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Give short answers to the following question:
1. Cracker on ignition produces sound. Why?
When a cracker is ignited, a sudden reaction (very rapid) takes place with the evolution of heat, light and sound and a large amount of gas is liberated. Such a reaction is called an . The gases produced are heated by the heat evolved in the reaction.
The hot expand rapidly and cause an explosion (producing a loud sound).
The hot expand rapidly and cause an explosion (producing a loud sound).
2. What do you understand by fuel efficiency?
Fuel efficiency is determined by its , the heat energy produced on the combustion of 1 kg of fuel. The calorific value of a fuel is expressed in kJ/kg.
A good fuel should have a high calorific value. That means it should produce a large amount of per unit mass.
A good fuel should have a high calorific value. That means it should produce a large amount of per unit mass.
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