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simple pendulum, simple pulleys, siphon, levers, balloon, pumps, hydrometer, pressure cooker, thermos flask, gramophone, telegraphs, telephone, periscope, telescope, microscope, mariner's compass; lightening conductors, safety fuses. section 'b' (chemistry): physical and chemical changes. elements, mixtures
paints, safety matches, and gun-powder. elementary ideas about the structure of atom, atomic, equivalent and molecular weights, valency. section 'c' (general science): difference between the living and non- living. basis of life – cells, protoplasm's and tissues. growth and reproduction in plants and animals...
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