Question 1

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

Accepted Answer

A)  B 
B)  Al 
C)  Sb 
D)  C 
E)  b 
A)  B 
B)  Al 
C)  Sb 
D)  C 
E)  b C

Question 2

Which of the following are disadvantages of wind power?
I. Wind farms use large portions of land, which cannot be used for other purposes.
II. Wind farms are undependable since winds are not always present when needed.
III. Wind power generation is extremely expensive and hence not cost competitive with other fuels.
IV. Wind power is nonrenewable; once it is used up, it cannot be replenished.

Accepted Answer

A)  I and IV 
B)  II and IV 
C)  I and III 
D)  I and II 
E)  I, II, and III 
A)  I and IV 
B)  II and IV 
C)  I and III 
D)  I and II 
E)  I, II, and III D

Question 3

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

Accepted Answer

A)  It has limited availability. 
B)  Vented steam usually contains sulfurous and ammonia gases. 
C)  Global warming occurs because of the high levels of CO  2  produced. 
D)  Condensed steam from Earth's crust is corrosive to mechanical parts . 
E)  All of these are problems associated with geothermal energy . 
A)  It has limited availability. 
B)  Vented steam usually contains sulfurous and ammonia gases. 
C)  Global warming occurs because of the high levels of CO  2  produced. 
D)  Condensed steam from Earth's crust is corrosive to mechanical parts . 
E)  All of these are problems associated with geothermal energy . C

Question 4

What percentage of energy is consumed for transportation in the United States?

Accepted Answer

A)  10% 
B)  25% 
C)  50% 
D)  75% 
E)  85% 
A)  10% 
B)  25% 
C)  50% 
D)  75% 
E)  85%

Question 5

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

Accepted Answer

A)  As 
B)  Sb 
C)  P 
D)  B 
E)  Se 
A)  As 
B)  Sb 
C)  P 
D)  B 
E)  Se

Question 6

Which of the following consumes the least amount of electricity per year?

Accepted Answer

A)  Television 
B)  Dishwashers 
C)  Refrigerators 
D)  DVDs 
E)  Hot tubs 
A)  Television 
B)  Dishwashers 
C)  Refrigerators 
D)  DVDs 
E)  Hot tubs

Question 7

Which of the following alternative energy sources is considered renewable?

Accepted Answer

A)  Biomass energy 
B)  Solar energy 
C)  Hydroelectric power 
D)  Wind energy 
E)  All of these 
A)  Biomass energy 
B)  Solar energy 
C)  Hydroelectric power 
D)  Wind energy 
E)  All of these

Question 8

Which of the following is not a commercial application of photovoltaic cells?

Accepted Answer

A)  Night lights 
B)  Highway call boxes 
C)  Watches 
D)  Cell phones 
E)  Calculators 
A)  Night lights 
B)  Highway call boxes 
C)  Watches 
D)  Cell phones 
E)  Calculators

Question 9

Which of the following nonfissionable substances can be converted to fissionable Pu-239 in a breeder reactor?

Accepted Answer

A)  U-238 
B)  C-14 
C)  Si-14 
D)  H-3 
E)  O-17 
A)  U-238 
B)  C-14 
C)  Si-14 
D)  H-3 
E)  O-17

Question 10

Photovoltaic cells convert light into electricity without _____.

Accepted Answer

A)  moving parts 
B)  noise 
C)  pollution 
D)  moving parts and noise 
E)  moving parts, noise, and pollution 
A)  moving parts 
B)  noise 
C)  pollution 
D)  moving parts and noise 
E)  moving parts, noise, and pollution

Question 11

What is the efficiency of a solar system that uses a focusing system covering an area of 300 m  2  and produces 50 kW of power? The solar power available is 900 W/m  2  .

Accepted Answer

A)  2.09% 
B)  18.52% 
C)  54.67% 
D)  81.52% 
E)  94.80% 
A)  2.09% 
B)  18.52% 
C)  54.67% 
D)  81.52% 
E)  94.80%

Question 12

Which of the following two methods are used for obtaining energy from plants?

Accepted Answer

A)  Extraction of liquid fuels and photochemistry 
B)  Burning and extraction of H2O for fuel cells 
C)  Burning and extraction of solar energy 
D)  Burning and extraction of liquid fuels 
E)  Photochemistry and burning 
A)  Extraction of liquid fuels and photochemistry 
B)  Burning and extraction of H2O for fuel cells 
C)  Burning and extraction of solar energy 
D)  Burning and extraction of liquid fuels 
E)  Photochemistry and burning

Question 13

How many square meters of photovoltaic cells would be required to run a 11-W compact disc player? The efficiency of photovoltaic cells is 15% for converting 1000 W/m  2  of solar energy to electricity.

Accepted Answer

A)  1.1 × 10 − 3 m2 
B)  0.073 m2 
C)  14 m2 
D)  20 m2 
E)  75 m2 
A)  1.1 × 10 − 3 m2 
B)  0.073 m2 
C)  14 m2 
D)  20 m2 
E)  75 m2

Question 14

What is the efficiency of a solar system that uses a focusing system covering an area of 100 m  2  and produces 40 kW of power? The solar power available is 1000 W/m  2  .

