Forest fire produces a lot of air pollution. Write in brief about the reasons of forest fires. Open Answer »
The calorific values of petrol and CNG are 45000 kJ/kg and 50000 kJ/kg, respectively. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why? Open Answer »
Give two examples each for a solid, liquid and gaseous fuel along with some important uses. Open Answer »
What are the three essential requirements to produce fire? How fire extinguisher is useful for controlling the fire? Open Answer »
Manu was heating oil to fry potato chips. The cooking oil all of a sudden caught fire; he poured water to extinguish the fire. Do you think this action was suitable? If yes, why? If not, why not? In such a condition what should Manu have done? Open Answer »
You are provided with three watch glasses containing milk, petrol and mustard oil, respectively. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why? Open Answer »
Although wood has a very high calorific value, we still discourage its use as a fuel. Explain. Open Answer »
People usually keep Angethi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open? Open Answer »
