Chapter 7 Online quizzes

The largest contribution to increased CO₂ levels in the atmosphere is caused by emissions from which of the following?

Energy use

Livestock rearing

Arable cultivation

Forest clearance

Which of the following statements portrays the difference between energy and power?

The unit of energy is Joules and the unit for power is Watts per minute

Power is the capacity to do work. Power is energy integrated over time and energy is the rate at which work is done, or power is transmitted.

Energy is the capacity to do work. Energy is power multiplied by time and power is the rate at which work is done

The unit of energy is Joules per minute, and the unit for power is Joules.

How does the combustion of fossil fuels provide heat?

By breaking of carbon-hydrogen molecular bonds

Through the nuclear decay of hydrocarbons

By releasing particulate matter

By the breaking of atmospheric oxygen bonds

Which of these is not a major obstacle in transitioning from fossil fuels to renewable energies?

Variability of renewable energy supplies

Concentration of renewable energy when compared to fossil fuels

Institutional and system inertia

Plummeting prices of renewable energy installations

Which of these combinations added together dominate energy use by the consumer in high-income nations?

Gadgets, lights, and heating

Heating and cooling, and car/daily transport

Lights, defence and car/daily transport

Jet flights and Lights

What is the difference between an energy stock and an energy flow?

An energy flow you have to use right away if you don't have storage, whereas an energy stock is a store of energy you can use at any point.

An energy flow describes a consistent flow of energy through nature, like sunlight hitting the earth An energy stock is a store of energy, often a fuel.

Energy flows are often renewable energies whereas energy stores are often fossil and nuclear fuels.

All of the above given options are correct

Which of the following correctly captures a concern about using first generation biofuels worldwide?

They are responsible for driving some deforestation

They compete with food

They are not very effective at reducing carbon emissions

All of the above given options are correct

What are negative emissions?

Technologies which still emit, but have lower emissions than other alternatives

Emissions from areas below sea level

Emissions from regions with a temperature below zero

Captured and stored GHGs from the atmosphere

People in the state of California purchased around 55 million tonnes of gasoline in 2016, with a biofuel power density of 0.5 W/m². How much land would be needed to substitute this gasoline with biofuels? (Note 1 tonne of gasoline contains 42 x 10⁹ or 42,000,000,000 Joules.)

Between 140 000 and 150 000 km²

Between 120 000 and 130 000 km²

Between 80 000 and 90 000 km²

Between 50 000 and 60 000 km²

What does the carbon payback time mean?

It is the amount of time needed to make back your money in a renewable energy development

It is the time needed for a Bioenergy Carbon Capture and Sequestration plant to payback the amount of emissions used in its construction

It is the amount of money you will make from carbon trading in the future.

It is the amount of time it takes for a crop to 'earn-back' the carbon released in the initial land use change (if there was one).

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