Worksheet Sources of Energy - Name: Surname: Sources of Energy ... - Free Printable

Let's solve each question step by step and provide explanations.

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Q.1. Fill in the blanks with suitable words.

a) _________ is the ability to do work.
✔ Energy
👉 *Explanation:* Energy is defined as the capacity or ability to do work. It can exist in various forms such as kinetic, potential, thermal, etc.

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b) _________ is the ultimate source of energy.
✔ Sun
👉 *Explanation:* The Sun is the primary source of energy for Earth. It drives photosynthesis, weather systems, and indirectly powers most renewable sources like solar, wind, and biomass.

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c) ___________ energy sources can be replenished continually.
✔ Renewable
👉 *Explanation:* Renewable energy sources (like solar, wind, hydro) are naturally replenished on a human timescale and are sustainable over time.

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d) ____________ energy sources are in limited supply, in danger of depletion, and take a very long time to make.
✔ Nonrenewable
👉 *Explanation:* Nonrenewable resources like coal, oil, and natural gas were formed over millions of years and cannot be replaced quickly once used up.

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e) Combustion of fossil fuels releases large quantities of __________ into atmosphere.
✔ Greenhouse gases (or specifically carbon dioxide)
👉 *Explanation:* Burning fossil fuels releases CO₂, methane, and other greenhouse gases that contribute to global warming and climate change.

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Q.2. Label the following energy sources as "Renewable" and "Nonrenewable".

| Energy Source | Classification |
|-------------------|----------------------|
| Coal | ✘ Nonrenewable |
| Biomass | ✔ Renewable |
| Hydropower | ✔ Renewable |
| Natural gas | ✘ Nonrenewable |
| Geothermal | ✔ Renewable |
| Oil | ✘ Nonrenewable |
| Solar | ✔ Renewable |
| Nuclear | ✘ Nonrenewable (Note: Uranium is finite) |
| Wind | ✔ Renewable |

> 🔍 Explanation:
- Renewable: Sources that are naturally replenished — Biomass, Hydropower, Geothermal, Solar, Wind.
- Nonrenewable: Finite resources — Coal, Natural Gas, Oil, Nuclear (since uranium is not renewable).
> ⚠️ Note: While nuclear power uses radioactive materials (like uranium), these are considered nonrenewable because they take millions of years to form and are not replenished on a human scale.

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Q.3. Which of the following energy sources produced from moving water?

a) Geothermal
b) Hydropower ✔
c) Biomass
d) Natural gas

✔ Answer: b) Hydropower
👉 *Explanation:* Hydropower generates electricity using the movement of water (in rivers or dams). The kinetic energy of flowing water turns turbines.

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Q.4. Which of the following energy sources produced by the heat stored within Earth?

a) Geothermal ✔
b) Hydropower
c) Biomass
d) Natural gas

✔ Answer: a) Geothermal
👉 *Explanation:* Geothermal energy comes from the heat stored beneath the Earth’s surface, which can be used directly or to generate electricity.

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✔ Final Answers Summary:

#### Q.1
a) Energy
b) Sun
c) Renewable
d) Nonrenewable
e) Greenhouse gases (or carbon dioxide)

#### Q.2
- Coal → Nonrenewable
- Biomass → Renewable
- Hydropower → Renewable
- Natural gas → Nonrenewable
- Geothermal → Renewable
- Oil → Nonrenewable
- Solar → Renewable
- Nuclear → Nonrenewable
- Wind → Renewable

#### Q.3 → b) Hydropower

#### Q.4 → a) Geothermal

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