Unit Review

Question 1 of 15

The _____________ is the main source of renewable energy.

A. Wind

B. Ocean

C. Sun

D. Earth's core

Question 2 of 15

Which statement about solar ponds is true?

A. A solar pond is a type of solar thermal system.

B. The density gradient of a solar pond disrupts the normal convection current.

C. Disrupting the normal convection current establishes a temperature gradient in a solar pond.

D. All of the above

Question 3 of 15

The sun gets its energy from ________ .

A. Nuclear fusion

B. Burning hydrogen

C. The release of neutrons

D. Nuclear fission

Question 4 of 15

Which material has the greatest thermal mass?

A. Glass

B. Stone

C. Wood

D. Styrofoam

Question 5 of 15

Which type of energy is not present in an incandescent light bulb?

A. Electrical

B. Thermal

C. Mechanical

D. Electromagnetic

Question 6 of 15

Solar cells use which wavelength of the electromagnetic spectrum?

A. Ultraviolet

B. Visible light

C. Infrared

D. All wavelengths

Question 7 of 15

The amount of incoming radiation that reaches earth's surface can vary due to _____.

A. The reflective ability of the earth's surface

B. The amount of water vapor in the air

C. The height of the atmosphere

D. All of the above

Question 8 of 15

Which statement about radiant energy is true?

A. When radiant energy is absorbed by an object, the molecules in the object move more energetically.

B. When radiant energy is absorbed by an object, the object's temperature increases.

C. All forms of radiation are basically the same.

D. All of the above

Question 9 of 15

Solar energy striking the Earth averages 200W/m². If solar cells are 10 percent efficient, what size solar cell would you need to power a 100-watt light bulb?

A. 2 m²

B. 5 m²

C. 10 m²

D. 20 m²

Question 10 of 15

A typical concentrated solar power plant requires about 5 acres of land for every megawatt of generating capacity. By this standard, about how much land might a 100 MW solar plant need?

A. ~5 acres

B. ~5 square miles

C. ~1 square mile

D. ~50 acres

Question 11 of 15

When two photovoltaic modules are wired in parallel, _____.

A. Their current is doubled and the voltage stays the same

B. Their current stays the same and the voltage doubles

C. Both current and voltage stay the same

D. Both current and voltage double

Question 12 of 15

Solar cells put out what type of current?

A. Alternating current

B. Direct current

C. Fluctuating current

D. Resistive current

Question 13 of 15

How does alternating current (AC) differ from direct current (DC)?

A. AC current changes direction in the circuit at regular intervals.

B. AC is used in the Northern Hemisphere and DC is used in the Southern Hemisphere.

C. AC alternates from high voltage to low voltage; DC stays the same.

D. AC alternates from high amperage to low amperage; DC stays the same.

Question 14 of 15

Which type of circuit is illustrated in the diagram?

A. Parallel circuit

B. Series circuit

C. Combination series and parallel circuit

D. Direct circuit

Question 15 of 15

This diagram is an example of __________.

A. A passive solar system

B. An active solar system

C. A solar fuel cell

D. A solar/chemical hybrid system

Unit Review

Question 1 of 15

The _____________ is the main source of renewable energy.

Question 2 of 15

Which statement about solar ponds is true?

Question 3 of 15

The sun gets its energy from ________ .

Question 4 of 15

Which material has the greatest thermal mass?

Question 5 of 15

Which type of energy is not present in an incandescent light bulb?

Question 6 of 15

Solar cells use which wavelength of the electromagnetic spectrum?

Question 7 of 15

The amount of incoming radiation that reaches earth's surface can vary due to _____.

Question 8 of 15

Which statement about radiant energy is true?

Question 9 of 15

Solar energy striking the Earth averages 200W/m2. If solar cells are 10 percent efficient, what size solar cell would you need to power a 100-watt light bulb?

Question 10 of 15

A typical concentrated solar power plant requires about 5 acres of land for every megawatt of generating capacity. By this standard, about how much land might a 100 MW solar plant need?

Question 11 of 15

When two photovoltaic modules are wired in parallel, _____.

Question 12 of 15

Solar cells put out what type of current?

Question 13 of 15

How does alternating current (AC) differ from direct current (DC)?

Question 14 of 15

Which type of circuit is illustrated in the diagram?

Question 15 of 15

This diagram is an example of __________.

Your Review Results

Solar energy striking the Earth averages 200W/m². If solar cells are 10 percent efficient, what size solar cell would you need to power a 100-watt light bulb?