Advertisements
Advertisements
प्रश्न
Cracker on ignition produces sound. Why?
Advertisements
उत्तर
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 explosion. The gases produced are heated by the heat evolved in the reaction.
The hot gases expand rapidly and cause an explosion (producing a loud sound).
APPEARS IN
संबंधित प्रश्न
In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.
How many types of combustion are there?
Which one of the following has the highest calorific value?
Which of the following is not a combustible substance?
Write True/False against the following statement and also correct the false statement.
Alcohol, CNG and LPG are inflammable substances.
The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg respectively. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?
Forest fire produces a lot of air pollution. Write in brief about the reasons of forest fires.
All combustion reactions are ______.
What is slow combustion? Give example.
Write the characteristics of good fuel.
