  10% 
B)  30% 
C)  50% 
D)  70% 
E)  90%

Question 3

Which of the following processes is representative of the given equation? Energy + 2H2O → 2H2 + O2

Accepted Answer

A)  Photosynthesis 
B)  Electrolysis 
C)  Hydrolysis 
D)  Respiration 
E)  Combustion 
A)  Photosynthesis 
B)  Electrolysis 
C)  Hydrolysis 
D)  Respiration 
E)  Combustion

Question 4

Which of the following household appliances consumes the highest amount of electricity per year?

Accepted Answer

A)  Television 
B)  Stereos 
C)  Refrigerators 
D)  Coffee makers 
E)  Dishwashers 
A)  Television 
B)  Stereos 
C)  Refrigerators 
D)  Coffee makers 
E)  Dishwashers

Question 5

Which of the following processes is representative of the given equation?
​
Sunlight + 6CO2 + 6H2O → C6H12O6 + 6O2

Accepted Answer

A)  Photosynthesis 
B)  Electrolysis 
C)  Hydrolysis 
D)  Respiration 
E)  Combustion 
A)  Photosynthesis 
B)  Electrolysis 
C)  Hydrolysis 
D)  Respiration 
E)  Combustion

Question 6

Which of the following is the correct notation for an electron-deficient semiconductor?

Accepted Answer

A)  p/n-type 
B)  p-type 
C)  n-type 
D)  n/p-type 
E)  None of these 
A)  p/n-type 
B)  p-type 
C)  n-type 
D)  n/p-type 
E)  None of these

Question 7

A solar system uses a focusing system that covers 135 m  2  and produces a power of 41.0 kW approximately. If the solar power available is 1000 W/m  2  , the efficiency of the solar system is _____.

Accepted Answer

A)  1.82% 
B)  14.34% 
C)  30.37% 
D)  55.21% 
E)  94.10% 
A)  1.82% 
B)  14.34% 
C)  30.37% 
D)  55.21% 
E)  94.10%

Question 8

When added to silicon, which of the following dopants would result in an electron-rich semiconductor?

Accepted Answer

A)  B 
B)  Al 
C)  Ge 
D)  C 
E)  P 
A)  B 
B)  Al 
C)  Ge 
D)  C 
E)  P

Question 9

Which of the following is not a fuel for vehicles?

Accepted Answer

A)  Hydrogen 
B)  Ethanol 
C)  Solar power 
D)  A fuel cell 
E)  None of these 
A)  Hydrogen 
B)  Ethanol 
C)  Solar power 
D)  A fuel cell 
E)  None of these

Question 10

Which of the following statements about the Sun is incorrect ?

Accepted Answer

A)  The Sun radiates 10  26  watts of energy constantly into space. 
B)  Earth receives approximately 1 part per billion of the Sun's energy. 
C)  The main advantage of solar energy is that it has higher concentrated energy content than fossil fuels. 
D)  The significant obstacle in using solar energy is its relatively low concentration. 
E)  One of the obstacles in using solar energy is its cost. 
A)  The Sun radiates 10  26  watts of energy constantly into space. 
B)  Earth receives approximately 1 part per billion of the Sun's energy. 
C)  The main advantage of solar energy is that it has higher concentrated energy content than fossil fuels. 
D)  The significant obstacle in using solar energy is its relatively low concentration. 
E)  One of the obstacles in using solar energy is its cost.

Question 11

In the year 2050, about half of the power produced in nuclear fusion reactors would be used for electricity production and the other half would be used for creating _____.

Accepted Answer

A)  ethanol fuel 
B)  biofuel 
C)  fossil fuel 
D)  hydrogen fuel 
E)  methanol fuel 
A)  ethanol fuel 
B)  biofuel 
C)  fossil fuel 
D)  hydrogen fuel 
E)  methanol fuel

Question 12

Which of the following is an environmental problem associated with hydroelectric power?

