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  1. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    it cud be power or energy but yeah I get wht u mean by 2 pts .Power and ratio .Isn,t it a percentage we had to write tht as well?tht is multiplying by 100% did any one attempted question 3 sec B..Wht was change in graph of resistor compared to filament and how was the graph exactly of filament...
  2. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah thts wht baffledme..But looking at the wording we cant simply deny the possibility on pretext it,s a 1 mark..It said increased by F...Wht abt the refractive index question tht was quite tough to make a link...
  3. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    well, ia m talking abt the 2 pts...For me percentage useful energy/raw input power 2.wrote the formual..3.Thus tells the usefulness of a particular system Coz MS esp of oct 2013 are strict abt definitions and 2 marks implies for mr two distinct poin ts :|
  4. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    117for me ...I was confused when it was of 1 mark? Wht abtr tht efficiency question wht do u reckon wud be th 2 marks/2 points?
  5. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    Now tht,s wht I call a paper(only P2) how did it go for u all. What abt tht piston question Wht was the value of F.did we have to subtact the value
  6. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    I don't know if it was only me or not.But I had been given no info abt centripetal force whtsoever except tht it,s perpendicular and all tht.I hooked it up on the internet and must say tht I have grasped tht concept fully.Needless to sya,A more detailed study abt this force shud have been...
  7. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    EMF is of an electrical source.Consider a battery,it will have an e.mf of say 8V it means tht every coulomb charge it drives round a circuit the Charge(1 C) will carry 8 joules of electrical energy or that it supplies 8J of energy to every Coulomb...Voltage is the unit and frm definition it can...
  8. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    they R bending inside the lens..all the rays(excluding one passing thru the centre of course)
  9. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

  10. M.Omar

    I know thnx....There is just one more thing I wud ask u..Not today but tomorrow..It wud take not...

    I know thnx....There is just one more thing I wud ask u..Not today but tomorrow..It wud take not more than 15 min,if u r not bothered
    • M.Omar
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  11. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    So u got it I presume? Cant make out if u did so otherwise:P,
  12. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    So? It, is not like they have to converge at focal point ..they have already told us tht image is formed so two rays from same point will meet at the same point on the screen to produce the image..Passing frm centre shows where the image head wud be and the second line which can be drawn to any...
  13. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    It cancels the moment but NOT the weight..See tht,s the confusing part. But let me illustrate. Consider a balanced metre rule on a pivot(50 cm mark) now two weight are added on opp sides of pivot such tht they balance overall.Does the pivot exert no force? No infact it wud exert force to oppose...
  14. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    and u said it was relatively easy.:P
  15. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    Of course since electric potential is expended due to high resistance of voltmeter(P=I *R) it wud register a p.d
  16. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    The pivot does not balance the ruler,the moment provided by newton meter equalizes the other moment.Of course the meter exerts a foce but tht force only creates an opposing moment and dose not cancel the weight force of the object as it is not in line with weight..Like I said earlier if it were...
  17. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    Depends upon the relative resistance and how gr8 the resistance difference is
  18. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    really close since the voltmeter voltage is really high relative to the bulb..Apply the voltage fraction formual in series and u will find tht p.d of voltmeter is wud be really close to e.m.f even with a lamp
  19. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    No lol It will infact be really high close to power supply provided it is the only load ootherwise just really high
  20. M.Omar

    Biology; Chemistry; Physics: Post your doubts here!

    It increases since the resistance of voltmeter is really high (higher than lamp of course) and as it measures the potential difference btw 2 points(which are still intact) the Charges loses a lot of electric potential as it passes thru voltmeter giving a high p.d(electric potential refers to...
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