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  1. M

    Physics Paper 1 2011 Discussion Thread

    0.5fx gives u strain energy..but where u draw it to scale..the line that forms traingle is below that curve..so u shud use ur sense that it must b greater than 0.10J...therefore 0.11J..!!
  2. M

    physics mcq help

    Actually one hour is more than enough even we dont use formulas..!! anyway..no prblm man!! :)
  3. M

    Physics Paper 1 2011 Discussion Thread

    the answer for this graph is B..jus think urself..R=rho*l/A...and rho is increasing so does l...whereas A is constant..so R is increasing...and I is same there..so Voltage needs to decrease....now jus put the value urself....jus for 1st keep rho and l=1 urself....for 2nd keep 2rho and l=2..do...
  4. M

    physics mcq help

    thats the same thing i said...!! actually..formula may not work..but these concepts work..as far as u have concept...use that..u dont need formula for solvin.!!
  5. M

    Will Physics MCQ's repeat this year June 2011?

    obv it will...from 3 to 4 question does repeat each year..!! this is an usual record..!! it may not..or it may repeat more than this too!!
  6. M

    Physics MCQs thread.

    m1u1+m2u2=mv( Now m taking 60m/s as positive..so 40m/s will b negative...these are jus direction...so while calculating u need to care bout sign..if u do assume a direction as positive..other direction will b negative..so) 60m-40m=2mv or 20=2v' or v=10m/s!!
  7. M

    Physics MCQs thread.

    yeah..1 is enough..!!
  8. M

    Physics MCQs thread.

    13D...gravitation is always equal!! 14D...calculate force in that direction in which person is pushing..which is 400N...so work done=400*1.5+150=750
  9. M

    Physics MCQs thread.

    i didnot understand the question ...haha..!! and hit thanks button if it has helped u dude..!!
  10. M

    Physics MCQs thread.

    its C..its so simple...1 and 4 involves units...whereas number 2 is wrong..so its obv that its C..!!
  11. M

    physics mcq help

    i too wanna know this..!! but my logic is this..!! for upper total resistance=1500 whereas for lower total resistance=3000...resistance in 1st is half the 2nd...so in 2nd...1/3 of total voltage moves..means 1/3 of 12=4..and for other..2/3 of 12= 8...now difference between them is 4V..giving u...
  12. M

    Physics MCQs thread.

    @nerd07: for 34....u use wire of length 800m..therefore has resistance of 800*0.005=4ohm...so minimun e.m.f=V+Ir=16+(0.6*4)=18.4V thus C.!! i dont know rest of the questions!!
  13. M

    Physics MCQs thread.

    @cocospaniel: sorry dude, from my side ..i cannot help u,...i dont have any idea( for varient 12) if u are talking other varient..let me know..will try!!
  14. M

    Physics MCQs thread.

    for 22..we can use unitary method bcoz this xtension and force has linear relation...so for 3m of x= extension is 1.5mm...therefore for 1m of x= extension is 0.5mm.. Similarly, for y 1m=1mm..so 3m=3mm..total extension, therefore, is =3mm+0.5mm=3.5mm!!
  15. M

    Physics MCQs thread.

    for 9..its C...first use v^2-u^2=2as where V=0 and u remains u and S=x and a shud b calculated..and from that we get a= -u^2/2x.... now question says no change in deceleration...so using that formula again...v^2-u^2=2as where v=0 again..and u1=1.2u(since the speed in increased by 20%)...and s...
  16. M

    Physics MCQs thread.

    for 36..its B...the three resistance in the right are in series..as a current passes through the 1st passes through other two..so it gives u total of 30ohm ...which is now parallel to 10ohm..so its combine resistance is 7.5 thus B!
  17. M

    Physics MCQs thread.

    for 27..its D...defn of Electric field strength
  18. M

    Physics MCQs thread.

    speed of light = 3*10^8m/s.... and 600nm=1 wavelength or, 3*10^17nm= 3*10^17/600 = 5*10^14 and therefore C
  19. M

    Physics Paper 1 2011 Discussion Thread

    @deathdealer: where are the questions dude?
  20. M

    phsics mcq question need help

    for x and y,length= l and 4l respectively...and area of x=v/l whereas area of y=v/4l so resistance of y/x = 4l/(v/4l) * (v/l)/ l giving u answer C
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