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  1. Mahnoorfatima

    Physics: Post your doubts here!

    What happens when the time base on the C.R.O is doubled and the Y gain is unchanged? Should the frequency remain unchanged?
  2. Mahnoorfatima

    Physics: Post your doubts here!

    https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9702_s14_qp_13.pdf In question11 whats the diff bw a and b??? ANYONE??
  3. Mahnoorfatima

    Physics: Post your doubts here!

    https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9702_s14_qp_12.pdf 16 and 35 anyone please I dont get it from that physics website of solutions at all!!
  4. Mahnoorfatima

    Physics: Post your doubts here!

    https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9702_s14_qp_12.pdf Q35 anyone. It's a pretty simple question but idk I can't solve it. :mad:
  5. Mahnoorfatima

    Physics: Post your doubts here!

    It's a simple parallel and series circuit. Look the resistor with the junction is parallel to the three resistors with no junction between them. So, add 10+10+10 = 30 then solve for 30 and 10 as in a parallel circuit. Thus product/sum = 10x30/10+30 which is 7.5 which is B ie between 1 and 10 ohms.
  6. Mahnoorfatima

    Chemistry: Post your doubts here!

    http://www.sheir.org/a-level-chemistry-13-nov2010.pdf Question 25 why not A?? And in 12 my ans is A?
  7. Mahnoorfatima

    Chemistry: Post your doubts here!

    TYSM!
  8. Mahnoorfatima

    Chemistry: Post your doubts here!

    Why the division by a million? :/
  9. Mahnoorfatima

    Chemistry: Post your doubts here!

    25 is C rest are correct. Can you please explain? :rolleyes:
  10. Mahnoorfatima

    Chemistry: Post your doubts here!

    http://www.sheir.org/a-level-chemistry-13-nov2011.pdf Q 14 and 15 and 25 anyone?
  11. Mahnoorfatima

    Chemistry: Post your doubts here!

    http://www.sheir.org/a-level-chemistry-11-june2011.pdf In q 40, how can X be ethanoic acid? The emperical formula is C4 whereas ethanoic has 2 C only??
  12. Mahnoorfatima

    Chemistry: Post your doubts here!

    But why don't you take the moles of Al2O3 to that of HCl directly?
  13. Mahnoorfatima

    Chemistry: Post your doubts here!

    Why cant we use NaOH(aq) and K2Cr2O7/H2SO4 to convert BrCH2CH2Br to X and to HO2CCH2CH2CO2H??
  14. Mahnoorfatima

    Chemistry: Post your doubts here!

    http://www.sheir.org/a-level-chemistry-11-june2011.pdf Question 8? And in 11 why's D wrong? 13 My answer's D. What did I do wrong in this calculation: Al2O3: 6HCL 0.02x6= 2xvolume/1000 AND I DONT GET 15 AND 16 AT ALL! :(
  15. Mahnoorfatima

    Physics: Post your doubts here!

    https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9702_s12_qp_33.pdf Question 1 part e. Can someone PLEASE explain how to find units ?????
  16. Mahnoorfatima

    Physics: Post your doubts here!

    https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9702_w14_qp_22.pdf qs 2 ai? how do we know what values to take?
  17. Mahnoorfatima

    Physics: Post your doubts here!

    http://www.sheir.org/a-level-physics-23-nov2013.pdf Q4 bii ANYONE PLEASE!
  18. Mahnoorfatima

    A level Biology: Post your doubts here!

    If the vol of the smallest division on a syringe is 0.5(right?) then the degree of uncertainty should be 0.5/2?
  19. Mahnoorfatima

    A level Biology: Post your doubts here!

    Thank you!(y)
  20. Mahnoorfatima

    A level Biology: Post your doubts here!

    https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9700_w12_qp_33.pdf qs 2 bi ANYONE!? PLEASE!
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