CAPE Physics Unit 2 · 2008 (T&T) · Paper 2
37 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(a)(i)2 marksWith the aid of a diagram explain the meaning of the term 'magnetic flux'.
- 1(a)(ii)1 markHow is the unit of magnetic flux density related to the tesla?
- 1(a)(iii)1 markState Faraday's law of electromagnetic induction.
- 1(b)(i)3 marksCalculate the MAXIMUM value of the TOTAL flux linkage through the 16 turn coil.
- 1(b)(ii)2 marksFind the peak value of the e.m.f. induced in the coil, given that the equation for the variation of the flux linkage is \Phi = \Phi_0 \sin 2\pi f t.
- 1(b)(iii)4 marksShow on Figure 2 (b) the c.r.o. trace expected if the number of turns wrapped around the solenoid was increased to 32, and on Figure 2 (c) show the effect of changing the frequency of the supply to the solenoid to 1000…
- 1(b)(iv)2 marksDescribe briefly how you could show that the induced e.m.f. depends on the area of the coil.
- 2(a)(i)2 marksSuggest a pair of values for the resistors, R_1 and R_2, if the amplifier is to have a gain of +10.
- 2(a)(ii)4 marksState what extra equipment would be needed to obtain data to plot the amplifier's transfer characteristic (graph of V_out vs V_in), and show on Figure 3 how these components would be connected.
- 2(b)(i)5 marksUse the data in Table 1 to plot, on the grid provided, the transfer characteristic for the non-inverting amplifier.
- 2(b)(ii)2 marksFrom your graph determine the gain of the amplifier.
- 2(b)(iii)2 marksState the range of possible input voltages if the amplifier is NOT to be saturated (maximum positive input and maximum negative input).
- 3(a)(i)1 markExplain what is meant by the 'stopping potential'.
- 3(a)(ii)2 marksWith reference to Figure 4, explain how the stopping potential may be measured.
- 3(b)(i)1 markComplete Table 2 by filling in the missing values of 1/\lambda.
- 3(b)(ii)3 marksOn the grid provided, plot a graph of stopping potential, V_s against 1/\lambda.
- 3(b)(iii)a)4 marksUse the graph to determine Planck's constant.
- 3(b)(iii)b)2 marksUse the graph to determine the cut-off wavelength, \lambda_0.
- 3(b)(iii)c)2 marksUse the graph to determine the work function of the metal.
- 4(a)(i)a)2 marksDescribe how values for the graph in Figure 5 could be obtained.
- 4(a)(i)b)2 marksFigure 6 shows a thermistor in a water bath. Copy Figure 6 and complete it by drawing in the required circuit.
- 4(a)(ii)a)3 marksFind the potential at point Q in the bridge circuit of Figure 7.
- 4(a)(ii)b)4 marksAt what thermistor temperature will the galvanometer read zero?
- 4(b)4 marksGiven that current y is 2.0 A and current z is 1.0 A, calculate the e.m.f. of the battery labelled B.
- 5(a)(i)2 marksDraw the truth tables for a NOR gate and a NAND gate.
- 5(a)(ii)3 marksDraw a circuit diagram to show how a NAND gate may be constructed from a number of NOR gates.
- 5(a)(iii)3 marksRedesign the circuit shown in Figure 9 so that it may be constructed using ONLY NOR gates. Reduce the circuit to the MINIMUM chip count.
- 5(b)(i)1 markAdd the binary numbers 1011 and 101.
- 5(b)(ii)2 marksDiscuss the difference between a half-adder and a full-adder in digital electronics.
- 5(b)(iii)4 marksDraw a diagram to show how a full adder is constructed from half-adders and give an example to explain its operation.
- 6(a)(i)2 marksWhat is the evidence in Millikan's oil drop experiment for the quantization of charge?
- 6(a)(ii)2 marksGive TWO measures adopted by Millikan to improve accuracy in the oil drop experiment.
- 6(a)(iii)1 markExplain how it is possible to change the charge on an oil droplet.
- 6(b)(i)2 marksDraw a free body diagram showing the forces acting on the oil drop.
- 6(b)(ii)a)3 marksCalculate the charge on the oil drop.
- 6(b)(ii)b)2 marksCalculate the number of electrons attached to the oil drop.
- 6(c)3 marksThe potential of the upper plate is suddenly changed to -1.50 \times 10^3 V. Determine the initial acceleration of the charged drop.