• 9702 November 2013 Paper 11 & 12 Worked Solutions | A-Level Physics

Paper 11 & Paper 12 are similar

1 B                  11 C                21 A                31 B

2 C                  12 D                22 C                32 C

3 B                  13 A                23 D                33 C

4 B                  14 D                24 A                34 B

5 C                  15 B                25 D                35 B

6 C                  16 B                26 C                36 A

7 C                  17 A                27 A                37 D

8 C                  18 C                28 D                38 C

9 D                  19 B                29 B                39 C

10 B                20 D                30 A                40 A

Notes for some specific questions:

2 – Ans: C. For ans A, Tcos30 is the vertical component of tension T and cannot be equated to the horizontal force H.  B is incorrect since H is horizontal and the correct equation relating T and H would be Tsin30 = H where Tsin30 is the horizontal component of T. Ans C is correct since 2 vertical forces are being equated. As for ans D, W which is vertical is equated to Tsin30, which represents the horizontal component of T. So, it is incorrect.

3 - Ans: B. {Detailed explanations for this question is available as Solution 507 at Physics 9702 Doubts | Help Page 98 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-98.html}


4 - Ans: B. {Detailed explanations for this question is available as Solution 750 at Physics 9702 Doubts | Help Page 151 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-151.html}

5 – Ans: C. if there is a (0.01/5=) 0.2% uncertainty in diameter, then there will be a 0.6% uncertainty in volume

  

6 - Ans: C. {Detailed explanations for this question is available as Solution 558 at Physics 9702 Doubts | Help Page 109 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-109.html}
 


7 - Ans: C. {Detailed explanations for this question is available as Solution 514 at Physics 9702 Doubts | Help Page 100 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-100.html}

8 – Ans: C. {Detailed explanations for this question is available as Solution 484 at Physics 9702 Doubts | Help Page 94 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-94.html}

9 – Ans: D. The question asks what is MEANT by mass and weight of an object. For mass, only “the property that resists its acceleration” tell us what mass means. “Its momentum divided by its velocity” do not tell us what mass means. The same goes for weight. Weight is the pull of the Earth on it.

10 – Ans: B Gravitational force does not alter when the spacecraft is launched

11 - Ans: C. {Detailed explanations for this question is available as Solution 160 at Physics 9702 Doubts | Help Page 27 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-27.html}

12 – Ans: D. When a body is moving through air to the left, there will be a drag force acting on it to the right, as well as its weight.

14 – Ans: D. Increase in force = 2(120cos(55)) – 2(100(cos(65)) = 53N

15 – Ans: B. {Detailed explanations for this question is available as Solution 208 at Physics 9702 Doubts | Help Page 33 - http://physics-ref.blogspot.com/2014/12/physics-9702-doubts-help-page-33.html}

16 – Ans: B. Internal energy of a system is the random energy of the atoms of the system. It is the sum of the potential and kinetic energies due to the random motion of the atoms. Internal energy is a property of the system itself. So, it cannot be “the amount of heat supplied to the system”.

17 – Ans: A. {Explanations are available as solution 51 at Physics 9072 Doubts | Help Page 9 -  http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-9.html }

18 - Ans: C. {Detailed explanations for this question is available as Solution 519 at Physics 9702 Doubts | Help Page 101 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-101.html}


19 - Ans: B. {Detailed explanations for this question is available as Solution 130 at Physics 9702 Doubts | Help Page 24 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-24.html}


22 - Ans: C. {Detailed explanations for this question is available as Solution 539 at Physics 9702 Doubts | Help Page 105 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-105.html}


23 –  Ans: D. modeling clay cannot possible be elastic or brittle.

24 - Ans: A. {Detailed explanations for this question is available as Solution 799 at Physics 9702 Doubts | Help Page 160 - http://physics-ref.blogspot.com/2015/06/physics-9702-doubts-help-page-160.html}


25 - Ans: D. {Detailed explanations for this question is available as Solution 496 at Physics 9702 Doubts | Help Page 96 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-96.html}

27 - Ans: A. {Detailed explanations for this question is available as Solution 169 at Physics 9702 Doubts | Help Page 28 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-28.html}

28 – Ans: D. {Detailed explanations for this question is available as Solution 768 at Physics 9702 Doubts | Help Page 155 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-155.html}

30 - Ans: A. {Detailed explanations for this question is available as Solution 140 at Physics 9702 Doubts | Help Page 25 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-25.html}


31 - Ans: B. {Detailed explanations for this question is available as Solution 744 at Physics 9702 Doubts | Help Page 150 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-150.html}


32 - Ans: C. {Detailed explanations for this question is available as Solution 732 at Physics 9702 Doubts | Help Page 148 - http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-148.html}


33 - Ans: C.
The diagram shows an electric circuit in which the resistance of the external resistor is 2R and the internal resistance of the source is R.

34 – Ans: B. D is an obvious reaction but when current is worked out for the 2 lamps it is found to be the same for both. Lamp 1: 240V, 60W. I=60/240=0.25A. Lamp 2: 10V, 2.5W. I=2.5/10=0.25A

35 - Ans: B. {Detailed explanations for this question is available as Solution 937 at Physics 9702 Doubts | Help Page 193 - http://physics-ref.blogspot.com/2015/09/physics-9702-doubts-help-page-193.html}

36 – Ans: A.{Detailed explanations for this question is available as Solution 120 at Physics 9702 Doubts | Help Page 22 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-22.html}

37 – Ans: D. {Detailed explanations for this question is available as Solution 452 at Physics 9702 Doubts | Help Page 87 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-87.html}

38 - Ans: C. {Detailed explanations for this question is available as Solution 455 at Physics 9702 Doubts | Help Page 88 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-88.html}


39 - Ans: C. {Detailed explanations for this question is available as Solution 814 at Physics 9702 Doubts | Help Page 163 - http://physics-ref.blogspot.com/2015/06/physics-9702-doubts-help-page-163.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.