Install PhysicsKerala Android Application

CSIR UGC NET, 2012 December 23, Question Paper, Download, Answer Key, Answers, solutions, Explanations, Comment Here

►CSIR UGC NET, 2012 December 23, Question Paper, Download, Answer Key, Answers, solutions, Explanations, Comment Here

Home » 2012 » Answer Key » Download » UGC CSIR NET » UGC CSIR NET-Question » CSIR UGC NET, 2012 December 23, Question Paper, Download, Answer Key, Answers, solutions, Explanations, Comment Here
Would you like to subscribe through facebook

www.physicskerala.blogspot.com 2o12

UGC CSIR NET 2012 December 23 Answer Key Comment here with explanation
We can complete the answer key of physics with your help.
Please comment the key only if you are sure about the answer, and also give the explanations regarding your answer.

Enter Your E-mail ID

Comment the answers, solutions, and explanations....

Let your friends know about this page
Click Here & Post this to Facebook
Hi, friends there lot of comments, can't moderate on time.. please comment detailed answer and do not comment same comment again and again if your comments are not appearing. Please wait some more time...
- Physics Kerala

Posted by our guest writer S. If there is any content violations Report the Administrator by clicking "Report Problem".

305 comments:

  1. partc:uncertainity in momentum question:ans was square root h/2mw....is it correct?

    ReplyDelete
    Replies
    1. This comment has been removed by the author.

      Delete
    2. It is definitely squre root of h/2mw

      Delete
    3. right. there is a square root...

      Delete
  2. i think it ws sq root h/4mw

    ReplyDelete
  3. 2by2 unitary matrix with det exp(imphi) to be converted to matrix with det 1?
    multiply a row or column by exp(-imphi)

    chemical potential for Bose Einstein condensation...is it zero?

    unit normal vector to given equation of eclipse?

    ReplyDelete
    Replies
    1. Option A for ellipse question.. what is your answer?

      Delete
    2. yeah it was zero 100 percent right for boson gas

      Delete
    3. the chemical potential for boson is -Ve

      Delete
    4. i think its 1/2 hw because in case of HO ground state energy is not 0. In case of BEC chemical potential is lowest eigenvalue (energy)

      Delete
    5. But there is also a condition for BEC . chemical potential value is less than ground state energy value ...

      Delete
  4. a thermodynamic process occurs by 2 ways-AtoC and AtoB toC.amount of heat in 2nd...is answer 80J?

    life time of particles in decreasing order...p,n,pie,delta?

    ReplyDelete
    Replies
    1. energy extract is 80 j

      Delete
    2. internal energy is path independent but both work done and heat are path dependent quantities . with this in mind first calculate internal energy using formula dQ=dU+dW . then with that internal energy calculate dQ .
      I didnt remember the exact value. I too think 80j

      Delete
  5. section-A
    length of pavement-300m
    graph for dis covered by snail-D choice..the graph with negative slope.
    length on earth of river in semicircle...11km
    rectagular figure...distance PQ=15/4
    area of triangle?
    smallest number exp(-1/exp)or .33^.33 or .44^.44or pie^(x-1/pie)

    ReplyDelete
    Replies
    1. graph for dis covered by snail-C choice..time will not be go back

      Delete
    2. yes snail-C time will not go back

      Delete
    3. yes answer c is correct time cant be decreased

      ]

      Delete
  6. minimum days between fridays 13 to 13....28

    ReplyDelete
    Replies
    1. In leap year it won't be 28.

      Delete
    2. no it is 91 days including leap year

      Delete
    3. yes..91 days is the right answer.

      Delete
    4. I think it would be 56 days

      Delete
    5. definitely answer is 91 days

      Delete
    6. Start from 13th January Friday. You will reach 13th April Friday with February 29 days. So 91 days.

      Delete
    7. 91 as it is a common factor of 7 and 13

      Delete
  7. unit normal is option D I+J+K/sq3..because its a special case whn a=b=c u have to take this one

    ReplyDelete
    Replies
    1. was that mention in the question that a=b=c??? i didn't remember .

      Delete
    2. in unit normal vector it will be option A....you have to take gradient and then satisfy the points given...u will get option A.

