(a) What is a fuel? Give five examples of fuels.
(b) What are the characteristics of an ideal fuel (or good fuel)?
(c) The calorific value and ignition temperature of fuel A are 55 kJ/g and 80°C, respectively. These values for fuel B are 80 kJ/g and 10°C, respectively. On burning, the fuel A produces CO₂ and H₂O while the fuel B produces CO₂, CO, and SO₂. Give three points of relative advantages and disadvantages of these two fuels.

Academic Physics NCERT Class 10

(a) Fuel is defined as the materials that are burnt to produce heat energy.

Examples of fuels are Wood, Coal, Petrol, Kerosene and Liquefied Petroleum Gas (LPG).

(b) The characteristics of a good fuel are the following.

1. It should have a high calorific value, means it should give a sufficient amount of heat per unit mass.

2. It should have a proper ignition temperature so that it burns easily, this means that it should neither be too low nor too high.

3. It should burn without giving out any harmful gases so that it does not pollute the air.

4. It should be inexpensive, easily available and easy to handle.

(c) Advantages of fuel 'A':

1. It has a moderate ignition temperature, which is 80°C.

2. It does not produce any harmful gases.

Disadvantages of fuel 'A':

1. It has a low calorific value of 55 kJ/g and hence generates less heat per unit mass.

Advantage of fuel 'B':

1. It has a high calorific value of 80 kJ/g and hence generates more heat.

Disadvantages of fuel 'B':

1. It has a very low ignition temperature of 10°C and hence unsafe to use.

2. It produces harmful gases like CO and SO₂.

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Updated on: 10-Oct-2022

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