Long answer type questions
Q No. 1 Materials which allows electric current to pass through them are good conductors of Electricity, What are the materials known as which do not allow electricity to pass through them easily?
Also name the materials which do not allow the electricity current to pass through them.
Illustrate your answer with suitable examples.
OR
We are being cautioned not to touch or handle an electric appliance with wet hands or while standing on the floor . Why is it so? Why water is not used for extinguishing fire caused due to short circuits.
Q No 2 You might have noticed the shape of the iron nail and aluminium wire changed on beating, if beated harder they can be changed to sheets. What is this property of metals know as ? Write down the example of metals which can be drawn into the wires? Also name this property of the metals? Define Sonorous property of metals?
OR
In case of the fire, before the fireman use the water hoses, they shut off the main electric supply for the area. Why thy do so?
Q No 3 A serious threat has become a major concern to the world. To combat to many countries have reached an agreement to reduce the emission of green house gases. What is the serious threat known as? And what is the agreement called as ?Explain the consequences of such a global threat?
OR
An undesirable change in the physical or chemical or biological characteristics of air is called "Air pollution." What are the substances known as which contaminate air? Name the agents which lead to air pollution and explain any one of them.
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