Accepted Answer

A)  20% 
B)  40% 
C)  60% 
D)  88% 
E)  94% 
A)  20% 
B)  40% 
C)  60% 
D)  88% 
E)  94%

Question 15

Which of the following systems use(s) the heliostats to focus the Sun's energy on molten salt water for creating steam?
I. Solar power tower
II. Parabolic trough
III. Dish/engine

Accepted Answer

A)  I only 
B)  II only 
C)  I, II, and III 
D)  I and II 
E)  I and III 
A)  I only 
B)  II only 
C)  I, II, and III 
D)  I and II 
E)  I and III

Question 16

Which of the following forms of energy uses heliostats to focus the energy of the Sun?

Accepted Answer

A)  Solar thermal energy 
B)  Wind energy 
C)  Hydroelectric power 
D)  Biomass energy 
E)  Geothermal energy 
A)  Solar thermal energy 
B)  Wind energy 
C)  Hydroelectric power 
D)  Biomass energy 
E)  Geothermal energy

Question 17

Which of the following is/are currently the most cost competitive in creating fuel to replace fossil fuels?
I. Solar power tower
II. Parabolic trough
III. Dish/engine

Accepted Answer

A)  I only 
B)  II only 
C)  I, II, and III 
D)  I and II 
E)  I and III 
A)  I only 
B)  II only 
C)  I, II, and III 
D)  I and II 
E)  I and III

Question 18

Which of the following will not lead to the conservation of household energy?

Accepted Answer

A)  Electric heaters 
B)  Lowering thermostats 
C)  Using fluorescent lighting 
D)  Installing double-pane windows 
E)  All of these 
A)  Electric heaters 
B)  Lowering thermostats 
C)  Using fluorescent lighting 
D)  Installing double-pane windows 
E)  All of these

Question 19

Which of the following is the product of hydrogen combustion?

Accepted Answer

A)  Methane 
B)  Water 
C)  Oxygen 
D)  Carbon dioxide 
E)  Ethanol 
A)  Methane 
B)  Water 
C)  Oxygen 
D)  Carbon dioxide 
E)  Ethanol

Question 20

Which of the following are not an application of photovoltaic cells?
I. Solar cars
II. Battery chargers
III. Satellite and space industry
IV. Calculators

Accepted Answer

A)  I and II 
B)  I and III 
C)  I, II, and III 
D)  I, III, and IV 
E)  All of these 
A)  I and II 
B)  I and III 
C)  I, II, and III 
D)  I, III, and IV 
E)  All of these

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

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

What percentage of energy is consumed for transportation in the United States?

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

Which of the following consumes the least amount of electricity per year?

Which of the following alternative energy sources is considered renewable?

Which of the following is not a commercial application of photovoltaic cells?

Which of the following nonfissionable substances can be converted to fissionable Pu-239 in a breeder reactor?

Photovoltaic cells convert light into electricity without _____.

What is the efficiency of a solar system that uses a focusing system covering an area of 300 m ² and produces 50 kW of power? The solar power available is 900 W/m ² .

Which of the following two methods are used for obtaining energy from plants?

How many square meters of photovoltaic cells would be required to run a 11-W compact disc player? 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 a focusing system covering an area of 100 m ² and produces 40 kW of power? The solar power available is 1000 W/m ² .

Which of the following systems use(s) the heliostats to focus the Sun's energy on molten salt water for creating steam? I. Solar power tower II. Parabolic trough III. Dish/engine

Which of the following forms of energy uses heliostats to focus the energy of the Sun?

Which of the following is/are currently the most cost competitive in creating fuel to replace fossil fuels? I. Solar power tower II. Parabolic trough III. Dish/engine

Which of the following will not lead to the conservation of household energy?

Which of the following is the product of hydrogen combustion?

Which of the following are not an application of photovoltaic cells? I. Solar cars II. Battery chargers III. Satellite and space industry IV. Calculators

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Molecules, Compounds, and Chemical Reactions

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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

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

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

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

What percentage of energy is consumed for transportation in the United States?

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

Which of the following consumes the least amount of electricity per year?

Which of the following alternative energy sources is considered renewable?

Which of the following is not a commercial application of photovoltaic cells?

Which of the following nonfissionable substances can be converted to fissionable Pu-239 in a breeder reactor?

Photovoltaic cells convert light into electricity without _____.

What is the efficiency of a solar system that uses a focusing system covering an area of 300 m 2 and produces 50 kW of power? The solar power available is 900 W/m 2 .

Which of the following two methods are used for obtaining energy from plants?

How many square meters of photovoltaic cells would be required to run a 11-W compact disc player? 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 a focusing system covering an area of 100 m 2 and produces 40 kW of power? The solar power available is 1000 W/m 2 .

Which of the following systems use(s) the heliostats to focus the Sun's energy on molten salt water for creating steam? I. Solar power tower II. Parabolic trough III. Dish/engine

Which of the following forms of energy uses heliostats to focus the energy of the Sun?

Which of the following is/are currently the most cost competitive in creating fuel to replace fossil fuels? I. Solar power tower II. Parabolic trough III. Dish/engine

Which of the following will not lead to the conservation of household energy?

Which of the following is the product of hydrogen combustion?

Which of the following are not an application of photovoltaic cells? I. Solar cars II. Battery chargers III. Satellite and space industry IV. Calculators

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

What is the efficiency of a solar system that uses a focusing system covering an area of 300 m ² and produces 50 kW of power? The solar power available is 900 W/m ² .

How many square meters of photovoltaic cells would be required to run a 11-W compact disc player? 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 a focusing system covering an area of 100 m ² and produces 40 kW of power? The solar power available is 1000 W/m ² .