Standard Grade Science
Alternative sources of energy
Click on the box which shows the correct answer.
The half-life of a radioactive material is
- Half the time it took the material to form in the Earth's crust
- The time it takes for the material to lose half of its radioactivity.
- The time it takes for the radioactive material to give out half its radioactivity
- The time it takes for the material before it must be removed from the power plant and safely stored
The longer the half-life of a radioactive material
- the more of it is needed to produce energy in a nuclear power station
- the more expensive it is to buy.
- the less time it takes for the material to be stored before it becomes safe.
- the more time it takes for the material to be stored before it becomes safe.
Alcohol for use as a fuel can be obtained from
- cow dung
- tree bark
- sugar
- compost
The process which converts sugar into alcohol is known as
- Fermentation
- Condensation
- Fractional distillation
- Evaporation
Extracting energy by pumping cold water down into hot rocks and using the steam produced to make electricity is called
- Seismic energy
- Hydro-electric energy
- Geological energy
- Geothermal energy