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  1. Jaf

    Aga khan entry test 2012

    A2? :eek: You're all in AS?
  2. Jaf

    Physics: Post your doubts here!

    Oh wow. Yes, this is it! Thanks so much! :D
  3. Jaf

    Chemistry: Post your doubts here!

    To date, I have not seen a single CIE, AQA, Edexcel or OCR, reference or endorsed, book that mentions this reaction (believe me, I've done my reading!). I found it on the internet when I first bumped into the MCQ.
  4. Jaf

    True. People do not understand this disease enough. It's frustrating to hear people say 'Oh...

    True. People do not understand this disease enough. It's frustrating to hear people say 'Oh cancer? Tsk, tsk. How much more time does he have?'. Fortunately, this is not the case these days. A tremendous amounts of cancers today are curable (you'd think all those funds going for 'cancer...
    • Jaf
    • Profile post
  5. Jaf

    Chemistry: Post your doubts here!

    But we haven't studied the chemistry of it yet. So for us such a reaction, in effect, does not exist. I know, I know there's an MCQ which assumes you DO know this happens but there it's a different issue (the other options are absolutely wrong). This is just one of the things really messed...
  6. Jaf

    Maths p6 normal distribution.. :(

    Memorize this rule: Use end correction whenever you're changing from binomial distribution to normal distribution. That is, wherever you use normal approximation. (like in the question below) Probability of getting an underweight apple = 2/15 Therefore, p = 2/15, q = 13/15 (where q is the...
  7. Jaf

    Physics: Post your doubts here!

    I - uh - didn't ask for the other answers. :unsure: And are you sure you meant to say right AND down, and left AND up instead of right and left OR down and up? Because the former wouldn't make sense. You'd have directions pointing in both, the clockwise and anticlockwise directions. :/ Part...
  8. Jaf

    Physics: Post your doubts here!

    Why is the direction the way it is? I don't get it.
  9. Jaf

    Physics: Post your doubts here!

    What is the direction of force on the charges in this question and why? (6b) : http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s05_qp_2.pdf The mark scheme doesn't mention anything. The examiner report is unhelpful too. :| Also...
  10. Jaf

    Chemistry pp ( 31) grade thresholds ..

    That's what I did too. The question specifically mentioned 'the whole volume'. *high five* :p
  11. Jaf

    PHYSICS 9702 P3 help!!!

    We don't. :confused:
  12. Jaf

    PHYSICS 9702 P3 help!!!

    [(0.319-0.276)/0.319] x 100 = 13.5% Now if you're going by the method of comparing this with the individual uncertainty of 'k' you have already found in the experiment earlier, and this percentage uncertainty is more than that individual percentage uncertainty, then it IS directly proportional...
  13. Jaf

    PHYSICS 9702 P3 help!!!

    LOL ;)
  14. Jaf

    Statistics - S1 - post your doubts here!

    ^Comes with practice. The rule is if the order matters, use permutations. If it doesn't, use combinations. But most people giving the exam this May would (and should!) already know this much.
  15. Jaf

    statistics doubt

    For the third one, first find the number of ways Mrs. Brown can sit in the front row. There are only 3 (3P1) possible ways. Now you've assigned a place to her. Next, since Mrs. Lin needs to sit behind a student, she can take all places except the three seats in the first row and one seat in...
  16. Jaf

    Chemistry: Post your doubts here!

    As2O3 + 4(VO2)^(+) + 4H+ à As2O5 + 4(VO)^(2+) + 2H2O
  17. Jaf

    physics practical 9702

    Yes. Find the constant k for each of the 2 r and t values you've gotten by this formula: k = r/(t^2) If the k values are not similar (within the limits of experimental accuracy), then the idea is not supported (or conversely, IS supported). When I did this experiment at school, my values did...
  18. Jaf

    Chemistry paper 1 mess up in riyadh center

    Jo bhi hai, I did feel really stupid when I couldn't remember what group oxygen was in (I always get confused between nitrogen and oxygen). :(
  19. Jaf

    Chem 11

    ^LOL xD
  20. Jaf

    ***WARNING***

    What does this mean? Everyone and I mean EVERYONE knows in Pakistan what is coming. They know the all the titre values and all the temperatures.
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