Among different kinds of water which of the following is free from bacteria ?

Options

A. Deep well water
B. Sea water
C. Water of hot springs
D. Rain water as it falls down

Explanation

To determine which type of water is free from bacteria among the given options, we will analyze each type of water one by one.

### Step-by-Step Solution:

1. **Deep Well Water**:
- Deep well water is collected over time and can accumulate bacteria. Common bacteria found in deep well water include coliform bacteria and E. coli, which can cause diseases. Therefore, deep well water is **not free from bacteria**.

2. **Seawater**:
- Seawater is heavily contaminated due to human activities. It often contains a large number of bacteria from sources like human waste and other pollutants. Hence, seawater is also **not free from bacteria**.

3. **Water of Hot Springs**:
- Hot springs have high temperatures, which can support the growth of certain bacteria known as thermophilic bacteria. An example of such bacteria is Sulfolobus. Therefore, water from hot springs is **not free from bacteria**.

4. **Rainwater**:
- Rainwater, as it falls, is initially free from bacteria because it does not remain stagnant or collected for long periods. It is collected from the atmosphere and does not have the same contamination sources as the other types of water. Thus, rainwater is **free from bacteria** when it falls.

### Conclusion:
The correct answer is **rainwater as it falls down**, as it is the only type of water among the options that is free from bacteria.

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