Wednesday, August 20, 2014

9702 November 2011 Paper 12 Worked Solutions | A-Level Physics

  • 9702 November 2011 Paper 12 Worked Solutions | A-Level Physics

Paper 12



1 C                  11 A                21 C                31 A
2 D                  12 D                22 A                32 C
3 D                  13 D                23 B                33 D
4 D                  14 B                24 D                34 A
5 B                  15 B                25 B                35 A
6 C                  16 B                26 B                36 C
7 B                  17 A                27 B                37 B
8 D                  18 D                28 A                38 A
9 D                  19 A                29 D                39 C
10 B                20 A                30 A                40 C



Notes for some specific questions:


1 – Ans: C. eV is a unit of energy. 


2 - Ans: D. {Detailed explanations for this question is available as Solution 861 at Physics 9702 Doubts | Help Page 172 - http://physics-ref.blogspot.com/2015/06/physics-9702-doubts-help-page-172.html}



4 - Ans: D. {Detailed explanations for this question is available as Solution 516 at Physics 9702 Doubts | Help Page 100 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-100.html}


5 - Ans: B. {Detailed explanations for this question is available as Solution 666 at Physics 9702 Doubts | Help Page 133 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-133.html}



7 - Ans: B. {Detailed explanations for this question is available as Solution 1129 at Physics 9702 Doubts | Help Page 244 - http://physics-ref.blogspot.com/2016/11/physics-9702-doubts-help-page-244.html}



9 – Ans: D. Without knowing the mass of the ball, its acceleration cannot be determined.   




10 – Ans: B. {Detailed explanations for this question is available as solution 57 at Physics 9702 Doubts | Help page 10 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-10.html}


11 - Ans: A. {Detailed explanations for this question is available as Solution 572 at Physics 9702 Doubts | Help Page 112 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-112.html}




12 – Ans: D. Subtraction of vectors always requires care to be taken. Q is being subtracted, so the opposite direction should be taken and inserted close to the head of P. The resultant vector starts from the tail of P and ends at the head of the Q (which is drawn in the opposite direction). (It often produces surprising results, as with acceleration of body travelling in circular path.)


13 - Ans: D. {Detailed explanations for this question is available as Solution 620 at Physics 9702 Doubts | Help Page 122 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-122.html}




14 - Ans: B. {Detailed explanations for this question is available as solution 84 at Physics 9702 Doubts | Help page 15 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-15.html}




15 – Ans: B. {Detailed explanations for this question is available as Solution 891 at Physics 9702 Doubts | Help Page 181 - http://physics-ref.blogspot.com/2015/07/physics-9702-doubts-help-page-181.html}


16 - Ans: B. {Detailed explanations for this question is available as Solution 521 at Physics 9702 Doubts | Help Page 101 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-101.html}


17 - Ans: A. {Detailed explanations for this question is available as Solution 479 at Physics 9702 Doubts | Help Page 93 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-93.html}


20 - Ans: A. {Detailed explanations for this question is available as Solution 495 at Physics 9702 Doubts | Help Page 96 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-96.html}


21 - Ans: C. {Detailed explanations for this question is available as Solution 1032 at Physics 9702 Doubts | Help Page 216 - http://physics-ref.blogspot.com/2015/10/physics-9702-doubts-help-page-216.html}



22 - Ans: A. {Detailed explanations for this question is available as Solution 610 at Physics 9702 Doubts | Help Page 120 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-120.html}



23 - Ans: B. {Detailed explanations for this question is available as Solution 301 at Physics 9702 Doubts | Help Page 51 - http://physics-ref.blogspot.com/2015/01/physics-9702-doubts-help-page-51.html}


26 - Ans: B. {Detailed explanations for this question is available as Solution 124 at Physics 9702 Doubts | Help Page 23 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-23.html}




28 – Ans: A. {Detailed explanations for this question is available as Solution 1053 at Physics 9702 Doubts | Help Page 221 - http://physics-ref.blogspot.com/2015/11/physics-9702-doubts-help-page-221.html}



29 – Ans: D. Electric Field strength, E = V / d = 9 / (4x10-3) = 2250 = 2.3x103NC-1.



31 – Ans: A. {Detailed explanations for this question is available as Solution 135 at Physics 9702 Doubts | Help Page 24 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-24.html}


33 - Ans: D. {Detailed explanations for this question is available as Solution 107 at Physics 9702 Doubts | Help Page 20 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-20.html}



34 - Ans: A. {Detailed explanations for this question is available as Solution 564 at Physics 9702 Doubts | Help Page 110 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-110.html}

35 - Ans: A. {Detailed explanations for this question is available as Solution 493 at Physics 9702 Doubts | Help Page 95 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-95.html}


37 - Ans: B. {Detailed explanations for this question is available as Solution 113 at Physics 9702 Doubts | Help Page 21 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-21.html}


38 - Ans: A. {Detailed explanations for this question is available as Solution 117 at Physics 9702 Doubts | Help Page 22 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-22.html}




Explanations have been provided for questions that were found to be more difficult. If you are having other doubts that have not been explained here, you may ask your questions through comments. 

74 comments:

  1. Replies
    1. 14 – Ans: B.
      Clockwise moment = anticlockwise moment at X. Trailer causes a force at point X. However, the opposite force exerted by the cab is on the whole trailer which is 20m long. … Consider moment about point of contact (i.e, back wheel). So, F x 20m = 30kN x 10m. F = 15kN.

