Lakhmir Singh & Manjit Kaur - Physics

Book: Lakhmir Singh & Manjit Kaur - Physics

Chapter: 3. Sources of Energy

Subject: Physics - Class 10th

Q. No. 30 of Questions Based on High Order Thinking Skills (HOTS)-Pg-123

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The calorific values of three fuels A, B and C are 33 KJ/g, 150 KJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. On combustion, both A and B produces carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.

Fuel B is the most ideal fuel due to the following main reasons:

(i) As it leaves no reside on burning like the other two.

(ii) As an idle fuel it has a high calorific value of 48 KJ/g.

(iii) Moreover it does not burn explosively.

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