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  1. Usman04

    Statistics S1 post your doubts here

    Plz tell in detail about independent events. How can we check whether the events are independent?? In the give paper q1 is about independent event plz solve it!! http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s13_qp_63.pdf
  2. Usman04

    How was Chemistry/12 ?

    how can this increase the gt i have discussed paper with many people in my center
  3. Usman04

    How was Physics/12 paper?

    hi guy i want to discuss some questions the question of thermistor and ldr what is the correct answer for that question the question of f air resistance in which graph was made the question of air which collide with wall and what happens if all the external forces are cancel out and the...
  4. Usman04

    Physics: Post your doubts here!

    simple in question he says the collision is inelastic so kinetic energy is not conserved. Speed also changes because in inelastic collision speed decreases. so change in momentum = m1v1 - {-m2v2} 2mv-{-2m * v/2} 2mv-{-mv} when u solve it u get 3mv c is the coorect option
  5. Usman04

    Physics: Post your doubts here!

    thanks for clearing my problem but what will we do if he asks drk fringes or minima???
  6. Usman04

    Physics: Post your doubts here!

    hi guys i have many problems to discuss i am writing all the problems below firsly i have seen many mcqs about how many maximas minimas or bright fringes or observed in differaction grating and number of line per mm is D or N. i remeber one mcq in past paper plzz solve it oct/nov 2012 paper 12...
  7. Usman04

    AS Physics P1 MCQs Preparation Thread.

    hi guys i have done many past papers. so many times i have seen question about bright fringes,dark fringes maximas or minimas Can anyone explain me fully that how to find maximas minimas or greatest no of maximas in diffraction grating and one thing more no of lines per mm is D or 1/N ??? in...
  8. Usman04

    Chemistry: Post your doubts here!

    hi guys im facing some problems in mcqs somebody plzz help q 13, q 20, may june 09 p01 http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s09_qp_1.pdf
  9. Usman04

    PAPER 1 MAY/JUNE 2013 PHYSICS DOUBTS HERE

    some body plz answer que no 13,18,28,34 from oct/nov 2010 paper 11 http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w10_qp_11.pdf
  10. Usman04

    how was physics practical 34?

    hay guys iwannt to confirm one thing that igot wrong daimeter so in other questions examiner deduct my marks or he will allow error carry farward
  11. Usman04

    how was physics practical 34?

    mine was exellent. expecting above 36 in this practical
  12. Usman04

    Biology paper 34

    thanks dude
  13. Usman04

    Biology paper 34

    Mine was fine except Q1 one thing i want to discuss is thatin graph q the water pottential on y axis starts from -3 some were saying that we have start our graph from -3 because it is smallest value. is there anyone who had made the graph correctly
  14. Usman04

    How was Chemistry P34?

    CAN ANYONE TELL ME WHICH ANION IS PRESENT IN FB9 SULPHAATE OR SULPHITE
  15. Usman04

    Chemistry: Post your doubts here!

    Ammonium sulfate in nitrogenous fertilisers in the soil can be slowly oxidised by air producing sulfuric acid, nitric acid and water. How many moles of oxygen gas are needed to oxidise completely one mole of ammonium sulfate? A 1 B 2 C 3 D 4 plz explain this
  16. Usman04

    Chemistry: Post your doubts here!

    is there anyone who have paper 1 Mcqs explaination year wise
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