RVHS_H2_Physics_P4_QP

River Valley High School Page 1 of 20 H2 Physics 9749 JC2 Preliminary Examinations 2022 RIVER VALLEY HIGH SCHOOL JC2 PRELIMINARY EXAMINATIONS H2 PHYSICS 9749 PAPER 4 23 AUG 2022 2 HRS 30 MIN CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER CLASS 2 1 J INSTRUCTIONS TO CANDIDATES DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. Read these notes carefully. Write your name, class and index number above. Candidates answer on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Give details of the practical shift and laboratory where appropriate in the boxes provided. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. SHIFT LABORATORY FOR EXAMINERS’ USE 1 / 10 2 / 11 3 / 22 4 / 12 TOTAL / 55 This document consists of 19 printed pages and 1 blank page.

River Valley High School Page 2 of 20 H2 Physics 9749 JC2 Preliminary Examinations 2022 1 This experiment is investigating the current in a circuit. Set up the circuit as shown in Fig. 1.1. The resistor r is used to model the effect of internal resistance in the two batteries. E is the sum of the electromotive force (e.m.f.) of the two batteries. Fig. 1.1 Resistors, each of resistance R, are connected in parallel between P and Q. The current I is measured. The experiment is repeated for different numbers n of resistors between P and Q. It is suggested that I and n are related by the equation REr n =+  I E

River Valley High School Page 3 of 20 H2 Physics 9749 JC2 Preliminary Examinations 2022 (a) (i) Measure the current I for n = 2 and n = 3. Record your measurements in Fig. 1.2. n I / mA 1 n 11 /A − I 2 3 4 70.4 5 81.6 6 87.2 7 95.6 Fig. 1.2 [1] (ii) The values of current for n = 4 to n = 7 are given in Fig. 1.2. Calculate and record the values of 1 n and 11 /A − I in Fig. 1.2. [1] (iii) The absolute uncertainty of the measurement of I can be taken to be ± 2 mA. For your values of I when n = 3, determine the percentage uncertainty of 1 I . percentage uncertainty = ………………………… [2]

River Valley High School Page 4 of 20 H2 Physics 9749 JC2 Preliminary Examinations 2022 (b) When 1 I is plotted against 1 n , determine expressions for the gradient and the y-intercept. gradient = ………………………… y-intercept = ………………………… [1]

River Valley High School Page 5 of 20 H2 Physics 9749 JC2 Preliminary Examinations 2022 (c) (i) Plot a graph of 1 I on