Accepted Answer

A)  Flooding of upstream canyons 
B)  Reduced nutrient flow downstream 
C)  Interrupted spawning patterns of fish 
D)  Destruction of naturally majestic wilderness 
E)  All of these 
A)  Flooding of upstream canyons 
B)  Reduced nutrient flow downstream 
C)  Interrupted spawning patterns of fish 
D)  Destruction of naturally majestic wilderness 
E)  All of these

Question 13

Solar power towers use Sun-tracking mirrors called _____.

Accepted Answer

A)  reflectometers 
B)  heliostats 
C)  receivers 
D)  condensers 
E)  turbines 
A)  reflectometers 
B)  heliostats 
C)  receivers 
D)  condensers 
E)  turbines

Question 14

Hydroelectric power currently generates approximately _____ of the electricity in the United States.

Accepted Answer

A)  5% 
B)  42% 
C)  16% 
D)  70% 
E)  7% 
A)  5% 
B)  42% 
C)  16% 
D)  70% 
E)  7%

Question 15

Calculate the percentage efficiency of a solar power tower with an active area of 15 m2 and a production capacity of 5.5 kW of power. The solar power falling on the active area is 1 kW/m2.

Accepted Answer

A)  36.67% 
B)  66.67% 
C)  60% 
D)  20% 
E)  25.37% 
A)  36.67% 
B)  66.67% 
C)  60% 
D)  20% 
E)  25.37%

Question 16

Which of the following is the most common type of semiconductor found in photovoltaic cells?

Accepted Answer

A)  Arsenic 
B)  Carbon 
C)  Uranium 
D)  Silicon 
E)  Hydrogen 
A)  Arsenic 
B)  Carbon 
C)  Uranium 
D)  Silicon 
E)  Hydrogen

Question 17

How many square meters of photovoltaic cells would be required to light a 100-W bulb? The efficiency of photovoltaic cells is 15% for converting 1000 W/m  2  of solar energy to electricity.

Accepted Answer

A)  6.6 × 10 − 1 m2 
B)  15 m2 
C)  67 m2 
D)  200 m2 
E)  275 m2 
A)  6.6 × 10 − 1 m2 
B)  15 m2 
C)  67 m2 
D)  200 m2 
E)  275 m2

Question 18

Space heating accounts for approximately _____ of energy use in an average U.S. household.

Accepted Answer

A)  10% 
B)  20% 
C)  30% 
D)  41.5% 
E)  50% 
A)  10% 
B)  20% 
C)  30% 
D)  41.5% 
E)  50%

Question 19

Hydroelectric power currently generates approximately _____ of the electricity in the United States.

Accepted Answer

A)  5% 
B)  42% 
C)  16% 
D)  70% 
E)  7% 
A)  5% 
B)  42% 
C)  16% 
D)  70% 
E)  7%

Question 20

What is the efficiency of a solar system that uses 75 heliostats with an area of 3.0 m  2  and produces 25 kW of power? The solar power available is 1100 W/m  2  .

Accepted Answer

A)  10.10% 
B)  20.02% 
C)  30.30% 
D)  45.10% 
E)  90.03% 
A)  10.10% 
B)  20.02% 
C)  30.30% 
D)  45.10% 
E)  90.03%

Which of the following is not a problem associated with utilizing solar energy?

What percentage of energy is lost by burning natural gas to produce electricity for heating a house?

Which of the following processes is representative of the given equation? Energy + 2H₂O → 2H₂ + O₂

Which of the following household appliances consumes the highest amount of electricity per year?

Which of the following processes is representative of the given equation? Sunlight + 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Which of the following is the correct notation for an electron-deficient semiconductor?

A solar system uses a focusing system that covers 135 m ² and produces a power of 41.0 kW approximately. If the solar power available is 1000 W/m ² , the efficiency of the solar system is _____.

When added to silicon, which of the following dopants would result in an electron-rich semiconductor?

Which of the following is not a fuel for vehicles?

Which of the following statements about the Sun is incorrect ?

In the year 2050, about half of the power produced in nuclear fusion reactors would be used for electricity production and the other half would be used for creating _____.

Which of the following is an environmental problem associated with hydroelectric power?

