6 WEEKS TEST 2019

What is one advantage of using Hydroelectricity?

• Reservoirs can be used for irrigation of crops

• May divert water and alter normal water flow

• might disrupt the movement of migrating salmon

• Sometimes causes flooding in surrounding areas.

One disadvantage of using coal to produce electricity is that coal-

• forms in a short amount of time.

• is abundant over a wide area.

• is not environmentally friendly.

• is relatively quite affordable.

Although hydroelectricity is the least expensive energy source to generate electricity, most utility companies do not use it because

• hydro-plants tend to last longer than plants powered by fossil fuels.

• hydroelectricity causes more pollution, due to the emission of greenhouse gases.

• hydro-plants are expensive to construct and need expensive machinery.

• reservoirs associated with dams can be used for irrigation as well as recreation.

An advantage of burning coal to generate power for electricity is that coal is-

• Relatively inexpensive to mine and transport

• available in limited supply

• found in few places in the United States

• harmful for the environment

Why is it better to obtain energy from natural gas instead of oil? Natural gas-

• produces fewer greenhouse gases

• is a renewable energy source

• is not a natural resource

What do geothermal and solar have in common?

• Sunlight is needed for both to generate energy.

• Both of these energy resources are non-renewable.

• Neither resource produces greenhouses gases.

What is the major disadvantage of using nuclear power to generate electricity?

• A small amount of power is produced.

• No greenhouse gases are produced

• The power plants are inexpensive to build.

• the by-product is radiation.

If a community is choosing between solar and wind energy, which advantage would make wind a better option?

• A backup system is necessary when there are cloudy days, or no wind to power the turbines.

• Wind is less expensive, and it is limitless.

• Locations for turbines are limited because obstructions block the wind

• The electricity generated by wind often varies due to fluctuations in wind speed

The advantage of burning coal in order to generate electricity is that coal is-

• an inexpensive source of energy.

• the least energy-efficient fossil fuel.

• a non-polluting source of energy.

• a renewable source of energy.

What would be a potential problem when collecting wind energy?

• Wind is nonrenewable.

• Wind is unpredictable.

• Wind makes pollutants.

• Wind turbines are cheap to make.