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
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.
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 |
State whether the following statement is True/False.
Magnesium is a non-combustible metal.
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 ______.
