ACJC 2024 J2 H2 Physics Prelim P4 Soln

Anglo-Chinese Junior College 2024 H2 Preliminary Exam Paper 4 Guide H2 (9749) Physics JC2 2024 Page 1 of 5 Q1 (a) Value of w (measured to the nearest mm) with unit and in the range 69.0 – 71.0 cm. Value of I1 (measured to the nearest 0.1 mA) with unit. (b) Correct calculation of I1I2 with unit. Value of I2 is smaller than value of I1. (c) Four sets of readings of w, I 1 and I 2 and, the range of w is more than or equal to 30.0 cm Column headings: Each column heading must contain a quantity, a unit and a separating mark where appropriate. The presentation of quantity and unit must conform to accepted scientific convention, e.g. -11 /mw , 42 12 / 10 A−II . Significant figures: All values of 1 w must be given to the same number of s.f. as (or one more than) the number of s.f. in w. All values of 12II must be given to the same number of s.f. as (or one more than) the least number of s.f. in I 1 and I 2. (d)(i) Plotting of points: All observations in the table must be plotted on the grid. Diameter of plotted points must be ⩽ half a small square. Points must be plotted to an accuracy of half a small square in both x and y directions. Line of best fit: There must be an even distribution of points either side of the line along the full length. Allow one anomalous point only if clearly indicated (i.e. circled or labelled). Lines must not be kinked or thicker than half a small square. (d)(ii) Gradient: The hypotenuse of the triangle used must be greater than half the length of the drawn line. Both read-offs must be accurate to half a small square in both the x and y directions. Method of calculation must be correct (not x / y). Gradient sign on answer line matches graph drawn. Value of P = candidate’s gradient Unit for P: A2 m Vertical intercept: Correct read-off from a point on the line and substituted into y = mx + c or an equivalent expression. Read-off accurate to half a small square in both x and y directions. Value of Q = candidate’s intercept Unit for Q: A2 (d)(iii) When 1 0w = , w = . This is not possible to obtain as we only used one metre in length for the wire.

Anglo-Chinese Junior College 2024 H2 Preliminary Exam Paper 4 Guide H2 (9749) Physics JC2 2024 Page 2 of 5 Q2 (a)(i) Zero error recorded. Value of D1 (measured to the nearest 0.002 cm) with repeated readings and in the range 3.500 – 4.500 cm. Correct calculation of C1 with unit. (a)(ii) Justification of the number of significant figures of C1 linked to the number of s.f. in M1 and D1. C1 has the same number