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  1. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    heterozygous is (C) this is becoz see that upon reproducing black and white, black appears only in first pair, showing black is dominant. in second pair, we know that white is homozygous recessive, and when heterozygous reproduces with homozygous recessive, the ratio of 1:1 is observed ( in this...
  2. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    o_O.......really, is that even possible? :P
  3. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    yes, i meant that the difference in conc. and the diff in particle size would combine to nullify each other's effect, causing the rate of reaction to be same! the only thing i am confused is that why have they specifically mentioned "zinc pieces" and "zinc powder" if they dont intend us to use...
  4. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    but yar wouldnt particle size also effect rate of reaction???:confused:
  5. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    this has been cleared man: carbon brushes are used both in AC generator and DC motor to keep contact with circuit without restricting movement! in AC generator, SLIP rings are used in DC motor, SPLIT ring commutator is used
  6. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    that i know, but why P is faster when surface area of zinc is less?
  7. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    can anyone explain this http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20O%20Level/Chemistry%20(5070)/5070_s11_qp_42.pdf why is Q6 answer not a? because in P, the concentration is high, but surface area is low(zinc pieces) an in Q, the concentration is low, and surface area is...
  8. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    carbon brushes are used both in AC generator and DC motor to keep contact with circuit without restricting movement! in AC generator, SLIP rings are used in DC motor, SPLIT ring commutator is used
  9. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    for maybe, "maybe" u will get the mark :P!! just kidding, i am sure that the examiner will reward u a mark for recognizing the factor of small amount. i rounded them up, but wrote both of them, the non-rounded and the rounded figures, though the marking schemes have not been released so anyone...
  10. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    so it keeps contact with the circuit, without restricting it to a certain position.
  11. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    yaar main bata raha tha! :mad: :)
  12. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    metal oxides are usually white except for CuO is black. PbO is yellow. metals are usually silver, shiny. transition metals colourful(keep in mind the colour of precipitates of the anion test)
  13. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    the colour changes from "orange to green" and "purple to colourless" when "potassium dichromate" and "potassium mangnate" are added to a reducing agent respectively!(they are oxidising agents) and the colour changes from colourless to brown when potassium iodide is added to any oxidising...
  14. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    but actually, the labelling line of "Y" did not extend to the inner small circle. anyway, it was of two marks only!;)
  15. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    no yaar, i think that the whole of the oval egg was to be drawn, as the picture mentioned that some granules were shown in the storage organ, and we had to draw one of the granule labelled Y. I dont think there was any mention of CELLS, though i could be wrong. its (c) C3H6 the reason being...
  16. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    yes
  17. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    there were three marks for identifying the correct eg: protein, reducing sugar, starch, and probably only one mark for small amount mentioned!
  18. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    ok people start thanking me! :D :P
  19. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    Aha! maza aa gaya!
  20. ashiqbal

    Biology; Chemistry; Physics: Post your doubts here!

    yes the correct order is incisors, canines, premolars, molars
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