Physics
Grade-10
Easy
Question
Which of the following is true about the plant remains as a source of energy?
- Clean, safe & expensive
- Available, cheap
- Infinite, clean & hot
- All are correct
Hint:
Plant remains, including tiny seeds and pieces of wood charcoal etc.
The correct answer is: Available, cheap
- Plant remains, including tiny seeds and pieces of wood charcoal, are separated from the soil through the process of flotation. Flotation involves putting a small amount of soil into a container of water. The heavier soil and rocks sink to the bottom. Lighter plant remains float.
- Plant remains are available and are cheap.
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