28. (i) State the principle used in fire fighting.
(ii) Name two places where even a burning matchstick can lead to disastrous
I
fire.
(ii) Differentiate between combustion of white phosphorus and a fire cracker.
(iv) Suggest one method that can be used to extinguish fire caused by :
(a) Electric short circuit
(b) Oil
Answers
Ques. State the principle used in fire fighting.
Ans. there are three conditions essential for fire: fuel, oxygen, and heat (or ignition source). These three conditions are often represented as the fire triangle. If one of these conditions is missing, fire does not occur; and if one of them is removed, fire is extinguished
Ques. Name two places where even a burning matchstick can lead to disastrous in fire.
Ans. petrol pump and kitchen
Ques. Differentiate between combustion of white phosphorus and a fire cracker.
Ans. Explosion can takes place when pressure is applied on the cracker. Phosphorus burns in air at room temperature. It represents spontaneous combustion. Burning of matchstick and burning of cooking gas represents rapid combustion.
Ques. Suggest one method that can be used to extinguish fire caused by
(a) Electric short circuit
ans. If you don't have a fire extinguisher, you can use baking soda to extinguish an electrical fire
(b) Oil
ans in case of fire by oil use fire extinguisher this is best way