      Delete
  8. the ratio between triangle area is 1:2
    hexagonal problm is sq2*a
    25%of25% 0f x where x ix6.25%
    cucumber is 99kg

    ReplyDelete
    Replies
    1. cucumber : 50kg is the right answer

      Delete
    2. 1:3, sq2*a, 6.25 , 99kg

      Delete
    3. cucumber problem...

      first water 99% others 1% total weight 100kg... ie 99kg water 1 kg others

      after 30 days water 98% and others 2%...
      1 kg others remains same till now
      so suppose x is the total weight now
      ie 2% of x is 1 kg
      x * 2/100 = 1
      x=100/2 =50kg

      right...??

      Delete
  9. part B harmonic oscilator problm with (a-x) ans is (n+1/2)hw+1/2aw2....u have solve it exactly this is the total correction..obviously those who calculate 1st order correction they must argue that ans =(n+1/2)hw but they asked total correction either if u do it by quantum mechanically u hv to go upto 2nd order...(Zetly quantum mechanics)

    ReplyDelete
    Replies
    1. but expectation value of x operator is zero so this part will not contribute what i think/

      Delete
    2. This comment has been removed by the author.

      Delete
    3. if you do 2nd order PT you will get non zero term...i think

      Delete
    4. i think no effect of perturbation

      Delete
  10. logic gate choice is A.B whole bar

    ReplyDelete
  11. modulation problem answer is 6.99 MHz to 7.01 MHz

    ReplyDelete
    Replies
    1. I think it would be 7.0 to 7.01 MHz, as the AMPLITUDE modulation would not decrease the frequency.

      Delete
  12. direction problem answer is south east

    ReplyDelete
  13. I think the op-amp answer is 10 Hz and (Pi)

    ReplyDelete
  14. the distance along the semi circle is 5.5 km

    ReplyDelete
    Replies
    1. yes.. 5.5km is the correct answer.. Mine is also that... best of luck

      Delete
    2. yes that is the right answer

      Delete
  15. Least value is e^(~1/e)

    ReplyDelete
  16. friday 13 th to friday 13 th wont come for the problem .since it is a leap year.

    ReplyDelete
  17. i think for diode problem the answer is 8V

    ReplyDelete
  18. ratio of triangle area area is 1:3

    ReplyDelete
    Replies
    1. nope its 1:2 u have to do likt this
      tirADE=triABC-TRICBD
      now you will gate 3/2-1
      so its 1/2

      Delete
    2. but i have done by taking formula 1/2*base*height and since height of both triangles are same and base ratio comes out to be 1:3..isnt it correct?

      Delete
    3. Shruti it's 1:2
      U can do other way by roughly taking Hieght 3 and then assign/divide base in three equal parts as mentioned in Q uestion.
      Calculate area of whole rt. traianglle -subtract area of rt. triange having two/third of the base, ..U wil get area of the trainle .not right angled (as suggested by swaroop) and then compare with area of rt. trianle with base only two times it comes out to be 1:2.
      I would say not write comments on answer if U r not 100% confident

      Delete
    4. hmm but u knw u missed out one thing
      triADE=TRiABC-TRI CBD
      nw TRI(ADE)/TRI(CBD)=TRI(ABC)/TRI(CBD)-1
      now tri ABC=1/2base*height=1/2(3AD)*height
      abd triCBD=1/2(2AD)*height
      put this together u will gate
      TRI(ADE)/TRI(CBD)=3/2-1

      23 December, 2012

      Delete
    5. nope my account is blockd sorry.thats why i hv to dlt ...

      Delete
    6. Answer is 1:2
      It can be done the way Sruthi did also. Find the area using i/2*b*h and subtract one from another. You will get the answer.

      Delete
  19. perturbation problem: ans is 2ab ?

    ReplyDelete
    Replies
    1. yes, it is 2ab.....do you know the answer of the uncertainity in position problem of part B...is it square root of 5 X h divided by square root of 2...

      Delete
    2. yes it was square root 5x/squre root 2

      Delete
    3. thanks...for your reply....

