CAPE Physics Unit 2 · 2004 · Paper 1

40 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)2 marksState Kirchhoff's laws for electrical circuits.
2. 1(a)(ii)2 marksExplain the physical basis for EACH law in 1(a)(i).
3. 1(b)(i)2 marksDetermine the reading when an ideal voltmeter is connected between points A and B in Figure 1.
4. 1(b)(ii)4 marksDetermine the reading when an ideal ammeter is connected between points A and B in Figure 1.
5. 2(a)(i)1 markWrite down an expression for the magnetic field at a distance r metres from a long straight wire carrying a current of I amperes.
6. 2(a)(ii)1 markState the shape formed by the magnetic field lines around a long straight current-carrying wire.
7. 2(a)(iii)4 marksOn Figure 2a, sketch the resultant magnetic field lines due to the interaction of the Earth's magnetic field and that of the wire, and indicate with an X the region where the resultant magnetic field is zero.
8. 2(b)(i)1 markMark with a P the approximate region on Figure 2c where the resultant magnetic field is zero.
9. 2(b)(ii)3 marksCalculate the distance of P from the wire carrying the current of 5 A.
10. 3(a)(i)1 markDefine capacitance.
11. 3(a)(ii)4 marksDerive an expression for the equivalent capacitance of three capacitors C1, C2, and C3 connected in series.
12. 3(b)(i)4 marksDraw the best straight line through the data on Figure 3 and use it to determine the capacitance of the capacitor.
13. 3(b)(ii)1 markCalculate the energy stored in the capacitor when V = 2 volts.
14. 4(a)(i)1 markExplain what is meant by an n-type semiconductor.
15. 4(a)(ii)1 markExplain what is meant by a p-type semiconductor.
16. 4(b)(i)1 markExplain how the circuit in Figure 4 could be modified so that the voltage at X is MAXIMUM when the LDR is in the dark.
17. 4(b)(ii)6 marksCalculate the difference in the resistance of the LDR between the dark and light conditions.
18. 4(b)(iii)1 markGive ONE practical use for the circuit in Figure 4.
19. 5(a)(i)4 marksWith the aid of a labelled diagram, explain the operation of an ideal transformer.
20. 5(a)(ii)1 markWrite down an expression relating Np, Ns, Vp, and Vs for a transformer.
21. 5(b)(i)1 markCalculate the voltage across the secondary windings when the switch is open.
22. 5(b)(ii)4 marksCalculate the currents in the primary and secondary windings when the switch is closed.
23. 6(a)(i)1 markExplain the effect of negative feedback on the gain of an operational amplifier.
24. 6(a)(ii)1 markExplain the effect of negative feedback on the bandwidth of an operational amplifier.
25. 6(b)(i)4 marksDraw an inverting amplifier circuit with input resistance Ri and feedback resistance Rf, and use it to explain what is meant by a virtual ground.
26. 6(b)(ii)1 markCalculate the voltage at point A in Figure 6.
27. 6(b)(iii)2 marksCalculate the output voltage Vo in Figure 6.
28. 6(b)(iv)1 markCalculate the overall gain of the circuit in Figure 6.
29. 7(a)(i)2 marksComplete the table giving the symbol, mass, and charge for alpha particles, beta particles, and gamma rays.
30. 7(a)(ii)3 marksOn Figure 7, sketch and label the paths of the three types of radiation (alpha, beta, gamma) as they travel through the magnetic field directed into the paper.
31. 7(b)5 marksElectrons accelerated through a potential difference of 50 kV strike a target producing X-rays. Calculate the value of the cut-off wavelength λ0.
32. 8(a)(i)2 marksExplain what is meant by the term 'wave-particle duality of matter'.
33. 8(a)(ii)2 marksGive TWO examples to support the concept of wave-particle duality.
34. 8(b)(i)2 marksWrite de-Broglie's equation and explain EACH of the symbols in the equation.
35. 8(b)(ii)4 marksFind the de-Broglie wavelength of electrons with kinetic energy 10 keV.
36. 9(a)(i)1 markExplain what is meant by mass defect.
37. 9(a)(ii)1 markExplain what is meant by the binding energy of a nucleus.
38. 9(a)(iii)2 marksExplain what is meant by an isotope.
39. 9(b)(i)2 marksComplete the nuclear reaction equations for (a) 238_92 U -> 237_91 Pa + ... and (b) 235_92 U + 1_0 n -> 141_55 Cs + 93_37 Rb + ...
40. 9(b)(ii)4 marksUsing the masses 238_92 U = 395.164 x 10^-27 kg, 237_91 Pa = 393.505 x 10^-27 kg, and 1_1 H = 1.673 x 10^-27 kg, show that 238_92 U CANNOT spontaneously emit a proton.