2021 J2 H2 Physics Prelim P4 MS Sharing

Anglo-Chinese Junior College 2021 H2 Preliminary Exam Paper 4 MS H2 (9749) Physics Annotations used in marking BOD - Benefit of doubt ECF - Error carried forward POT - Powers of ten error TE - Transfer error CE - Calculation error XP - Wrong physics ENG - Generally bad english, phrasing and expression PP - Poor presentation of answers Note: For POT and TE, we can award the M mark, not the A mark. Question Q1 (a)(i) Value of L to the nearest mm in the range of 98.5−99.5 cm with unit (b)(i) Measurement of θ to the nearest degree with unit. (b)(ii) Percentage uncertainty in θ based on absolute uncertainty in the range of 2°−5°. Absolute uncertainty to 1 s.f. Correct method of calculation to obtain percentage uncertainty. Percentage uncertainty to 1 or 2 s.f. (c)(i) C calculated correctly with appropriate units. Show working with correct substitution of values. (c)(ii) Plot straight line graph of sin θ against . Gradient = C (d) Value of k correctly calculated and with appropriate units k in the range of 15−30 N m-1 (e) Compare k from (d) together to uncertainty of θ with the actual value of k Correct conclustion based on result [Total: 9 marks] JC2 2021 Page 1 of 8

Anglo-Chinese Junior College 2021 H2 Preliminary Exam Paper 4 MS H2 (9749) Physics Q2 (a)(i) Value of x in the range of 48.0−52.0 cm with unit and correct decimal place. (b) Six sets of readings of x and V Range >= 35 cm Correct column headings Each column heading must contain a quantity, a unit and a separating mark where appropriate Correct decimal place of raw values for x and V. Correct significant figures for the calculated values of and correct calculation of . (c) (Graph) Sensible scales must be used. Awkward scales (e.g. 3:10) are not allowed. Scales must be chosen so that plotted points occupy at least half the graph grid in both the x and y directions. Axes must be labelled with the quantity which is being plotted. (Graph) All observations to be plotted. Work to an accuracy of at least half a small square. (Graph) Line of best fit – even distribution of points on both sides of the line. Anomalous point should be circled and labelled on the graph. (minimum must circle it) Points used to calculate the gradient must be greater than half the length of the drawn line. Read-offs must be accurate to half a small square and indicated on graph. Calculation of gradient must be accurate. y-intercept read off accurately with correct precision, OR, calculated accurately from y = mx + c using one point on the line. Check for sf if calculated (ecf for wrong gradient) Check for dp if read off graph JC2 2021