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JEST 2012, Question Paper, Download, Answer Key, Pdf File 19 February - Discuss the Answers

►JEST 2012, Question Paper, Download, Answer Key, Pdf File 19 February - Discuss the Answers

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35 comments:

  1. The net electrical charge of the semiconductor material is zero.

    ReplyDelete
  2. Part B
    probability ans 2/9
    distance betwetn latice plane ans 4 A
    resistor ratio ans N^2
    angle of refractd beam ans 56.7
    Rms error 3.3%
    period of pendulum ans 2T/sprt5
    ground state of 5 identical particles 5hw
    orthogonal ans -exp(-i phi) cosx +sinx
    N.N matrix ans one eigen value N Other 0
    canonical pair ans q2,-p2
    wave fn ans parity operator
    efficency ans 1
    electic fild for r>R ans -BR2/2r theata
    PART A
    electic fild ans -vB(14j+7k)
    integral ans e-1/e
    temp aftr compres ans 887
    series converges to pi/4
    magnetic field in othr inertial frame E2=B2
    Change in entropy ln(T1+T2/2SQRT(T1T2))

    ReplyDelete
  3. ********three mark question*******

    consider a particle of mass m moving inside a two-dimensional square box: ans-(c)5(hcut)^2/(2mL^2)

    a monoatomic ideal gas at 17 degree: ans- (d) 887 degree

    an observer in an inertial frame finds that: ans- (b) E.B= 0

    a magnetic field B=B0(i+2j-4k): ans-(d) E=-v0B0(14j+7k)

    define (sigma)x = (f'+ f) & (sigma)y = (f'- f): ans-(b) 2f'f-1

    an electric in a region is given by E(x,y,z): ans-(c) 13,1,6

    consider an ideal gas of mass m at temperature T1: ans-(a)

    consider the bohr model of the hydrogen atom: ans-(d)

    ********one mark question******

    the ground state energy of 5 identical spin-1/2: ans-(b)

    efficiency of perfectly reversible: ans- (d) 1

    a point charge +q placed at (0,0,d): ans- (d)

    what is the value of the series: ans-(d) 1

    the second order maximum in the diffraction: ans-(c) 4 Ang

    the spatial part of a two-electron state: ans-(c)

    the ratio of maximum to minimum resistance: ans-(b)

    the wave function of a free particle in one dimension: ans-(d)

    the net charge of a n-type: ans-(b)

    the length and radius RMS error: ans-(a)

    when unpolarised light is incident: ans- (a)

    if the co-ordinate q and the momentum p : ans-(c)

    the quantum state sin x... : ans-(d)

    the binding energy of positronium: ans-(a)

    for an N*N matrix: ans-(d)

    an unbiased die : ans-(b)

    a cube has a constant electric pot. V : ans-(a)

    a girl measures the period of simple pendulum: ans-(c)

    a sodium atom in the first excited...corresponding line-width: ans-(b)

    consider a particle of electric charge e... its trajectory: ans-(a) or (c)

    ReplyDelete
  4. R series..
    3. d
    5. d
    9. c
    10. a
    12. b
    14. c
    16. c
    17. c
    20. b
    22. 0
    24. a
    25. d
    26. c
    27. c
    29. b
    30. d
    31. d
    32. b
    34. d
    35. a
    36. d
    37. b
    39. b
    42. c
    43. d
    45. d
    47. b
    48. a
    49. a
    50. c

    ReplyDelete
  5. R series..
    3. d
    5. d
    9. c
    10. a
    12. b
    14. c
    16. c
    17. c
    20. b
    22. 0
    24. a
    25. d
    26. c
    27. c
    29. b
    30. d
    31. d
    32. b
    34. d
    35. a
    36. d
    37. b
    39. b
    42. c
    43. d
    45. d
    47. b
    48. a
    49. a
    50. c

    ReplyDelete
  6. PLEASE dont just tell the question no and the key since there are the series of booklet. It is better to tell the answer with some hint.

    ReplyDelete
  7. please do not post according to question no. because there are three sets available...try to mention questions..

    ReplyDelete
  8. Set p

    5.d
    6.c
    10.d
    12.a
    13.c
    14.c
    17.c
    18.b
    20.a
    22.b
    25.a

    27.b
    28.d
    29.d
    31.c
    32.b
    33.d
    34.d
    35.d
    36.c
    39.c
    42.b
    43.c
    44.b
    48.a
    49.d
    50.d

    any corrections . Pls comment on this key

    ReplyDelete
    Replies
    1. Anonymous11 July, 2014

      answer of 34 is not correct...the answer is c..that is magnitude of the field is zero,,,,,

      Delete
  9. series R 3D,9D,10B,14C,17C,19B,25D,31D,34C,35B(NT SURE),37B,44A,47B,48C,49C..PLZ CHECK N CORRECT IF RQURD.

