2022 CHIJ Phy Prelims P3

CONVENT OF THE HOLY INFANT JESUS SECONDARY Preliminary Examination in preparation for the General Certificate of Education Ordinary Level 2022 CANDIDATE NAME CLASS REGISTER NUMBER PHYSICS Paper 3 Practical Candidates answer on the Question Paper. 6091/03 12 September 2022 1 hour 50 minutes READ THESE INSTRUCTIONS FIRST Write your class, register number and name 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. Shift Laboratory For Examiner’s Use 1 2 3 Total This document consists of 12 printed pages. [Turn over

2 CHIJSec/2022/OLevelPrelim/6091/03 Section A 1 In this experiment, you will investigate the effect of a frictional load on an electric motor. You have been provided with: • A 4.5 V power supply, • a small electric motor, • an ammeter, • a voltmeter, • a resistor of resistance 10 Ω, • a switch or plug key, • electrical leads, • a wooden rod, • a piece of Blu-Tack. (a) Set up the circuit shown in Fig. 1.1. Fig. 1.1 Fix the motor to the bench using the piece of Blu-Tack, as shown in Fig. 1.2. Fig. 1.2 (i) With the switch open, record the voltmeter reading V0. V0 = ……………………………..[1] (ii) Check that the shaft of the motor is free to spin by rotating it a few times by hand. Close the switch. Record the potential difference V1 across the motor and the current I1 in the circuit. V1 = ……………………………….. I 1 = ……………………………..[2] 4.5 V 10 Ω motor motor shaft of motor bench Blu-Tack

3 CHIJSec/2022/OLevelPrelim/6091/03 (iii) Open the switch. Calculate the input power P1 to the motor using the equation shown. P1 = V1 I1 P1 = ……………………………..[1] (b) Close the switch. Use the wooden rod to press gently on the shaft of the motor, as shown in Fig. 1.3. Fig. 1.3 Press down on the wooden rod until the shaft just stops spinning. (i) Record the potential difference V2 across the motor and the current I2 when the motor is not spinning. V2 = ……………………………….. I 2 = ………………