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Alevel physics practical-help regarding solving paper

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hello
i have performed very few practical of physics at college.and our teacher did not guide us properly , how to solve paper aaccording to the expectations of examiners.Please tell me all about for which physical quantities i must us how many decimal places.Like in chemistry we write no. of moles upto 3 significant figure.likewise tell me upto how many s.f the physical quantities must be quoted.
i have practical of component 34 and it will commence on 31st may 2012..please help me out
 
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