      Delete
  20. length of spring is 10 power 3

    ReplyDelete
    Replies
    1. yup same answer for area 1sqr.m, diameter 1mm lenght of wire is 10 power 3

      Delete
    2. Yes. 10^3 is the answer

      Delete
  21. pole and diagonal problem the answer is sq.rt.2a

    ReplyDelete
  22. coin problem the answer is 1947 . Because in the museum old coins will be kept

    ReplyDelete
    Replies
    1. You really a physics student dear ?? csir made you fool ... the answer will be Year xxx B.C. ... because while printing that coin , none knew that after xxx years , Jesus Christ will born, so it cannot be true... Get it dear ?? All xxx A.D. are correct

      Delete
    2. Yes. Answer is 200BC.
      Because after Christ only people started counting year as before and after Christ

      Delete
  23. triangle problem pythagoras theorem is correct i.e sq.I=sq.II+sq.III

    ReplyDelete
    Replies
    1. correct

      Delete
    2. No
      It is I=II+III
      becz I,II,III are the area

      Delete
    3. Yes II+III=I is the right answer

      Delete
    4. This comment has been removed by the author.

      Delete
    5. This comment has been removed by the author.

      Delete
  24. what was the answer of partition function problem? any ideas about cutoff for JRf?

    ReplyDelete
    Replies
    1. U have to score at least 75 for ugc and for csir 85 and above

      Delete
    2. JRF 80 MARKS AND FOR LECTURERSHIP 70 MARKKS . THIS DATA IS APPLICABLE FOR GENERAL AND OBC.

      Delete
    3. on which basis u r telling the cut off?? is dre any norm about dat??

      Delete
    4. 45 marks last year cutoff for JRF for general.It may +/-5 this time also.

      Delete
  25. for fermi sphere problm u have to do like that
    V=4/3(pi)Ef^3
    now Ef=h^2/8m(3n)2/3 where n=N/V
    for fcc u have to take 4(multiplication factor) put all this in the volume equation divide by a3 u will get the ans .

    ReplyDelete
  26. for LS how much one need to b scored?

    ReplyDelete
    Replies
    1. SEE THE REPLY GIVEN ABOVE FOR SWARUP SANKAR

      Delete
  27. contour problem ans was -16i*pi or +16i*pi...does ans changes when given anticlockwise?

    ReplyDelete
  28. angular momentum problem (ml^2)w/2

    ReplyDelete
  29. gate problem y= (a.b)compliment

    ReplyDelete
  30. 5 marks qs ka answr..b=curla fr one answer..contour integral..i m confused if its anti clockwise then shud it be a minus with b option as answer.. Ebtropy is minimum? d d first qs of part b..is sqrt rawg/rawnoth..is it?

    ReplyDelete
    Replies
    1. anticlockwise contour is +ve
      entropy is max. at equilibrium for micro canonical

      Delete
  31. anybody remember that question of peacock and snake moving with same velocity, at what distance peacock will catch snake height 12m n distane of snake from base 36 m...?
    answer?

    ReplyDelete
  32. 25% of 25% is X%, so X is......i think its 6.25 %

    ReplyDelete
  33. This comment has been removed by the author.

    ReplyDelete
  34. the answer of fermi radius is (12pi square/acube)`1/3

    ReplyDelete
  35. the answer of uncertainty value of momentum (d)

    ReplyDelete
  36. answer of the graph i plotted in mathematica it is cosx/x

    ReplyDelete
  37. yes ans of that coin question may be 200BC

    ReplyDelete
  38. what is the answer for the 1.quasi irreversible prcess problem.....2.phase space volume and .......3.the uncertainity in position problem(part b).........plz reply....

    ReplyDelete
  39. i dnt think dat LS cut off will b above 62-65. Bcoz d qstn was bit tougher cmprd to d previous ones. Wat do other thinks?

    ReplyDelete
    Replies
    1. This comment has been removed by the author.

