Which of the following is a source of energy but does not cause pollution ?

Options

A. Gasoline
B. Nuclear Power Plants
C. Fossil Fuels
D. Sun

Answer

To determine which of the following options is a source of energy that does not cause pollution, we can analyze each option provided:

1. **Gasoline**:
- Gasoline is a common fuel used in vehicles. When burned, it releases pollutants such as carbon monoxide, nitrogen oxides, and unburned hydrocarbons. These contribute to air pollution and have harmful effects on the environment and human health.

2. **Nuclear Power**:
- Nuclear power plants use uranium as fuel. While they do not emit carbon dioxide during operation, the mining and processing of uranium can have environmental impacts. Additionally, nuclear power can lead to radioactive waste, which poses long-term pollution risks.

3. **Fossil Fuels**:
- Fossil fuels, such as coal, oil, and natural gas, when burned, release significant amounts of pollutants including carbon dioxide, nitrogen oxides, and sulfur dioxide. These contribute to air pollution, acid rain, and global warming.

4. **Solar Energy**:
- Solar energy is harnessed from sunlight using solar panels. It is a renewable energy source that does not produce air pollutants during its operation. The manufacturing of solar panels may have some environmental impact, but the energy produced during their use does not contribute to pollution.

Based on the analysis above, the answer to the question is **Solar Energy** (often represented as option D). It is a source of energy that does not cause pollution.

### Step-by-Step Solution:
1. Identify the energy sources listed: Gasoline, Nuclear Power, Fossil Fuels, and Solar Energy.
2. Analyze each source for pollution potential:
- Gasoline: Causes air pollution.
- Nuclear Power: Has environmental impacts but does not emit carbon dioxide during operation.
- Fossil Fuels: Causes significant air pollution.
- Solar Energy: Does not cause pollution during energy production.
3. Conclude that Solar Energy is the only option that does not cause pollution.