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  1. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    Koi BAAP ka DADA hai to explain this MCQ.. Energy, Work and Power MCQ 50 :confused::notworthy: http://books.google.com.pk/books?id=W1nHB3WcyOEC&pg=PA48&source=gbs_selected_pages&cad=3#v=onepage&q&f=false
  2. ijlalm

    O level Computer Studies (7010) -Problems

    thanks.. i have the fourth edition (the blue one)
  3. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    Maybe this will help Break every compound in ions except insoluble ones (you have to revise the solubility chart for that) for example BaCl2 + H2SO4 = BaSO4 + 2HCl Ba2+, Cl- , Cl-, H+,H+,SO42-=do not write BaSO4 in ions(insoluble) , H+,H+,Cl-,Cl- Cancel the same ions on both sides So Ba2+ +...
  4. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    For Question 10, as you know that 14 g of nitrogen contains 14/28=0.5 moles and 9g of water also contains 9/18=0.5 moles, hence option B is the correct option. For Question 12, In the choices C and D, the valency of the metal is +1 or +2.Choice D is not possible because in this case the Ar of...
  5. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    Yes its correct..BTW it was the question of the year 1975!!
  6. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    W11 question paper 11__5070 chemistry
  7. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    But the marking scheme says that the ans is B
  8. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    A certain quantity of electricity liberates 9 g of aluminium. The mass of copper liberated from copper(II) sulfate solution (Cu2+ ions) by the same quantity of electricity is: (Relative atomic masses: Al = 27; Cu = 64) A 9.0 g B 21.33 g C 32.0 g D 42.67 g E 64.0 g Anyone.. Help please!! Agar is...
  9. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    In a titration between an acid (in the burette) and an alkali, you may need to re-use the same titration flask. Which is the best procedure for rinsing the flask? ARinse with distilled water and then with the alkali. BRinse with tap water and then with distilled water. CRinse with tap water...
  10. ijlalm

    O level Computer Studies (7010) -Problems

    Iam currently using the book "Information Systems for you"... is it good for the preparation for the 7010 syllabus
  11. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    What are bistable and astable circuits? Explain in o level language please...The other websites gives a complicated explanation PS: What is a function of a transistor??
  12. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    (ii) is just to add an extra bit of knowledge.
  13. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    (i) Electrical Energy from the main supply converts into chemical energy which eventually gets stored in the battery. (ii) Electrical energy is converted to kinetic energy so sound energy is produced.
  14. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    http://books.google.com.pk/books?id=W1nHB3WcyOEC&pg=PA48&source=gbs_selected_pages&cad=3#v=onepage&q&f=false can anyone answer the MCQ 50 of the topic "Energy, Work and Power"???...Even a tukka would count!!
  15. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    BTW I have a question.. Could anyone explain November 08 physics, paper 2, 7(b)...the question is quite arduous.. http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Physics%20(5054)/
  16. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    If the electrodes are made up of different metals such as magnesium and copper,a voltage or emf would be detected by the voltmeter.The more reactive metal would dissolve in the solution and change into ions,thereby producing electrons. As electrons are produced.that metal becomes the negative...
  17. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    Thanks a lot...........
  18. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    REALLY CONFUSING CHEMISTRY A 10 cm 3 of a gaseous hydrocarbon is completely burnt in oxygen.The total volume of the products is 70 cm 3. All gas volumes are measured at r.t.p. Which equations represents the combustion of the hydrocarbon? A) CH4 (g) + 2O2 (g) = CO2 (g) + 2H2O (g) B) C2H4 (g) +...
  19. ijlalm

    Biology; Chemistry; Physics: Post your doubts here!

    How can a car have a constant speed but changing velocity..Physics_Kinematics... PLEASE HELP!! And how can a free falling body have a constant acceleration but zero velocity???
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