RI 2024 J2 H2 Physics Prelim P4

Centre Number Class Index Number Name Class S3016 RAFFLES INSTITUTION 2024 Preliminary Examination PHYSICS Higher 2 Paper 4 Practical 9749/04 12 August 2024 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST Write your index number, name and class in the spaces provided 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. Candidates answer on the Question Paper. You will be allowed a maximum of one hour to work with the apparatus for Questions 1 and 2, and maximum of one hour for Question 3. You are advised to spend approximately 30 minutes for Question 4. 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 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. Shift Laboratory For Examiner’s Use 1 / 12 2 / 10 3 / 22 4 / 11 Total / 55 This document consists of 21 printed pages and 3 blank pages.

2 ©Raffles Institution 9749/04 1 In this experiment, you will investigate the force required to lift different masses. Fig. 1.1 (a) Set up the apparatus as shown in Fig. 1.1. Hang the pulleys to the rods of the clamps. The top of the pulleys should be approximately 42 cm above the bench. Pass the string through the pulleys. Attach the end of the string with a small loop to the mass hanger and the other end to a ball of modelling clay. The mass of the ball is 1m and the mass of the mass hanger is 2m . Ensure that the ball is suspended above the bench while the mass hanger is resting on the base of the retort stand with the string taut. Adjust the distance between the retort stands until 0h is about 5 cm above the bench. Measure and record 0h . 0h = ball m1 bosses bench mass hanger m2 rod of clamp rod of clamp string h0 pulleypulley retort stand

3 ©Raffles Institution 9749/04 [Turn over (b) Raise the ball to a height h above the bench as shown in Fig. 1.2. Release the ball such that it moves in a circular path. Ensure that the string is taut and the mass hanger is resting on the base of the retort stand at the point of release of the ball. The minimum height of the ball required to just lift the mass hanger off the base of the retort stand is h. Fig. 1.2 Measure and record h. Calculate h where 0h h h = − . h = h = [1] h ball

4 ©Raffles Institution 9749/04 (c) Using the same ball of mass 1m , vary 2m by adding slotted masses to the mass hanger and repeat (b). Present your results clearly. [3] (d) h and 2m are related by the expression: 2 1 amha m = − where a and 1m are constants. (i) Plot a graph of h against 2m to determine a and 1m . a = 1m = [5] (ii) Explain the significance of the horizontal intercept of the graph. [1]

5 ©Raffles Institution 9749/04 [Turn over

6 ©Raffles Institution 9749/04 (e) (i) Suggest one significant source of uncertainty in this experiment. [1] (ii) Suggest an improvement that could be made to the experiment to reduce the uncertainty identified in (e)(i). You may suggest the use of other apparatus or a different procedure. [1] [Total: 12]

7 ©Raffles Institution 9749/04 [Turn over 2 In this experiment, you will investigate the properties of a dry cell. (a) Set up the circuit as shown in Fig. 2.1. Fig. 2.1 (b) (i) Close the switch. Adjust the resistance of the variable resistor until the ammeter reading I is as close to 0.5 A as possible. Measure and record the ammeter reading I. I = (ii) Open the switch. (c) A resistor of resistance R is made using three 1.0  resistors connected as shown in Fig. 2.2. Fig. 2.2 Set up the circuit as shown in Fig. 2.3 . The resistance of the variable resistor should be the same as that in (b)(i). Fig. 2.3 (i) Record the effective resistance R. R = (ii) Close the switch. Measure and record the ammeter reading I. I = (iii) Open the switch. A  R 1.0  1.0  1.0  R A

8 ©Raffles Institution 9749/04 (d) Vary R by re-arranging the 1.0  resistors and repeat (c). You may use any number of the 1.0  resistors. Present your results clearly. [3] (e) R and I are related by the expression: 1 Rr EE=+I where E is the electromotive force (e.m.f.) of the dry cell and r is the sum of the resistance of the variable resistor and the internal resistance of the dry cell. Plot a suitable graph to determine a value for E and r. E = r = [6]

9 ©Raffles Institution 9749/04 [Turn over (f) Without taking further readings, sketch a line on your graph to show the results you would expect if the experiment was repeated with a dry cell with a larger e.m.f. and a smaller internal resistance than the one used. Label this line Z. [1] [Total: 10] 0.0 0.5 1.0 1.5 2.0 2.5 3.0 R / 

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