Solar power towers use Sun-tracking mirrors called _____.

Hydroelectric power currently generates approximately _____ of the electricity in the United States.

Calculate the percentage efficiency of a solar power tower with an active area of 15 m² and a production capacity of 5.5 kW of power. The solar power falling on the active area is 1 kW/m².

Which of the following is the most common type of semiconductor found in photovoltaic cells?

How many square meters of photovoltaic cells would be required to light a 100-W bulb? The efficiency of photovoltaic cells is 15% for converting 1000 W/m ² of solar energy to electricity.

Space heating accounts for approximately _____ of energy use in an average U.S. household.

Hydroelectric power currently generates approximately _____ of the electricity in the United States.

What is the efficiency of a solar system that uses 75 heliostats with an area of 3.0 m ² and produces 25 kW of power? The solar power available is 1100 W/m ² .

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Exam 10: Energy for Tomorrow: Solar and Other Renewable Energy Sources

Which of the following is not a problem associated with utilizing solar energy?

What percentage of energy is lost by burning natural gas to produce electricity for heating a house?

Which of the following processes is representative of the given equation? Energy + 2H2O → 2H2 + O2

Which of the following household appliances consumes the highest amount of electricity per year?

Which of the following processes is representative of the given equation? ​ Sunlight + 6CO2 + 6H2O → C6H12O6 + 6O2

Which of the following is the correct notation for an electron-deficient semiconductor?

A solar system uses a focusing system that covers 135 m 2 and produces a power of 41.0 kW approximately. If the solar power available is 1000 W/m 2 , the efficiency of the solar system is _____.

When added to silicon, which of the following dopants would result in an electron-rich semiconductor?

Which of the following is not a fuel for vehicles?

Which of the following statements about the Sun is incorrect ?

In the year 2050, about half of the power produced in nuclear fusion reactors would be used for electricity production and the other half would be used for creating _____.

Which of the following is an environmental problem associated with hydroelectric power?

Solar power towers use Sun-tracking mirrors called _____.

Hydroelectric power currently generates approximately _____ of the electricity in the United States.

Calculate the percentage efficiency of a solar power tower with an active area of 15 m2 and a production capacity of 5.5 kW of power. The solar power falling on the active area is 1 kW/m2.

Which of the following is the most common type of semiconductor found in photovoltaic cells?

How many square meters of photovoltaic cells would be required to light a 100-W bulb? The efficiency of photovoltaic cells is 15% for converting 1000 W/m 2 of solar energy to electricity.

Space heating accounts for approximately _____ of energy use in an average U.S. household.

Hydroelectric power currently generates approximately _____ of the electricity in the United States.

What is the efficiency of a solar system that uses 75 heliostats with an area of 3.0 m 2 and produces 25 kW of power? The solar power available is 1100 W/m 2 .

Molecular Reasons

The Chemists Toolbox

Atoms and Elements

Molecules, Compounds, and Chemical Reactions

Chemical Bonding

Organic Chemistry

Light and Color

Nuclear Chemistry

Energy for Today

The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

Oxidation and Reduction

The Chemistry of Household Products

Biochemistry and Biotechnology

Drugs and Medicine: Healing, Helping, and Hurting

The Chemistry of Food

Nanotechnology Online Only

Filters

Which of the following processes is representative of the given equation? Energy + 2H₂O → 2H₂ + O₂

Which of the following processes is representative of the given equation? Sunlight + 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

A solar system uses a focusing system that covers 135 m ² and produces a power of 41.0 kW approximately. If the solar power available is 1000 W/m ² , the efficiency of the solar system is _____.

Calculate the percentage efficiency of a solar power tower with an active area of 15 m² and a production capacity of 5.5 kW of power. The solar power falling on the active area is 1 kW/m².

How many square meters of photovoltaic cells would be required to light a 100-W bulb? The efficiency of photovoltaic cells is 15% for converting 1000 W/m ² of solar energy to electricity.

What is the efficiency of a solar system that uses 75 heliostats with an area of 3.0 m ² and produces 25 kW of power? The solar power available is 1100 W/m ² .