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  1. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    ur logic is correct asma. we are calculating R of resistor not lamp. so we need to subtract to get p.d or resistor. thanx.
  2. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    i can not believe how silly i m. i have no right to live in this planet any more :cry: they gave p.d of lamp but i calculator R of resistor by p.d of lamp. much a silly mistake. my teacher would not even tell me answer but have murdered me.
  3. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    by v=ir i get 68ohms answer is 292. er says that most students forgot to subtract. subtract what?
  4. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    hmm.. but u never know. i read in examiner report that most of the candidates were confused by which factors affected strength of electromagnet. next year they gave more than 3 questions relating to the same thing. they said in 2008 that most candidates were unfimiliar with rotating magnet...
  5. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    and most last question?
  6. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    oops i did not see that. i printed these two pages from s11/qp21 so thought why not ask u guys before taking to school
  7. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    tell me last question of last page
  8. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    i remember i wrote his name at end :unsure:
  9. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    i said Q8bi which means "question number 8 ke b part ka second part" :rolleyes:
  10. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    i still dont get it. total moment is sum of moment. there are two forces(although they have same magnitude and direction but they are different) so why u take only one? i must ask my teacher. Saad Mughal please explain, u r gud at explaining.
  11. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    janab ek qoutation arz he: everybody's a genius but u if keep on judge fish by it's to climb tree, u will not see how gud it is at swimming(quotation after post mortem)
  12. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    a quick question: Q8bi part and last question of the paper. can u please explain me. asma tareen
  13. Suchal Riaz

    Maths, Addmaths and Statistics: Post your doubts here!

    tdk i strongly doubt that u can get soft copies of such old papers. u can either get it from u school library or buy past papers book. somebody told me muhammadali233 has some old papers
  14. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    no most people memorise: E=ml, e=mc thta but mostly i do MOST of my calculation by looking at left and right hand side of my equation by units. i make equation in mind. i learned it from first year physics course from MIT it's a kind of quick dimensional analysis to check ur method.
  15. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    so u also do these calculations by looking at units :p i though that it was just me does not memorise "mltheta weeta blah blah" but look at units to get answer:D
  16. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    no kinetic. speed is constant
  17. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    as she pedals up, the speed is constant so main changes are from chemical to gravitaional potential energy with some of it wasted in internal energy/ or heat energy. no kinetic because the speed is constant.
  18. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    ohh u mean 'now it makes SOME sense, let it be' okay okay i wont stop u. :p but still the acid wont be removed from burrette either, just the way whole water wont be. no matter how much time u rinse it, u will add more dilute acid, when u spill it out some of it will stick to sides. maybe it...
  19. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    man doesn't acid contain water? my parents are wondering why i m laughing alone in my room :D first error intact, another added. water still in container but further H+. even bigger error. better wash from water than let it dry. u can wach from petrol or other volatile liquid which will...
  20. Suchal Riaz

    Biology; Chemistry; Physics: Post your doubts here!

    would not it add more H+ ions affecting concentration :ROFLMAO: and there are dozens of questions for which this is said to be an error due to which the result of an experiment was wrong. i can show u many questions.
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