• 9702 November 2009 Paper 11 Worked Solutions | A-Level Physics

Paper 11

1 C                  11 C                21 C                31 C

2 A                  12 B                22 B                32 D

3 B                  13 D                23 B                33 A

4 A                  14 A                24 B                34 A

5 A                  15 D                25 D                35 B

6 B                  16 C                26 D                36 C

7 C                  17 C                27 D                37 C

8 D                  18 D                28 B                38 D

9 A                  19 B                29 A                39 C

10 C                20 D                30 C                40 B

Notes for some specific questions:

5 – Ans: A. {Detailed explanations for this question is available as Solution 221 at Physics 9702 Doubts | Help Page 36 - http://physics-ref.blogspot.com/2014/12/physics-9702-doubts-help-page-36.html}

7 - Ans: C. {Detailed explanations for this question is available as Solution 969 at Physics 9702 Doubts | Help Page 200 - http://physics-ref.blogspot.com/2015/09/physics-9702-doubts-help-page-200.html}


8 - Ans: D. {Detailed explanations for this question is available as Solution 945 at Physics 9702 Doubts | Help Page 195 - http://physics-ref.blogspot.com/2015/09/physics-9702-doubts-help-page-195.html}

9 – Ans: A. {Detailed explanations for this question is available as Solution 138 at Physics 9702 Doubts | Help Page 25 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-25.html}

10 - Ans: C. {Detailed explanations for this question is available as Solution 98 at Physics 9702 Doubts | Help Page 18 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-18.html}


12 - Ans: B. {Detailed explanations for this question is available as Solution 152 at Physics 9702 Doubts | Help Page 26 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-26.html}

13 – Ans: D. {Detailed explanations for this question is available as Solution 127 at Physics 9702 Doubts | Help Page 23 - http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-23.html}

14 – Ans: A. Let initial velocity = v. At highest point, projectile only has a horizontal component of velocity which is vcos(45).  Vertical component of velocity is zero. Kinetic energy is proportional to v². So, at highest point, kinetic energy proportional to [vcos(45)]² = 0.5v². So, KE is halved.

15 – Ans: D. Sum of momentum before collision = sum of momentum after collision. Before collision, momentum is zero since trolleys are stationary. So, after collision, 2kg(2ms^-1) + 1kg(v) = 0. So, v = -4ms^-1 = 4ms^-1 (considering magnitude only). So, energy stored = sum of kinetic energies of trolleys = ½ (2)(2)² + ½ (1)(4)² = 12J 

16 - Ans: C. {Detailed explanations for this question is available as Solution 949 at Physics 9702 Doubts | Help Page 196 - http://physics-ref.blogspot.com/2015/09/physics-9702-doubts-help-page-196.html}

17 – Ans: C. {Detailed explanations for this question is available as Solution 979 at Physics 9702 Doubts | Help Page 202 - http://physics-ref.blogspot.com/2015/09/physics-9702-doubts-help-page-202.html}

19 - Ans: B. {Detailed explanations for this question is available as Solution 1071 at Physics 9702 Doubts | Help Page 225 - http://physics-ref.blogspot.com/2015/11/physics-9702-doubts-help-page-225.html}


20 - Ans: D.
Which row best defines elastic and plastic behaviour of a material?

21 – Ans: C. For linear force-extension curve, strain energy = ½ Fx = ½ (100)(2x10^-3) = 0.1J. But shape of graph implies an answer 10% greater than this straight line graph value. So, ans = 0.11J. 0.2J is too big.

22 - Ans: B. {Detailed explanations for this question is available as Solution 796 at Physics 9702 Doubts | Help Page 160 - http://physics-ref.blogspot.com/2015/06/physics-9702-doubts-help-page-160.html}

23 – Ans: B. {Detailed explanations for this question is available as Solution 638 at Physics 9702 Doubts | Help Page 126 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-126.html}

25 - Ans: D. {Detailed explanations for this question is available as Solution 393 at Physics 9702 Doubts | Help Page 73 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-73.html}

26 – Ans: D. dsinθ_n = nλ. Diffraction grating has 300lines/mm. So, d = 1x10^-3 / 300 = 3x10^-6 m. Consider the largest angle possible: θ_n = 90^o. sinθ_n = 1. Total number of transmitted maxima on 1 side, n = d / λ = (3x10^-6) / (450x10^-9) = 7.4074 = 7 since n is an integer. So, considering the other side in additional to the central maxima, total number of transmitted maxima = 7 + 7 + 1 =15.

27 - Ans: D. {Detailed explanations for this question is available as Solution 596 at Physics 9702 Doubts | Help Page 117 - http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-117.html}



28 - Ans: B. {Detailed explanations for this question is available as Solution 399 at Physics 9702 Doubts | Help Page 74 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-74.html}


29 - Ans: A. {Detailed explanations for this question is available as Solution 403 at Physics 9702 Doubts | Help Page 75 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-75.html}


30 - Ans: C. {Detailed explanations for this question is available as Solution 407 at Physics 9702 Doubts | Help Page 76 - http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-76.html}



33 - Ans: A. {Detailed explanations for this question is available as Solution 1111 at Physics 9702 Doubts | Help Page 238 - http://physics-ref.blogspot.com/2016/05/physics-9702-doubts-help-page-238.html}

40 – Ans: B. More deflection occurs for the alpha-particle which is closer to the gold atom.

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.