      Delete
  2. Replies
    1. 26 – Ans: B.
      at t = 18s, phase difference = 180o. Phase diff of 360o corresponds to a cycle. For 1/8 of cycle, phase diff = 360/8 = 45o. Phase diff of 180o is at t = 18s. So, phase diff of 45o is at t = (18/180)x45 = 4.5s.

      Delete
  3. 35 - Ans: A. internal resistance, r = 2Ω. Load resistor, R varies from 0.5 Ω to 4 Ω. V = I^2 V. P = I^2 R. V = I(R+r). So, I = V/(R+r). P = [V/(R+r)]^2 R. Consider (r,P). (0.5,11.52), (1,16), (2,18), (3,17.28), (4,16)

    21 – Ans: C. 1 incorrect since extension of Q is twice that of P for same stress.

    ReplyDelete
  4. Replies
    1. 29 – Ans: D. E = V / d = 9 / (4x10^-3) = 2250 = 2.3x10^3 NC^-1.

      Delete
  5. Question 21 and 23? Need explanation please thank you

    ReplyDelete
  6. 21 – Ans: C. 1 incorrect since extension of Q is twice that of P for same stress.

    23 – Ans: B. Elastic energy = area under graph.

    ReplyDelete
  7. Replies
    1. some details have been added. It is just vector subtraction

      Delete
  8. Question 31 why the answer couldn't be C instead of A? Thank you :)

    ReplyDelete
  9. can I please get the explanation of q32 in paper 11/w11?

    ReplyDelete
    Replies
    1. check question 432 at
      http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-82.html

      Delete
  10. in q6 in paper 11/w12 why is the answer C and not B?the % uncertainty decreases with an increase in the value of the quantity to be measured, right?

    ReplyDelete
  11. sorry, it's q6 in w12 paper 11, should not the answer be B as actual uncertainty is a constant value unless the measuring device is changed and % uncertainty decreases with an increase in the value of the measured quantity, right?

    ReplyDelete
    Replies
    1. it's explained as question 433 at
      http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-82.html

      Delete
  12. Q17 pleease!!!!!

    ReplyDelete
  13. Replies
    1. Question 20 has also been explained

      Delete
  14. Replies
    1. Could you specify clearly which year and which variant? I can't figure which it is.

      Delete
  15. Q13 Nov 2011 V 13 please

    ReplyDelete
    Replies
    1. See solution 573 at
      http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-113.html

      Delete
  16. explain question 22 as well please

    ReplyDelete
  17. Would really appreciate some answers for the November 2011, Paper 11. Specifically, questions 4,8,10,16,20,23,24,26,30,33,34,36,37. I would be extremely grateful if you could help me. Keep up the good work though!

    ReplyDelete
    Replies
    1. For Q37 see solution 763 at
      http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-154.html

      For Q30 see solution 480 at
      http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-93.html


      The others may be added later

      Delete
    2. For Q4, check solution 7 at
      http://physics-ref.blogspot.com/2014/10/physics-9702-doubts-help-page-1.html

      For Q5, check solution 771 at
      http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-155.html

      Delete
  18. Q 37 MJ 2011 V11 please

    ReplyDelete
    Replies
    1. Check solution 765 at
      http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-154.html

      Delete
  19. Q15 November 2012/11 and Q34 November 2014/13 please

    ReplyDelete
    Replies
    1. For Q15 November 2012/11, see solution 775 at
      http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-156.html

      For Q34 November 2014/13, go to
      http://physics-ref.blogspot.com/2015/04/9702-november-2014-paper-13-worked.html

      Delete
  20. Can someone please put Question 26 of October November 2011 Paper 11 ?

    ReplyDelete
    Replies
    1. See solution 866 at
      http://physics-ref.blogspot.com/2015/06/physics-9702-doubts-help-page-173.html

      Delete
  21. NOV 12 paper 13 QS 33

    ReplyDelete
    Replies
    1. Check solution 830 at
      http://physics-ref.blogspot.com/2015/06/physics-9702-doubts-help-page-166.html

      Delete
    2. God bless you

      Delete
  22. s11/paper 12 question 9 explaination plz ASAP

    ReplyDelete
    Replies
    1. Go to
      http://physics-ref.blogspot.com/2014/09/9702-june-2011-paper-12-worked.html

      Delete
  23. 9702/11/o/n/11 Q: 6, 20, 32 plzzz

    ReplyDelete
    Replies
    1. For Q6, see solution 538 at
      http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-105.html

      For Q32, see solution 432 at
      http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-82.html

      Delete
  24. Replies
    1. Check solution 909 at
      http://physics-ref.blogspot.com/2015/08/physics-9702-doubts-help-page-186.html

      Delete
  25. Q23,29,33 from 9702/11/O/N/11 please. Thanks!

    ReplyDelete
    Replies
    1. For Q23, see solution 297 at
      http://physics-ref.blogspot.com/2015/01/physics-9702-doubts-help-page-50.html

      For Q29, Ans: A. Both pipes will give a stationary wave. This is basic knowledge

      Delete
  26. Q18 frm 9702/11/O/N/11 ... thanks...

    ReplyDelete
    Replies
    1. See solution 1028 at
      http://physics-ref.blogspot.com/2015/10/physics-9702-doubts-help-page-215.html

      Delete
  27. q28 why is C wrong? thanks

    ReplyDelete
  28. Question 34 please...thanks in advance.

    ReplyDelete
  29. 9702 papet 22 oct/nov 2011 Q5
    Explanation. ?

    ReplyDelete
    Replies
    1. Go to
      http://physics-ref.blogspot.com/2014/08/9702-november-2011-paper-22-worked.html

      Delete

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