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Search results

  1. ahmed abdulla

    UKCAT 2013

    hello, did any one do the ukcat exam for this year .? how was it ? is it easier compared to the previous years? i am totally frightened of the ukcat exam because everytime i get low marks and dont finish the exam in time! if any person did it , tell us how was it plz >>> i will 've it in less...
  2. ahmed abdulla

    ukcat question

    hi , as u all now ukcat isnt as easy as school exam ... i find difficulty in understanding a graph . if someone can help me that will be great " eg .if to go from athens to london .. what will be the distance ?
  3. ahmed abdulla

    ucat

    hi everyone , i am going to register for ucat ,,,, i want some good websites for practising plz ...
  4. ahmed abdulla

    A level Biology: Post your doubts here!

    can u solve it plz
  5. ahmed abdulla

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Which element has an equal number of electron pairs and of unpaired electrons within orbitals of principal quantum number 2? A beryllium B carbon C nitrogen D oxygen
  6. ahmed abdulla

    Physics: Post your doubts here!

    can some one plz do q 10 ,16 ,21 ,39 of oc/nov 2012 va'12
  7. ahmed abdulla

    Physics: Post your doubts here!

    can u help :)
  8. ahmed abdulla

    Physics: Post your doubts here!

    >>>>???
  9. ahmed abdulla

    Chemistry and Physics AS paper 12 MCQS

    A student calculated the standard enthalpy change of formation of ethane, C2H6, using a method based on standard enthalpy changes of combustion. He used correct values for the standard enthalpy change of combustion of ethane (–1560 kJ mol–1) and hydrogen (–286 kJ mol–1) but he used an incorrect...
  10. ahmed abdulla

    Chemistry: Post your doubts here!

    10 A student calculated the standard enthalpy change of formation of ethane, C2H6, using a method based on standard enthalpy changes of combustion. He used correct values for the standard enthalpy change of combustion of ethane (–1560 kJ mol–1) and hydrogen (–286 kJ mol–1) but he used an...
  11. ahmed abdulla

    Chemistry and Physics AS paper 12 MCQS

    40 An organic compound, X, will react with an excess of calcium metal to produce a salt with the empirical formula CaC4H6O4. What could be the identity of X? 1 ethanoic acid 2 butanedioic acid 3 methylpropanedioic acid answer is one only.. but i cant understand how 2 carbons changed to 4 ...
  12. ahmed abdulla

    Chemistry and Physics AS paper 12 MCQS

  13. ahmed abdulla

    Chemistry: Post your doubts here!

    looking at first choice .. it says its saturated (no double bond-alkane) and diol ( 2 OH group) it has 4 carbon ,, you know alkane with 4 carbon (butane) has formula C4H8 .. in this case replace 2 hydrogen with OH group (since its diol) this gives you C4H6 (OH)2 which has molecular formula of...
  14. ahmed abdulla

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    can u help bro
  15. ahmed abdulla

    AS Physics P1 MCQs Preparation Thread.

    my pleasure ;)
  16. ahmed abdulla

    AS Physics P1 MCQs Preparation Thread.

    use total momentum before collision=total momentum after collision therefore, 2*2=1*v therefore speed of 1 kg trolley is 4.. now u have mass and velocity of both trolleys , right ? find kinetic energy of both ... and simply add them ! hope that helps ! ;)
  17. ahmed abdulla

    AS Physics P1 MCQs Preparation Thread.

    i think u didnt understand ;) here is better expaination vertical velocity= u cos 45 horizontal velocity = u sin 45 so, initial K.E. : the vertical and horizontal components of kinetic energy = 1/2 m ( u cos 45 ) + 1/2 m ( u sin 45 ) ......... ( 1/2 m v^2 formula ) so, sin 45 = 0.71...
  18. ahmed abdulla

    AS Physics P1 MCQs Preparation Thread.

    q14 at highest point, its vertical velocity is zero, and horizontal speed remains same, let initial velocity is V, then K.E. is 1/2mV*2 at highest point horizontal velocity is V / root2 so K.E. = 1/2mV*2 x 1/2 ie .05E
  19. ahmed abdulla

    AS Physics P1 MCQs Preparation Thread.

    q q13 use torque=tension * radius
  20. ahmed abdulla

    AS Physics P1 MCQs Preparation Thread.

    what i was doing .. solving the simultanous eqn wrong :eek: any way thanks :) what about this ? An electric power cable consists of six copper wires c surrounding a steel core s 1.0 km of one of the copper wires has a resistance of 10 Ω and 1.0 km of the steel core has a resistance of 100 Ω...
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