Comparative and Superlative Adjectives Quiz

Which type of energy is generally considered cleaner: renewable or non-renewable?

• both are the same

• renewable

• neither is clean

• non-renewable

Which energy source is the most sustainable over time?

• natural gas

• coal

• nuclear energy

• solar energy

Which energy source is often described as the least harmful to the environment?

• wind energy

• natural gas

• oil

• coal

Which type of energy is usually more expensive to use in the long run?

• non-renewable energy

• both are the same

• renewable energy

• solar energy

What is considered the cleanest energy source?

• geothermal energy

• coal

• natural gas

• oil

Which energy source is typically more reliable and constant?

• hydropower

• geothermal energy

• solar energy

• wind energy

What is the most abundant renewable energy source on Earth?

• coal

• wind energy

• natural gas

• solar energy

Which type of energy usually creates more pollution?

• solar energy

• renewable energy

• wind energy

• non-renewable energy

Which renewable energy source is considered the most efficient in converting natural resources into electricity?

• solar energy

• wind energy

• hydropower

• biomass

Which of the following is the most processed non-renewable energy source?

• oil

• natural gas

• coal

• uranium