EJC 2023 J1 H2 Promo P4 QP

©EJC 2023 9749/04/J1H2PROMO/2023 [Turn over EUNOIA JUNIOR COLLEGE JC1 PROMOTIONAL EXAMINATIONS 2023 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 3 - REGISTRATION NUMBER PHYSICS Paper 4 Practical 9749/04 15th September 2023 1 hour 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number in the spaces at the top of this page. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Answer all questions. Write your answers in the spaces provided 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. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 11 printed pages and 1 blank page. Shift Laboratory For Examiner’s Use 1 14 2 19 Total 33

2 ©EJC 2023 9749/04/J1H2PROMO/2023 1 In this experiment, you will investigate the behaviour of a system in static equilibrium. (a) (i) Determine the mass of one paper clip. mass of one paper clip = ................................ [2] (ii) You are provided with two strings. Connect two mass hangers with the shorter string and place them on both sides of a pulley. The mass hangers should balance each other’s weight and hang in equilibrium. Add paper clips, one by one, to one side as shown in Fig. 1.1 until the pulley starts to rotate. Record the minimum number of paper clips that is required to cause the pulley to rotate. number of paper clips = ........................[1] paper clips mass hangers string pulley retort stand loop Fig 1.1 clamp bench

3 ©EJC 2023 9749/04/J1H2PROMO/2023 [Turn over (b) Using the longer string, set up the apparatus as shown in Fig. 1.2. Mass m and M are provided by a 50 g mass hanger and a pendulum bob, respectively. Fig 1.2 (i) Adjust the position of m along the string until the angle θ is symmetrical about the vertical axis. Measure and record θ. θ = ................................ [1] (ii) Estimate the percentage uncertainty in your value of θ. percentage uncertainty in θ = ................................ [1] bench stand pulley m M string θ

4 ©EJC 2023 9749/04/J1H2PROMO/2023 (c) M, m and θ are related by the expression 2 cos 2Mm θ = . (i) Calculate the value of M. M = ................................ [1] (ii) Using your values in (a)(ii) and (b)(ii), estimate the maximum value of M. maximum M = …………………………. [1] (iii) Repeat (b)(i) for m = 100 g. θ = ................................ [1]

5 ©EJC 2023 9749/04/J1H2PROMO/2023 [Turn over (d) It is suggested that 2 (1 cos )mk θ= + where k is a constant. (i) Use your values from (b)(i) and (c)(iii) to determine two values of k. first value of k = …………………………….…………. second value of k = …………………………….…………. [2] (ii) State whether the results of your experiment support the suggested relationship. Justify your conclusion by referring to your value in (b)(ii). ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... .................................................................................................................................... [2]

6 ©EJC 2023 9749/04/J1H2PROMO/2023 (e) (i) Suggest a significant source of error in the measurement of θ. …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ………………………………………………………………………………………………. [1] (ii) Suggest an improvement that could be made to address the error identified in (e)(i). You may suggest the use of other apparatus or a different procedure. …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ………………………………………………………………………………………………. [1] [Total: 14 Marks]

7 ©EJC 2023 9749/04/J1H2PROMO/2023 [Turn over BLANK PAGE

8 ©EJC 2023 9749/04/J1H2PROMO/2023 2 In this experiment, you will investigate how the period of oscillation of a bent metal wire varies with the angle between the straight parts of the wire (a) (i) Make a sharp bend at the centre of the wire so that the angle θ between the straight parts of the wire is about 140° as shown in Fig. 2.1. Fig 2.1 (ii) Measure and record θ. θ = ................................ [1] θ wire

9 ©EJC 2023 9749/04/J1H2PROMO/2023 [Turn over (b) (i) Secure the cork using the clamp so that the pin is mounted horizontally. Suspend the wire on the pin so that the arrangement is as shown in Fig. 2.2. Fig 2.2 (ii) Displace the wire from its equilibrium position and release it so that it performs small oscillations in a vertical plane, as shown in Fig. 2.3. Fig 2.3 (iii) Make and record measurements to determine the period T of these oscillations. T = ................................ [1] θ wire pin

10 ©EJC 2023 9749/04/J1H2PROMO/2023 (c) Remove the wire from the pin. Change the value of θ by gently bending the wire. The new value of θ should be in the range 30 140θ≤≤oo . Repeat (b) until you have six sets of readings for θ and T. Record your results in a table. Include values of 4 1 T and cos θ in your table of results. [7] (d) (i) The quantities T and θ are related by the equation 4 1 cosABT θ= + where A and B are constants. Plot a suitable graph to determine the values of A and B. A = ...................................................... B = ...................................................... [4]