• 9702 November 2010 Paper 12 Worked Solutions | A-Level Physics

Paper 12

1 A                  11 B                21 A                31 A

2 B                  12 C                22 A                32 C

3 A                  13 D                23 C                33 D

4 C                  14 D                24 C                34 B

5 D                  15 D                25 D                35 B

6 D                  16 B                26 C                36 B

7 D                  17 C                27 B                37 B

8 A                  18 C                28 A                38 D

9 C                  19 C                29 A                39 C

10 B                20 D                30 D                40 B

Notes for some specific questions:


3 - Ans: A. {Detailed explanations for this question is available as Solution 795 at Physics 9702 Doubts | Help Page 160 - http://physics-ref.blogspot.com/2015/06/physics-9702-doubts-help-page-160.html}

4 – Ans: C. {Detailed explanations for this question is available as Solution 259 at Physics 9702 Doubts | Help Page 42 - http://physics-ref.blogspot.com/2014/12/physics-9702-doubts-help-page-42.html}

5 – Ans: D. Even with subtraction of data, uncertainty is still added, as arithmetic will show by obtaining highest and lowest possible values for x. So, x = 1.27 – 0.83 = 0.44m. Δx = 0.02 + 0.01 = 0.03m. Percentage uncertainty = (0.03 / 0.44) x 100% = 6.8% = 7%.

7 – Ans: D. {Detailed explanations for this question is available as Solution 125 at Physics 9702 Doubts | Help Page 23 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-23.html}

8 – Ans: A. {Detailed explanations for this question is available as Solution 983 at Physics 9702 Doubts | Help Page 203 - http://physics-ref.blogspot.com/2015/09/physics-9702-doubts-help-page-203.html}

9 – Ans: C. {Detailed explanations for this question is available as Solution 723 at Physics 9702 Doubts | Help Page 146 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-146.html}

11 - Ans: B. {Detailed explanations are available as solution 83 at Physics 9702 Doubts | Help Page 15 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-15.html}

12 - Ans: C. {Detailed explanations for this question is available as Solution 176 at Physics 9702 Doubts | Help Page 29 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-29.html}

13 – Ans: D. {Detailed explanations for this question is available as Solution 785 at Physics 9702 Doubts | Help Page 158 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-158.html}

14 - Ans: D. {Detailed explanations for this question is available as Solution 498 at Physics 9702 Doubts | Help Page 96 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-96.html}


15 - Ans: D. {Explanations are available as solution 69 at Physics 9702 Doubts | Help Page 12 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-12.html}


16 - Ans: B. {Detailed explanations for this question is available as Solution 1115 at Physics 9702 Doubts | Help Page 240 - http://physics-ref.blogspot.com/2016/07/physics-9702-doubts-help-page-240.html}


21 - Ans: A. {Detailed explanations for this question is available as Solution 531 at Physics 9702 Doubts | Help Page 103 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-103.html}

22 – Ans: A.{Detailed explanations for this question is available as Solution 760 at Physics 9702 Doubts | Help Page 153 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-153.html}

25 - Ans: D. {Detailed explanations for this question is available as Solution 132 at Physics 9702 Doubts | Help Page 24 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-24.html}


26 - Ans: C. {Detailed explanations for this question is available as Solution 707 at Physics 9702 Doubts | Help Page 143 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-143.html}



27 - Ans: B. {Detailed explanations for this question is available as Solution 446 at Physics 9702 Doubts | Help Page 85 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-85.html}

28 – Ans: A. Deflection is downwards since electric field is from +ve to –ve and the electron would be attracted to the +ve. Here, with the electric field the horizontal velocity remains unchanged but there will be an increase in speed because of the vertical component of velocity given by the electric force to the electron.

31 – Ans: A. Electrons are in random motion, not stationary.

32 – Ans: C. {Detailed explanations for this question is available as Solution 804 at Physics 9702 Doubts | Help Page 161 - http://physics-ref.blogspot.com/2015/06/physics-9702-doubts-help-page-161.html}

33 - Ans: D. {Detailed explanations for this question is available as Solution 712 at Physics 9702 Doubts | Help Page 144 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-144.html}

34 – Ans: B. {Detailed explanations for this question is available as Solution 104 at Physics 9702 Doubts | Help Page 19 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-19.html}

35 - Ans: B. {Detailed explanations for this question is available as Solution 955 at Physics 9702 Doubts | Help Page 197 - http://physics-ref.blogspot.com/2015/09/physics-9702-doubts-help-page-197.html}

40 – Ans: B. 
A counter recording radioactive decays from a radioactive source gives the following counts in equal intervals of time.

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.