guess me the working topics for exhibition
mecool30:
wht is the meaning of ur question?
i thnk piyusha1234 wants topics on working models for exhibition.
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u can make models on rainwater harvesting , volcano , thermal power plant..!!
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You could make an fire alarm you would need a board a resistent a transistor a capiciter a buzzer and a sensor firstly attach the resistent transitor and capiciter to the board and then attach there sensor buzzer and battery
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