ACJC 2024 J2 H2 Physics Prelim P4

This paper consists of 22 printed pages p Anglo-Chinese Junior College Physics Preliminary Examination Higher 2 CANDIDATE NAME CLASS CENTRE NUMBER S 3 0 0 4 INDEX NUMBER PHYSICS Paper 4 Practical Candidates answer on the Question Paper. Additional Materials: As listed In the Confidential Instructions 9749/04 1 August 2024 2 hours 30 mins READ THESE INSTRUCTIONS FIRST Write your name and index 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 the appropriate units. Give details of your 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. Shift Laboratory For Examiners’ use only 1 / 10 2 / 12 3 / 21 4 / 12 Total / 55

2 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use 1 In this experiment, you will investigate an electrical circuit. (a) Set up the circuit shown in Fig. 1.1. Fig. 1.1 The distance between F and G is w. Attach G to the wire so that w is approximately 70 cm. Close the switch. Record w and the ammeter reading I1. w = …………………….…………….. I1 = …………………….…………….. [1] Open the switch.

3 [Turn over Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use (b) Keep F and G in the same positions so that the value of w remains the same. Change some of the connecting wires to set up the circuit shown in Fig. 1.2. Fig. 1.2 Close the switch. Record the ammeter reading I2. I2 = …………………….…………….. Open the switch. Calculate I1I2. I1I2 = …………………….…………….. [1]

4 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use (c) Using values of w greater than 55 cm, vary w by adjusting G and repeat (a) and (b) until you have four sets of readings. Present your results clearly. [3] (d) It is suggested that w, I1 and I2 are related by the expression: 1 2 P Qw I I where P and Q are constants. (i) Plot your results on the grid and draw the line of best fit. [2] 1.00 1.20 1.40 1.60 1.80 2.00 11/mw  4 2 1 2/ 10 AI I

5 [Turn over Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use (ii) Use your graph to determine values for P and Q. P = …………………….…………….. Q = …………………….…………….. [2] (iii) Explain why the value of Q is not useful. ……………………………………………………………………………………….. ……………………………………………………………………………………….. …………………………………………………………………………...………. [1] [Total: 10]

6 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use 2 In this experiment, you will investigate the properties of a flywheel. (a) (i) A slotted mass is fixed to a length of plastic tube, as shown in Fig. 2.1. Fig. 2.1 Measure and record the diameter D1 of the slotted mass. D1 = …………………….…………….. cm Calculate C using 2 1 1 1 2 M DC where M1 = 0.100 kg. C1 = …………………….…………….. [2] (ii) Justify the number of significant figures that you have given for your value of C1. ……………………………………………………………………………………….. ……………………………………………………………………………………….. …………………………………………………………………………...………. [1]

7 [Turn over Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use (iii) Set up the apparatus as shown in Fig. 2.2. Fig. 2.2 The string tied to the tube will pass through the slot of the slotted mass as shown in Fig. 2.2. Hook the mass hanger onto the other end of the string and then adjust the height of the boss until the mass hanger is just touching the floor. wooden stick

8 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use Rotate the slotted mass and tube 20 times so that the string is wound around the tube, as shown in Fig. 2.3. Fig. 2.3 Release the slotted mass and take measurements to determine the time t for the mass hanger to reach the floor. t = …………………….…………….. [1]

9 [Turn over Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use (iv) Estimate the percentage uncertainty in your value of t. percentage uncertainty in t = …………………….…………….. [1] (b) (i) Using all the modelling clay provided, roll the modelling clay into a long cylinder and bend it to form a ring around the outside of the slotted mass, as shown in Fig. 2.4. Ensure it is securely attached to the slotted mass. Fig. 2.4

10 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use Measure and record the outside diameter D2 of the ring of modelling clay, as shown in Fig. 2.4. D2 = …………………….…………….. cm Calculate C using 2 2 1 1 2 2 1 2 ( ) 2 M D M D DC   where M2 = 0.070 kg. C2 = …………………….…………….. [2] (ii) Rotate the slotted mass and tube 20 times so that the string is wound around the tube, as shown in Fig. 2.3. Release the slotted mass and take measurements to determine the time t for the mass hanger to reach the floor. t = …………………….…………….. [1]