    ReplyDelete
  10. ans for Q-set jest-19th feb 2012
    2)a (May Be)
    4)d
    5)c (May Be)
    6)c
    9)d
    10)c (May Be)
    11)a
    15)a
    19)c
    20)b
    21)a
    22)b
    23)a
    27)b
    28)d
    29)c
    30)d
    33)c
    34)b
    35)d
    37)c
    38)c
    39)b
    41)b
    43)b
    46)c
    47)d
    49)d

    ReplyDelete
  11. Q49 ANSWER IS d series q

    ReplyDelete
  12. Question no. 27
    ans. C

    no.31
    ans. C
    no. 32
    ans. B
    no.34
    ans. A
    no. 36
    ans. C
    no.40
    ans. B
    no.42
    ans. C
    no.44
    ans. C
    no. 49
    ans. D

    ReplyDelete
  13. QUESTION NO. 1
    ANS. 887
    QUESTION NO. 2
    ANS. E.B=0
    QUESTION NO. 4
    ANS. X2/2-SQRT(2)XTANH(SQRT(2)X)
    QUESTION NO. 5
    ANS. E=-VoBo(14j+7k)
    QUESTION NO. 6
    ANS. BECOMES APERIODIC
    QUESTION NO. 7
    ANS. Rf=Ro/2
    QUESTION NO. 10
    ANS. ac
    QUESTION NO. 11
    ANS. 3h2/2ML2
    QUESTION NO. 12
    ANS. 2mCpln(T1-T2)/2SQRT(T1T2)
    QUESTION NO. 13
    ANS. 0.9c
    QUESTION NO. 17
    ANS. 45,6,1
    QUESTION NO. 18
    ANS. 1
    QUESTION NO. 20
    ANS. INFINITE
    QUESTION NO. 23
    ANS. Vo/2(1-EXP(-t/2RC))
    QUESTION NO. 24
    ANS. ONVERGES TO UNITY
    QUESTION NO. 25
    ANS. h=k=l
    QUESTION NO. 26
    ANS. MOVES WITH A CONSTANT DECELERATION
    QUESTION NO. 28
    ANS. 1
    QUESTION NO. 32
    ANS. N2
    QUESTION NO. 33
    ANS. HAMILTONIAN
    QUESTION NO. 34
    ANS. q/16PIEoD2
    QUESTION NO. 35
    ANS. 1
    QUESTION NO. 36
    ANS. 4 A
    QUESTION NO. 40
    ANS. ZERO
    QUESTION NO. 41
    ANS. 3.3%
    QUESTION NO. 42
    ANS. 23.3
    QUESTION NO. 43
    ANS. >>300K
    QUESTION NO. 44
    ANS. 1/9
    QUESTION NO. 45
    ANS. 0
    QUESTION NO. 46
    ANS. 2T/SQRT(5)
    QUESTION NO. 48
    ANS. 13.6/2
    QUESTION NO. 49
    ANS. ONE EIGEN VALUE=N, THE OTHER=0
    QUESTION NO. 50
    ANS. 1.7 * 10(6) HZ

    ReplyDelete
  14. anybody have computer science answer key....

    ReplyDelete
  15. @Anonymous

    qn 50 of p series ans is"b"

    ReplyDelete
  16. vishal sir,23 17 etc are correct?? i think dey need correction.:(

    ReplyDelete
  17. @evan

    hello evan ,
    please check quest. 39 of r series booklet....unpolarised light....
    its answer is (b) 33.4 degree
    not 56.7 degree
    please give me a hint about quest. 4 (changes sign underexchnage of x & y)
    , quest. 29 (ground state of harmonic oscillator)
    quest 38(rms error)

    urs all other questions are perfect.
    best of luck

    ReplyDelete
  18. @prashant
    sir can u jst cmment on q2,18,22,10,24,23 set r.. plzz

    ReplyDelete
  19. anyone set r,perfect answers for part b q28,26,46,48..

