Advertisements
Advertisements
प्रश्न
Cracker on ignition produces sound. Why?
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 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
Can the process of rusting be called combustion? Discuss.
In the presence of water, the ignition temperature of paper is ______.
How many types of combustion are there?
Which of the following is not a combustible substance?
Boojho wants to separate the following materials as combustible and non-combustible. Can you help him?
| Charcoal | chalk | stone | iron rod | copper coin | straw | cardboard | glass | paper | candle | wood |
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.
