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  1. Hskk

    GUESS PAPERS

    URDU FIRST LANGUAGE GUESS PAPER?
  2. Hskk

    Guess Paper/ Exams Tips (SCIENCES, ENGLISH AND MATHS ONLY!!)

    Where exactly is Urdu's guess paper? I know its irrelevant in this thread but Im kinda helpless here. :confused:
  3. Hskk

    Guess Paper(m/j-13) for PkStudies,Islamiat, Bio,Chem,Phy and Economics. Post Here

    Urdu A guess paper?
  4. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Oh okay, I'm still a wee bit unsure, but probably there's no other way. Btw, the arrows will be in the opposite direction to what you've drawn.
  5. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    You'll get the marks if you don't draw a diagram and explain well, otherwise, maybe just draw on the lines. o_O
  6. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    k Draw a-i) plz
  7. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    When drawing a circuit, is the switch drawn following the negative terminal of the cell or positive?
  8. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Note the volume of the yeast used to make the slide and count the number of cells in that particular volume which are visible in the microscope. Multiply that by the total volume of yeast in the exp.
  9. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Surface area increases when volume decreases. See, if you have one big potato and want to colour it by placing it in solution of dye, it will take alot of time for the potato to completely soak the dye, and probably, it'll still be uncoloured from the centre. But if you cut the same potato into...
  10. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    a) Taking the average always provides a more accurate result as it decreases the reaction time error. b i) The m.s. says 'distance (travelled by wave) / length of tray varies' Basically, since the ends are sloping outwards, the tray is not a proper rectangle so the distance of one wave can...
  11. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    When we cut the stem longitudinally, one side i.e. the outer one has a layer of cuticle over it which is impermeable, the other side has no cuticle so it is affected by water loss or gain. After immediately cutting the stem, the cells in the inner layer become turgid, but the cells in the outer...
  12. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Browse the site I posted previously and do past papers from 07-12, you'll be good to go. Best of luck (y)
  13. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Jeez, papers are days away and you got me doubting my prep :p Here, this'll help. https://sites.google.com/site/urbangeekclassroomsg/chemistry-classroom/qualitative-analysis
  14. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Then probably your teacher needs to revise her/his ions :p
  15. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Yes. Cu ions form a ppt in excess of sodium hydroxide and dissolve in excess aq. ammonia, since they're replacing sodium hydroxide with ammonia, the ppt will dissolve to give a deep blue solution.
  16. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Blue ppt dissolves, and a deep blue solution is formed.
  17. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    When its not specified in the m.s my teacher gives half the marks for labelling and half for drawing. To be on safe side, I suggest you always write all the labels visible disregarding the marks. In this diagram you can label the testa/seed coat, endosperm/cotyledon, and plumule(unshaded part on...
  18. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Mr of ammonium phosphate: 149 Mr of N in ammonium phosphate: 3*18= 42 Mass of N= (42/149)*1000= 281.88 g
  19. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Mg was in excess because there are more number of moles of Mg than H2SO4.
  20. Hskk

    Biology; Chemistry; Physics: Post your doubts here!

    Q1.c ii) Add a little NaOH and aluminium powder, heat the mixture, test the gas that evolves with damp red litmus paper. Litmus paper will turn blue because ammonia gas was formed. Q6. You see, according to the equation of the reaction, the acid and gas evolved are both in a 1 to 1 ratio so c...
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