CAPE Physics Unit 2 · 2002 · Paper 1

54 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.

1. 1(a)(i)1 markDefine the term electromotive force.
2. 1(a)(ii)1 markDefine the term volt.
3. 1(b)3 marksDraw a circuit diagram that could be used to take measurements to obtain the characteristic shown in Figure 1.
4. 1(c)(i)1 markCalculate the current flowing through the 200 Ω resistor.
5. 1(c)(ii)2 marksDetermine the potential difference across the thermistor.
6. 1(c)(iii)2 marksCalculate the resistance of resistor R.
7. 2(a)1 markDefine the 'Farad'.
8. 2(b)(i)1 markWrite down a formula for the equivalent capacitance of three capacitors connected in parallel.
9. 2(b)(ii)1 markWrite down a formula for the equivalent capacitance of three capacitors connected in series.
10. 2(c)2 marksShow that the energy stored, W, in a parallel plate capacitor of capacitance C with a voltage V across its plates is given by W = 1/2 C V^2.
11. 2(d)(i)1 markCalculate the initial charge on the 3 μF capacitor.
12. 2(d)(ii)1 markCalculate the initial charge on the 1 μF capacitor.
13. 2(d)(iii)2 marksCalculate the final p.d. across the 3 μF capacitor.
14. 2(d)(iv)1 markCalculate the total energy stored in the capacitors when they are connected together.
15. 3(a)1 markState Coulomb's law for electrostatic charges.
16. 3(b)(i)1 markExplain what is meant by electric field strength.
17. 3(b)(ii)1 markExplain what is meant by electric potential.
18. 3(c)1 markState how electric field strength and electric potential are related.
19. 3(d)(i)5 marksCalculate the electric field strength at the midpoint between the two charges.
20. 3(d)(ii)1 markIndicate on Figure 3, along the line joining the two point charges, the approximate position where the net electric field is zero.
21. 4(a)5 marksDetermine the gain of the amplifier.
22. 4(b)(i)1 markWrite down the name of the operational amplifier circuit shown in Figure 5.
23. 4(b)(ii)2 marksState TWO practical uses of the circuit shown in Figure 5.
24. 4(c)2 marksState how the values of V_o1 and V_o2 relate to V_1.
25. 5(a)(i)1 markWhat type of semiconductor is produced by doping an intrinsic semiconductor with donor atoms?
26. 5(a)(ii)1 markWhat are the majority charge carriers in a p-type semiconductor?
27. 5(a)(iii)2 marksExplain the origin of the diffusion current in a semiconductor.
28. 5(b)(i)1 markExplain what is meant by the 'depletion layer of a pn-junction'.
29. 5(b)(ii)2 marksExplain how the depletion layer is formed.
30. 5(b)(iii)1 markDraw one arrow on Figure 7 to show the direction of the diffusion current.
31. 5(b)(iv)1 markOn Figure 7, use the symbol for a cell to complete a circuit showing how the pn-junction is connected in the forward bias connection.
32. 5(b)(v)1 markExplain why the forward bias circuit completed in (b)(iv) allows an appreciable current to flow.
33. 6(a)1 markState what is understood by a 'logic gate'.
34. 6(b)(i)2 marksWrite down the truth table for the circuit.
35. 6(b)(ii)1 markDraw the single logic gate which produces the output specified in (b)(i).
36. 6(b)(iii)1 markGive the name of the logic gate drawn in part (b)(ii).
37. 6(c)(i)4 marksCalculate the y-plate sensitivity of the c.r.o.
38. 6(c)(ii)1 markExplain how the waveform shown in Figure 9 could be 'smoothed'.
39. 7(a)(i)1 markWrite an equation relating the energy E associated with a photon to its wavelength λ.
40. 7(a)(ii)1 markWrite an equation relating Einstein's mass-energy relationship.
41. 7(a)(iii)2 marksHence, derive the de Broglie equation which suggests the wave-particle nature of light.
42. 7(b)(i)4 marksCalculate its de Broglie wavelength.
43. 7(b)(ii)2 marksAn oscillating molecule de-excites from one allowed energy level to the next lower one, changing energy by 2.2 eV. Calculate the frequency of the emitted radiation.
44. 8(a)(i)1 markState the name given to the effect of using electromagnetic radiation to cause electrons to be emitted from a metal surface.
45. 8(a)(ii)5 marksExplain how the photoelectric effect provided evidence for the particle nature of electromagnetic radiation.
46. 8(b)(i)1 markDetermine the threshold frequency from the graph.
47. 8(b)(ii)1 markDetermine the work function from the graph.
48. 8(b)(iii)2 marksDetermine Planck's constant from the graph.
49. 9(a)(i)2 marksExplain what is meant by activity of a radioactive source, and state its corresponding unit.
50. 9(a)(ii)2 marksExplain what is meant by decay constant, and state its corresponding unit.
51. 9(a)(iii)2 marksExplain what is meant by half life, and state its corresponding unit.
52. 9(b)(i)1 markUse the graph in Figure 11 to determine the background count rate.
53. 9(b)(ii)1 markUse the graph in Figure 11 to determine the half life of the substance.
54. 9(b)(iii)2 marksUse the graph in Figure 11 to determine the decay constant.