Explain why, fire caused by electricity should not be extinguished by pouring water.
Ordinary water conducts electricity to some extent. So, when water is thrown over the burning electrical appliance or burning electric wires, it can give electric shock to the person involved in fire-fighting. Thus, water should not be used to extinguish fires caused by electricity.
What are different types of combustion?
Describe how green house effect may cause atmospheric heating ? Name any two atmospheric constituents responsible for it.
Explain various harmful effects of burning fuels.
Draw a diagram to explain that air is essential for combustion.
