PHS 2026 Physics P3 QP + MS

1 [Turn over Name:....................................... Register/Index Number: ............... Class: .............. PRESBYTERIAN HIGH SCHOOL PHYSICS 6091/3 Paper 3 21 August 2026 Friday 1 hour 50 minutes PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL 2026 SECONDARY FOUR EXPRESS PRELIMINARY EXAMINATION Instructions to students: DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO. Write in dark blue or black pen in the spaces provided on the Question paper. You may use a pencil for any diagrams, graphs or rough work. READ THESE INSTRUCTIONS FIRST Write your name, class register number and class in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions. All of your answers should be written in this Question Paper: scrap paper must not be used. Graph paper is provided in this Question Paper. Additional sheets of graph paper should be used only if it is necessary to do so. You will be allowed to work with the apparatus for a maximum of 55 minutes for each section. You are expected to record all your observations as soon as they are made. An account of the method of carrying out the experiments is not required. The use of an approved scientific calculator is expected, where appropriate. 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 question paper consists of 11 printed pages For Examiner’s Use 1 /10 2 /10 3 /20 Total

2 [Turn over 1 In this experiment, you will investigate the mass and volume of a dry cell. You are provided with: • a dry cell • a ruler • two set squares • an electronic balance. (a) (i) Describe one precaution you must take before measuring the mass of the dry cell using an electronic balance. ……………………………………………………………………………………………… …………………………………………………………………………………………...[1] (ii) Measure and record the mass of the dry cell. mass = ………………………….. [1] (b) (i) Draw a labelled diagram to show how to use the ruler and the set squares to measure the diameter of the dry cell. [2] (ii) Measure and record the diameter d of the dry cell. d = ………………………….. [1]

3 [Turn over (c) (i) Measure and record the total length l of the dry cell, as shown in Fig. 1.1. Fig. 1.1 (not to scale) l = ………………………….. [1] (ii) Estimate the volume V of the dry cell using the equation 𝑉 = 𝜋 4 𝑙𝑑2 V = ………………………….. [1] (iii) The volume calculated in (c)(ii) is an estimate of the volume of the dry cell. Explain why it is only an estimate and why it is a good estimate of the actual volume of the dry cell. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………….......[2] (iv) Describe how the method for determining the volume of the dry cell may be improved. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………….......[1]

4 [Turn over 2 In this experiment, you will investigate the motion of a mass on a piece of wire. You are provided with • a piece of wire • two crocodile clips • a rule • a stop-watch • a boss and a stand. (a) Place one end of the piece of wire in the jaws of one of the crocodile clips. Attach the crocodile clip to the boss and attach the boss to the stand, as shown in Fig. 2.1. Fig. 2.1

5 [Turn over Adjust the boss until the height h of the free end of the wire is approximately 30 cm above the bench, as shown in Fig. 2.2. Fig. 2.2 (i) Measure and record h. h = ………………………….. [1] (ii) Attach the second crocodile clip to the free end of the wire, as shown in Fig. 2.3. Fig. 2.3 Measure and record h1. h1 = ………………………….. Calculate the deflection y of the wire, where y = h - h1. y = ………………………….. [1] (b) Push the free end of the wire down a small distance and then release it. The wire oscillates. Determine the period T of oscillation of the wire. T = ………………………...[2]

6 [Turn over (c) A student claims that T= a √𝑦 + b, where a and b are constants and y is the deflection of the wire. Plan an experiment to investigate the student's claim. In your plan, you should: • explain briefly how to do the experiment • draw a table, with column headings, to show how to display the range of readings • explain how to determine a and b if the student's claim is correct. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………………………………………………………………………………

7 [Turn over ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………………………………………………………………………….. [5]

8 [Turn over 3 In this experiment, you will investigate combinations of resistors in an electrical circuit. You are provided with • a battery • a resistor X • an ammeter • a voltmeter • a switch • connecting leads • two 3.3Q resistors • two 10 Q resistors. Assemble the apparatus as shown in Fig. 3.1. Fig. 3.1 (a) (i) Record • the voltmeter reading V V = ……………………. • the ammeter reading I I = …………………….. Open the switch immediately after taking the readings. [2] (ii) Calculate the resistance Rx of resistor X using the equation Rx = 𝑉 𝐼 . Rx = ………………………….. [1]

9 [Turn over (b) The resistors can be connected: f- • in parallel, a