CAPE Physics Unit 2 · 2015 · Paper 2

30 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)2 marksDistinguish between the 'electrical resistance' and the 'electrical resistivity' of the coil of wire.
2. 1(b)1 markIdentify the circuit shown in Figure 2.
3. 1(c)4 marksBy treating the circuit in Figure 2 as two potential dividers in parallel, show that the voltage, V_{AB}, indicated by the multimeter (MM) will be given by: V_{AB} = \left( \frac{R_2}{R_1 + R_2} - \frac{R_x}{R_x +…
4. 1(d)(i)4 marksOn the grid provided in Figure 3, plot a graph of V_{AB} against L and draw your best straight line through the points.
5. 1(d)(ii)4 marksIt can be shown that the equation in Part (c) can be approximated to V_{AB} = 4 - K\rho L, where K = 1.27 \times 10^5\text{ m}^{-2}\text{V }\Omega^{-1} and \rho is the resistivity of the coil wire. Use this…
6. 2(a)(i)3 marksDraw the circuit diagram for an inverting amplifier using an operational amplifier. Label EACH resistor in your circuit with the conventional term used to describe it.
7. 2(a)(ii)3 marksState THREE properties of an ideal operational amplifier.
8. 2(b)(i)4 marksOn the grid provided in Figure 4, plot a graph of output voltage (V_o) vs input voltage (V_i).
9. 2(b)(ii)2 marksUse your graph to calculate the gain of the amplifier.
10. 2(b)(iii)3 marksExplain the shape of your graph.
11. 3(a)4 marksComplete Table 3 to indicate TWO properties and TWO reasons why a radioisotope such as technetium-99m can be used in this way.
12. 3(b)(i)2 marksComplete Table 4 by calculating and inserting appropriate values in the relevant columns for A/A_0 and \ln(A/A_0).
13. 3(b)(ii)4 marksOn the grid provided in Figure 5, plot a graph of \ln(A/A_0) against time, t (in hours), and draw the best straight line through the points.
14. 3(b)(iii)3 marksUse your graph to find the decay constant of technetium-99m.
15. 3(b)(iv)2 marksUse the decay constant to calculate the half-life, t_{1/2}, of technetium-99m.
16. 4(a)3 marksBy using the formula F = BIL\sin\theta, define FULLY the unit of magnetic flux density, the tesla.
17. 4(b)(i)2 marksCalculate the current drawn from the source.
18. 4(b)(ii)3 marksRedraw Figure 7 and add to your drawing a rough sketch of the magnetic field of the current in Conductor A. Indicate by an arrow on the diagram, the direction of the force experienced by Conductor B due to the magnetic…
19. 4(c)(i)2 marksCalculate the value of the magnetic field at B due to the current in A.
20. 4(c)(ii)2 marksDetermine the magnitude and direction of the force experienced by EACH centimetre of Wire B due to the magnetic field of the current in Wire A.
21. 4(d)3 marksThe calculations carried out in (c)(i) and (c)(ii) ignore the effect of the insulating plastic sheath in which the copper conductors are encased. Deduce the effect that the plastic sheath would have on the magnetic…
22. 5(a)2 marksDraw the truth table for a 2-input NAND gate.
23. 5(b)4 marksComplete Table 5 for the circuit shown in Figure 8 and hence show that this circuit is equivalent to a NAND gate.
24. 5(c)4 marksDraw the NAND gate version of an S-R flip-flop taking care to label all inputs and outputs.
25. 5(d)5 marksThe signals S and R shown in Figure 9 are simultaneously applied to the corresponding inputs of an S-R flip-flop. Determine and draw on Figure 9, the Q-output (indicates that the flip-flop is set) of the flip-flop for…
26. 6(a)2 marksState TWO conclusions regarding the nature of atomic structure that were deduced from the results of the Geiger–Marsden experiment.
27. 6(b)(i)3 marksDistinguish between the terms 'mass defect' and 'binding energy'.
28. 6(b)(ii)3 marksSketch a graph to show the relationship between binding energy per nucleon and nucleon number.
29. 6(c)(i)4 marksCalculate the mass defect in kilograms.
30. 6(c)(ii)3 marksHence, calculate the energy in MeV which would be released in this reaction.