Which of these is an example of a non-combustible substance?

Options

A. Kerosene
B. Petrol
C. Water
D. LPG

Answer

To determine which of the given options is a non-combustible substance, we need to understand the definitions of combustible and non-combustible substances.

### Step-by-Step Solution:

1. **Define Combustible Substances**:
- Combustible substances are those that can burn in the air and produce heat and light when they do so. Examples include materials like wood, kerosene, petrol, and LPG.

2. **Define Non-Combustible Substances**:
- Non-combustible substances are those that do not burn in the presence of air. They do not produce heat or light when exposed to fire. An example of a non-combustible substance is water.

3. **Analyze the Options**:
- **Option 1: Kerosene** - This is a combustible substance as it burns in the air.
- **Option 2: Petrol** - This is also a combustible substance as it burns in the air.
- **Option 3: Water** - This is a non-combustible substance as it does not burn in the presence of air.
- **Option 4: LPG (Liquefied Petroleum Gas)** - This is a combustible substance as it burns in the air.

4. **Conclusion**:
- Among the options provided, water is the only substance that does not burn in the presence of air, making it the correct answer. Therefore, the answer to the question is **water**.

### Final Answer:
**Water is an example of a non-combustible substance.**

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