PHS 2026 Physics P2 QP + MS

1 [Turn over Name:....................................... Register/Index Number: ............... Class: .............. PRESBYTERIAN HIGH SCHOOL PHYSICS 6091/2 Paper 2 27 August 2026 Thursday 1 hour 45 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 CANDIDATES DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO Write your class, register number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glues or correction fluid. Section A Answer all questions in the spaces provided. Section B Answer one question in this section. The number of marks is given in brackets [ ] at the end of each question or part question. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. Candidates are advised to show all their working in a clear and orderly manner. At the end of the examination, submit Question 1 to 9 and Questions 10 to 13 separately. This document consists of 20 printed pages. For Examiner’s Use Section A 70 Section B 10 Total 80

2 [Turn over Section A (70 marks) Answer all the questions in the spaces provided. 1 A piece of paper falls from 4.0 m above the ground. Fig. 1.1 shows how the height h above the ground varies with the time t. Fig. 1.1 (a) Calculate the speed of the paper at t = 1.5 s. speed = ……………………[2] (b) Determine the average speed of the paper between time t = 0 and t = 1.0 s. average speed = ……………………[1] (c) Using ideas on forces, describe and explain the motion of the paper as it falls. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ……………………………………………………………………………………………….. …………………………………………………………………………………………….[3]

3 [Turn over 2 Fig. 2.1 shows a block of mass being hung from the ceiling using 2 different ropes. Fig. 2.1 By the use of a scale diagram of the forces acting on the block, find the weight of the block of mass. weight = ……………………..[3] ceiling block of mass 760 N 980 N 40o 30o

4 [Turn over 3 Fig. 3.1 shows a device for punching holes in a piece of paper. A person applies a force F at the end of the arm. Just before the hole is made in the paper, the arm is at rest. Fig. 3.1 (a) Just before the hole is made, the force upwards on the steel rod is 7.2 N. Calculate the value of F. Use the distances marked on Fig. 3.1. F = …………………………[2] (b) The steel rod pushes the paper into the hole in the metal base with a force of 7.2 N. The end of the steel rod has an area of 280 cm2. Calculate the pressure exerted on the paper. pressure = …………………………[2] (c) In actual, the weight of the arm is not negligible. (i) Describe how it affects the force F required to punch a hole. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………..[2] (ii) State the other force that is part of the action-reaction with the weight of the arm. ……………………………………………………………………………………... [1] 1.0 cm 8.0 cm force F pivot steel rod paper metal base arm

5 [Turn over 4 Fig. 4.1 shows apparatus to measure the specific latent heat of fusion of water. Fig. 4.1 The heater is switched on and water drips into the beaker at a constant rate. In 2.0 minutes, 31 g of water drips into the beaker. The power of the heater is 85 W. (a) Explain how thermal energy is transferred from the electric heater to the ice. …………………………………………………………………………………………….... …………………………………………………………………………………………….... …………………………………………………………………………………………….... ……………………………………………………………………………………………… …………………………………………………………………………………………...[2] (b) Calculate the specific latent heat of fusion of water. specific latent heat of fusion of water = …………………………[2] electric heater crushed ice at 0oC funnel glass beaker

6 [Turn over 5 Microwaves are waves in the electromagnetic spectrum. (a) State the name of waves in one other part of the electromagnetic spectrum that have wavelengths longer than microwaves. …………………………………………………………………………………………...[1] (b) A wave in the electromagnetic spectrum has a wavelength longer than microwaves. Explain why the frequency of this wave is lower than the frequency of microwaves. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………………………………………………………………………….. [2] (c) Microwaves are sometimes used to send telephone messages over long distances. They are sent from large dish aerials on top of high buildings or towers. State why the aerials are placed on top of high buildings or towers. …………………………………………………………………………………………….... …………………………………………………………………………………………...[1] 6 Ultrasound has many uses. (a) Define ultrasound. ……………………………………………………………………………………………... ………………………………………………………………………………………….. [1] (b) Fig. 6.1 shows how ultrasound is used to produce an image of the heart. Fig. 6.1 Describe how particles in the body move as the ultrasound passes. ……………………………………………………………………………………………… …………………………………………………………………………………………….... ……………………………………………………………………………………………[2] ultrasound ultrasound transmitter and detector heart

7 [Turn over (c) Ultrasound may be used to measure the depth of the sea. Fig. 6.2 shows a pulse of ultrasound sent down to the sea bed and the reflected pulse returning to the ship. Fig. 6.2 Fig. 6.3 is a cathode-ray oscilloscope (c.r.o.) trace of the pulses of ultrasound sent from the ship and the reflected pulses. Fig. 6.3 The speed of ultrasound in water is 1500 m/s and the wavelength of the ultrasound wave is 0.030 m. The time-base setting for the x-axis on the c.r.o. is 0.10 s/division. Calculate (i) the frequency of the ultrasound wave, frequency = …………………….[2] (ii) the time taken for the ultrasound pulse to reach the sea bed, time = …………………….[1] distance to sea bed sea pulses sent from ship reflected pulses from sea bed one division 0.10 s

8 [Turn over (iii) the distance to the sea bed. distance = …………………….[2] (iv) Explain why the amplitude of the reflected pulse is smaller than that of the pulse sent from the ship. ………………………………………………………………………………………….. ……………………………………………………………………………………......[1] 7 Fig. 7.1 is a circuit used to monitor changes in room temperature. Fig. 7.1 A thermistor is connected in series with a 6.0 V battery and a 2000 Ω resistor. (a) The temperature of the room increases. State and explain what happens to (i) the reading on the ammeter, ………………………………………………………………………………………… ……………………………………………………