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  1. O

    LOGIC GATES? PHY P1??

    Logic gates are in the extended curriculum, so they're not included in paper1.
  2. O

    Physics Paper 1 question!

    B, they're in balance so they have the same weight and mass
  3. O

    Physics Paper 1 question!

    In that question one force was exerted on the end of the wood stick so in the direction of that force. As Moment = force * distance
  4. O

    Physics, Chemistry and Biology: Post your doubts here!

    no problem
  5. O

    Physics, Chemistry and Biology: Post your doubts here!

    I'm off for now, msg me so you can make sure that I see your questions.
  6. O

    Physics, Chemistry and Biology: Post your doubts here!

    q20) In deep water they are faster so the distance increases. in B there are more wavefronts so obviously they are slower which is wrong. q22) B, simple math as the normal makes a 90 angle so 90-30 = 60, the angle for mirror X is the same for mirror Y. q27) Magnetic field is from the north to...
  7. O

    Physics, Chemistry and Biology: Post your doubts here!

    M/J 2012 V12, Q18 ) Wood is an insulator, it so the side P is the lowest temp as no heat is reaching it and the hottest is Q as no heat is being conducted like R. So it is A. Think of it as a pipe that has a leakage at one end and one that doesn't which one will have more water ? Q33) The same...
  8. O

    Physics, Chemistry and Biology: Post your doubts here!

    14) They move " vibrate" they are not stationary so it is D 39) Keyword is nucleus, you have to read the question carefully. The nucleus has 2 neutrons and 2 protons. Very tricky question.:)
  9. O

    Physics, Chemistry and Biology: Post your doubts here!

    jun09 v.12 no.22 , why it's not D ?= It is C because a change in direction takes place. Q28 = B>D>A>C Nov09 v.12 no.16 , How it goes down ? i think it should be increase ? as pressure increase? no.23 , why it's not D 16)Yes pressure increases that is why the level goes down as the air...
  10. O

    Physics, Chemistry and Biology: Post your doubts here!

    Very hard to answer them as you didn't post the links the download links for the years, I will try.
  11. O

    Physics, Chemistry and Biology: Post your doubts here!

    q9) Is asking what type changes into heat energy to heat the water to become steam and move the turbines, nuclear energy is first transformed into heat to produce steam. So it is B. q14) You got this wrong it is the water evaporating not the remaining water, so they are semiclose then they...
  12. O

    Physics, Chemistry and Biology: Post your doubts here!

    No problem, feel free to ask anytime.
  13. O

    Physics, Chemistry and Biology: Post your doubts here!

    C, The anode is positive as it attracts electrons, you should know that and especially from chemistry, and it is not hot it is cool as the cathode is the one which is heated to release electrons. (y)
  14. O

    Physics, Chemistry and Biology: Post your doubts here!

    Yeah I was writing the answer. :)
  15. O

    Physics, Chemistry and Biology: Post your doubts here!

    q21) B,Speed of waves is less in shallow water, S=f*lambda. So if the speed decreases the frequency is constant so the wavelength decreases which brings the wavefronts closer together. q22) C, You have to draw a normal line in this question to help you, so the light enters it also slows down so...
  16. O

    Physics, Chemistry and Biology: Post your doubts here!

    1) It is not a MS from CIE, as I found other mistakes. 2) I re-solved the question and I see why it is the top pan balance, as all others depend on weight but not the top pan balance which depends on mass. Here I will explain them again; 11) When the water on the left side of the barrier is high...
  17. O

    Physics Paper 1 question!

    The density of the new liquid is more, so the change in height (h) is small compared with the h in the water, for that reason water is used ( or less dense liquids) in manometers where a small pressure change is present.
  18. O

    Physics, Chemistry and Biology: Post your doubts here!

    6) D, mass is always the same so we need a digital balance to give direct answers. 11) I'd say D also as the "pipe" is on the bottom and water level on the other side is low. 33) A, as the fuse can take 12A and the cable takes 5A only so it will over heat and melt the insulation. btw the...
  19. O

    Physics, Chemistry and Biology: Post your doubts here!

    For Q21, the answer is A because the angle of refraction is bigger than the incidence as it is from glass to air. Also it is not totally refracted some is reflected. It's not B because the angle of incidence is less than the critical angle. It's not C because speed of light is faster in air so...
  20. O

    Physics paper 1 question

    I don't remember the question, sorry.
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