    ReplyDelete
  20. @prashant for one dimensional harmonic oscillator he has given 5 particles and he said spin - 1/2
    so they are fermions
    he has not mentioned the spin state
    so 2 particles for one state so,
    (2hw/2+6hw/2+5hw/2)=13hw/2

    ReplyDelete
  21. @Anonymous
    ques (2) entropy of the system (a)
    ques (10) simple pendulum (c)
    ques (23) infinte series (c)
    ques (24) bcc crystal (a)

    ReplyDelete
  22. @Anonymous
    set r
    (28) small magnet(a)
    (46) debye temp. (a)
    (48) potential of cube (a)

    ReplyDelete
  23. can anyone answer the question 25 of set Q in which we have to find the entropy of a two level system with energy E1 and E2 each with degeneracy g1 and g2 , and probability p1 and p2

    ReplyDelete
  24. series R
    Q1...(b)
    Q3...(d)
    Q4...(c)
    Q5...(d)
    Q6...(b)
    Q7...(d)
    Q9...(c)
    Q10...(b)
    Q12...(b)
    Q14...(c)
    Q15...(a)
    Q16...(c)
    Q17...(c)
    Q21...(b)
    Q22...(a)
    Q23...(c)
    Q24...(a)
    Q26...(a)
    Q27...(c)
    Q28...(d)
    Q29...(d)
    Q30...(d)
    Q31...(d)
    Q33...(c)
    Q34...(c)
    Q36...(d)
    Q37...(b)
    Q39...(a)
    Q40...(c)
    Q42...(c)
    Q43...(d)
    Q44...(a)
    Q45...(d)
    Q46...(a)
    Q47...(a)
    Q48...(a)
    Q49...(c)

    ReplyDelete
  25. megharaj

    all the ans quoted here for spatial part of two-electron state is (c) which wrong, correct ans is (d) becoz itz a symmetric state.

    ReplyDelete
  26. Can anyone please tell me that when is the result expected & hw much marks is the good enough to get admission..kindly tell soon

    ReplyDelete
  27. @Nagendra Shiwakoti Ans to probability question is 1/9 because they ask for positive diff. between two numbers.

    ReplyDelete
  28. SET- R

    Q.No
    1:- ( )
    2:- ( )
    3:- (D)
    4:- (C)
    5:- (D)
    6:- ( )
    7:- ( )
    8:- (B), here put value of w.f. in S.E. and take energy as additive constant.
    9:- (D), Since F= q(E+v*B)=0 => E=-(V*B).
    10:- ( )
    11:- ( )
    12:- (B)
    13:- (C)
    14:- (C), Since for Electrostatic field Curl of E = 0
    15:- (A)
    16:- (C), (5/V)=5micro Sec/Sqrt(1-V^2/C^2)
    17:- (C)
    18:- ( )
    19:- (B)
    20:- ( )
    21:- ( )
    22:- (A)
    23:- (C)
    24:- (A)
    25:- (D), First reduce the circuit using thevenin's theorem after that solution is straight forward.
    26:- (C), Electic force >>>> gravitational force.
    27:- ( )
    28:- ( )
    29:- (D), fill up to n=4 energy levels because H.O energy levels are non degenerate.
    30:- (D), Efficiency= 1-T2/T1 and t2=0 here.
    31:- (D)
    32:- (D), A2-B2=(A-B)(A+B) then first term becomes exp(X) & 2nd term becomes exp(-X).
    33:- (C)
    34:- (C)
    35:- (B)
    36:- (D)
    37:- (B)
    38:- ( )
    39:- ( )
    40:- ( )
    41:- ( )
    42:- (C)
    43:- (D)
    44:- (A)
    45:- (D)
    46:- (A)
    47:- (A)
    48:- (A)
    49:- (C)
    50:- ( )

    ReplyDelete
  29. Latest answer key with question paper http://physics43.files.wordpress.com/2012/03/jest-2012-question.pdf

    ReplyDelete
  30. The JEST 2012 Question paper and answer key for the JEST 2012 (e.g P-series) is available for verification.

    If you have any objection on the published answer key, please write to jest12 @physics .iisc. ernet. in with valid arguments before 10.00 am on or before 5th March 2012."

    ReplyDelete
  31. The JEST 2012 Question paper and answer key for the JEST 2012 (e.g P-series) is available for verification.

    If you have any objection on the published answer key, please write to jest12 @physics .iisc. ernet. in with valid arguments before 10.00 am on or before 5th March 2012."

    ReplyDelete
  32. http://physicskerala.blogspot.in/2011/03/jest-2011-results-published-at.html

    ReplyDelete
  33. results are expected to be on 16th of this month
    and the cut off may be 30
    and to get admission one must get a rank below 150

    ReplyDelete

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