Arrange the following fuels in increasing order of their calorific value
1. Petrol
2. Diesel
3. Kerosene
4. Natural gas

Options

A. 1, 2, 3, 4
B. 2, 3, 4, 1
C. 2, 1, 3, 4
D. 3,2, 1, 4

Answer

To arrange the given fuels in increasing order of their calorific value, we first need to know the calorific values of each fuel. Here are the calorific values for the fuels mentioned:

1. **Natural Gas**: 45,000 kCal/kg
2. **Petrol**: 11,950 kCal/kg
3. **Diesel**: 10,000 kCal/kg
4. **Kerosene**: 10,500 kCal/kg

Now, let's arrange these fuels in increasing order based on their calorific values:

1. **Diesel**: 10,000 kCal/kg
2. **Kerosene**: 10,500 kCal/kg
3. **Petrol**: 11,950 kCal/kg
4. **Natural Gas**: 45,000 kCal/kg

Thus, the increasing order of calorific value is:

**Diesel < Kerosene < Petrol < Natural Gas**

### Step-by-Step Solution:

1. **Identify the calorific values**: Gather the calorific values for each fuel.
- Diesel: 10,000 kCal/kg
- Kerosene: 10,500 kCal/kg
- Petrol: 11,950 kCal/kg
- Natural Gas: 45,000 kCal/kg

2. **Compare the calorific values**: Compare the values to determine which is the lowest and which is the highest.
- The lowest value is for Diesel (10,000 kCal/kg).
- The next is Kerosene (10,500 kCal/kg).
- Then comes Petrol (11,950 kCal/kg).
- The highest is Natural Gas (45,000 kCal/kg).

3. **Arrange in increasing order**: Based on the comparison, arrange the fuels in order from lowest to highest calorific value.
- The order is: Diesel < Kerosene < Petrol < Natural Gas.

4. **State the final arrangement**: Conclude with the final arrangement of the fuels in increasing order of their calorific value.