      Delete
    2. 45 marks for JRF last year

      Delete
    3. I think this time for JRF 60 to 65 and LS 50 to 55

      Delete
    4. not possible +/-5 may be I m sure







      Delete
    5. we can't guess about the cutoff

      Delete
    6. paper was easy but lengthy so there is a problem of time management

      Delete
  40. finding the missing letter the answer is Z

    ReplyDelete
  41. 1-prblem form Bose-Einstien condensate,Chemical potential for 3D isotropic oscillator
    Ans:3/2 hcros omega
    2-Volueme of fermi sphere
    Ans: (12pi^2/a^3)^1/3
    3-problem of binary stars, ratio of velocities
    Ans: root2
    4: Complex function Z^3/(z-2)(z-3)
    Ans: -16 pi i
    5. 6 spin half partices
    Ans: 14 hcross^2
    6. perturbation
    Ans: 2ba
    7. cosx/x plot
    8. Limit n-> infinity An+1/An
    Ans: 2
    9. 91 days in a leap year
    10. angular momrntu (ml^2 w)/4
    11.

    ReplyDelete
    Replies
    1. http://en.wikipedia.org/wiki/Bose%E2%80%93Einstein_condensate
      look this site ...you can see that chemical potential is zero for a BEC

      Delete
    2. In central forces angular momentum is conserved ie,mvr= constant then there is no possibility of root . ans is 2 :for binary stars problem

      Delete
    3. This comment has been removed by the author.

      Delete
  42. anyone from life science ??

    ReplyDelete
  43. plz provide life science que ??

    ReplyDelete
    Replies
    1. This comment has been removed by the author.

      Delete
  44. 14x+28y+42z wala que send kro..ans k sath

    ReplyDelete
  45. This comment has been removed by the author.

    ReplyDelete
  46. phase space trajectories wont intersect each other. Hence ans is the figure with intersected trajectories.(not remembering exact option ,i think b.

    ReplyDelete
    Replies
    1. option was of two circles independent of each other

      Delete
    2. not independent...intersecting each other is wrong one.

      Delete
  47. in part a :which of the distance vs time graph is not possible? it is the one with two distances occuring for same time ...

    ReplyDelete
  48. hydrogen atom problem:eigenvalue of Lz was h/8?

    ReplyDelete
    Replies
    1. yes....I have got the same answer

      Delete
  49. part a
    in odd city even city problem answer is odd number of odd city is not possible

    ReplyDelete
  50. part b
    in a 5 series test what is probability of winning toss by saying only heads and winning 3 and lose 2

    ReplyDelete
  51. by variational method with H=(-ћ^2/2m )d^2/dx^2 -α∂(x) find ground state energy with Ψ=Ae^-bx^2

    ReplyDelete
  52. what will be the ans of ising model problem?

    ReplyDelete
    Replies
    1. ground state wave function : sech2x

      Delete
  53. This comment has been removed by the author.

    ReplyDelete
  54. power across load resistance in solar cell?

    ReplyDelete
  55. 1. variation of vector potential inside and outside of solenoid? 2.time average of E square??

    ReplyDelete
  56. 1. relativity problem, distance travelled by muons?

    ReplyDelete
  57. wht is the value of n im eigen value problem?

    ReplyDelete
  58. This comment has been removed by the author.

    ReplyDelete
  59. please discuss more on part c physics csir net

    ReplyDelete
  60. what is answer of cities?

    ReplyDelete
  61. what was ans of lim n-infinity an+1/an?

    ReplyDelete

Comment.. and check "Notify me" for following comments to your email.

You are viewing PhysicsKerala, CSIR UGC NET, 2012 December 23, Question Paper, Download, Answer Key, Answers, solutions, Explanations, Comment Here Click Here for more Recent Updates... Question Papers and study materials..are available to download. Join the group and Help the group to Improve.
Last dates and details may be updated. Please visit the concerned website for more information.
Get Important Downloads , Enter E-mail
.
..

Search within Physics Kerala

Physics
 
Share (Get Blog Posts through SMS)(Join the GROUP - Download Study Materials) ^Top of the Page^
Android InstallJoin the group Enter your Email: (CLOSE)
TAMIL . Send an sms ON<space>PHYSICS43 to 9870807070 to join the sms group
Information about PHYSICS, CSIR UGC NET, 2012 December 23, Question Paper, Download, Answer Key, Answers, solutions, Explanations, Comment Here and more... Free Download Question Papers and study materials.. NB : The details given here are taken from various sources. Please Verify the contents and contact us for your valuable suggestions.