• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. Q

    Physics: Post your doubts here!

    In the circuit shown, let the current be I1 I1=V/R=6/2R Power dissipated in external resistor (P1)=I1*I1*resistance of external resisitor=(6/2R)*(6/2R)*R= 36R/(4R*R)=9/R in the circuit with negligible internal resistance, let the current be I2 I2=V/R=6/R so power dissipated in xternal...
  2. Q

    Physics: Post your doubts here!

    can anyone please explain q3 b(III) in the following paper? http://revision.peterhouse.co.zw/Physics/AS%20Level%20Physics/Paper%202s%20%20&%20Mark%20Schemes%20June%20&%20Nov/9702_s12_qp_21.pdf
  3. Q

    A level Biology: Post your doubts here!

    the answer is A because peptide bonds form only between COOH n NH2 grps which are attached to the central carbon atom. Grps 2 and 5 are part of the R grps of the two amino acids and hence cannot be involved in peptide bonding. these grps may be a part of the tertiary and quaternary structures of...
  4. Q

    A level Biology: Post your doubts here!

    the edition i m tokin abt is the third one, it must be in urs as well, eider at the end of transport in mammals or the heart chapter.....btw i am a sister ...
  5. Q

    A level Biology: Post your doubts here!

    anyone pls!!!
  6. Q

    A level Biology: Post your doubts here!

    P represents the contraction of the atrial walls, so it rrepresents the excitation wave sweeping ovr the atrial walls in response to which they contract. Q,R and S represent the wave sweeping ovr the ventricular walls which cause them to contract, and T represents the rrecovery of the ventricle...
  7. Q

    A level Biology: Post your doubts here!

    see d pollen grain at the far left had its pollen tube growing parallel to the eyepiece graticule so we calculate the increase in its length ovr d 4 hr period, which is 8 divisions. 50 divisions on graticule>0.1 mm 1 division>0.002 mm so increase in pollen tube's length= 8 * 0.002=0.016 mm...
  8. Q

    A level Biology: Post your doubts here!

    5th ryt? B is wrong bcz both mitochondria and chloroplasts have 70S ribosomes similar to that in prokaryotes. C is correct cz all mitochondria, chloroplasts and prokaryotes have small circular DNA molecules.
  9. Q

    A level Biology: Post your doubts here!

    th answer is A(A and AB) cz if O and B blood grp ppl receive A grp blood, they wd produce antibodies agnst A blood cells cz A antigens wd be recognised as foreign.
  10. Q

    A level Biology: Post your doubts here!

    check d answer agn, it is C. i jst dd
  11. Q

    A level Biology: Post your doubts here!

    can anyone please help me with q25, q31, 33 and 39? in 33, shdnt C be the answer cz patients can be yunger than 30. In 39, is A d answer cz soil condiditons donot really make a difference to nitrogen fixing bacteria as dey r in d nodules...
  12. Q

    A level Biology: Post your doubts here!

    it is C because CO combines irreversibly wd Hb< preventing it from combining wd Hb. So it shdnt really have any effect on diffusion rate of oxygen and CO cannot prevent oxygen release anyhow
  13. Q

    A level Biology: Post your doubts here!

    what about the vena cavae, should not a decrease in their blood pressure stimulate a rise in the cardiac output? shouldn't a well developed heart muscle mean a high pulse rate, cz that would mean the heart is pumping efficiently? plasmodium can be passed across the placenta (thats what my book...
  14. Q

    A level Biology: Post your doubts here!

    can anyone please help me with the following questions? q 26, 32 and 34 in O/N 2002 http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w02_qp_1.pdf
  15. Q

    Physics: Post your doubts here!

    Salam! what does this mean"the oscillation died away"?
  16. Q

    Physics: Post your doubts here!

    Salam! Can someone please help me with Q25 in this paper? http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s09_qp_1.pdf
  17. Q

    Physics: Post your doubts here!

    Shdnt the elastic limit be exctly at T, bcz if force equivalent to the value of force at T is applied, the wire still regains its original shape and length?
  18. Q

    Physics: Post your doubts here!

    salam! Can sum1 please explain the following? q23 in May june 2012 p23. i understand as to why is it C, but not why the other choices are incorrect. http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_11.pdf q20 in May june 2011 paper 11...
  19. Q

    Physics: Post your doubts here!

    Can someone please explain Q16 in this paper? http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_1.pdf N also Q15 http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s10_qp_11.pdf
  20. Q

    Chemistry: Post your doubts here!

    When asked to write about how temperature affects rate, do we mention the Boltzmann theory? Can we just not write that kinetic energy increases so collision frequency increases? please mention all d details dis answer should state..
Top