Prelim H2P4 MS

1 2021 JC2 Prelim Paper 4 Question 1 MS Q1 Answer Mark Code (b) Measurement of I, V and θ Values of I, V and θ measured to the correct unit within appropriate range. 1 M1 (c) Set up apparatus from a circuit diagram and follow of written instructions  Award 2 marks if the student has successfully collected 6 or more sets of data (I, V and θ), without assistance/intervention.  Award 1 mark if student has successfully collected 5 sets of data ( I, V and θ), without assistance/intervention.  Award zero mark if student has successfully collected 4 or fewer sets of data (I, V and θ), without assistance/intervention.  Deduct 1 mark if student requires some assistance/intervention but has been able to do most of the work independently. Indicate the nature of any assistance.  Deduct 2 marks if student has been unable to collect data without substantial assistance/intervention. Minimum mark for M2 = 0. 2 M2 (c) Layout: Column headings (raw data & calculated quantities: I, V, θ, T, R, ln R, 1/T) Each column heading must contain an appropriate quantity and a unit. Ignore units in the body of the table. There must be some distinguishing mark between the quantity and the unit i.e. solidus is expected. 1 P1 (c) Table of results: raw data (appropriate degree of precision) All values of I, V, θ to the correct precision. 1 P2 (c) Table of results: calculated quantities (appropriate no. of significant figures) For each calculated value of T, R, ln R and 1/T, the number of s.f. should be the same (or one more) as the number of s.f. in the raw data. 1 P3 (c) Table of results: calculated quantities Correctly calculated values of calculated quantities. Allow one slip computation. 1 A1 (d) Linearising Equation Linearising equation and deriving expressions that equate gradient to E/k and y-intercept to ln A. 1 A2 (d) Graph: Layout, choice of scale and labeling of axes Sensible scales must be used. Awkward scales (e.g. 3:10) are not allowed. Scales must be chosen so that the plotted points occupy at least half the graph grid in both x and y directions. Axes must be labelled with the quantity which is being plotted. 1 P4 (d) Graph: plotting of points All observations must be plotted. Check any 3 points and put ticks if correct. Work to an accuracy of half a small square. 1 P5 (d) Graph: trend line and ability to draw best fit line 9749/04/ASRJC/2019MYCT [Turn Over

2 Q1 Answer Mark Code Straight line of best fit – judge by scatter of points about the candidate’s line. There must be a fair scatter of points either side of the line. 1 P6 (d) Interpretation of graph – gradient Gradient – the hypotenuse of the Δ must be greater than half the length of the drawn line. Read-offs must be accurate to half a small square. 1 A3 (d) Interpretation of graph – intercept y-intercept must be read off to the nearest half small square or determined from y = mx + c using a point on the line. 1 A4 (d) Interpretation of graph – values of E and A Values