2025 CHIJ SEC (TP) Physics Prelim Paper 2 QP

CONVENT OF THE HOLY INFANT JESUS SECONDARY Preliminary Examination in preparation for the General Certificate of Education Ordinary Level 2025 CANDIDATE NAME CLASS REGISTER NUMBER PHYSICS Paper 2 Structured and Free Response Candidates answer on the Question Paper. No Additional Materials are required. 6091/02 02 Septemeber 2025 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your class, register number and name on all the work you hand in. Write in dark blue or black ink. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write yours answers in the spaces provided. Section B Answer one question. Write yours answers in the spaces provided. 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, as more marks are awarded for sound use of physics than for correct answers. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 19 printed pages and 1 blank pages. [Turn over O

2 CHIJSec/2025/OLevelPrelim/6091/02 Section A Answer all the questions in this section. 1 A small spacecraft, known as Mars Express, is to land on the planet Mars. As the spacecraft enters the planet’s atmosphere, it slows down. When the speed reaches 400 m/s, parachutes open and friction with the atmosphere increases. The spacecraft eventually reaches a steady speed, and then finally it hits the surface. (a) On the axes of Fig. 1.1, complete the speed-time graph for the spacecraft. The parachutes open at time t1, and the spacecraft hits the surface of Mars at time t2 . [2] Fig. 1.1 (b) State what is meant by a gravitational field. …………..……………………………………………………………………………………………… …………..……………………………………………………………………………………………… ………………………………………………………………………………………………………..[1] (c) The mass of the spacecraft is 65 kg. At one point the gravitational field strength of Mars is 3.0 N/kg and the total upwards force on the spacecraft is 500 N. Determine (i) the weight of the spacecraft, weight = ………………..…………[1] (ii) the resultant force on the spacecraft, resultant force = ………………..…………[1] (iii) the deceleration of the spacecraft. deceleration = ……….…………………[2] [Total: 7] time / s speed m/s 0 t1 t2 400

3 [Turn over CHIJSec/2025/OLevelPrelim/6091/02 2 Fig. 2.1 shows a stone supported by two strings that hang from a rod. Fig. 2.1 The stone is stationary, and the weight of the stone is 2.6 N. The resultant of the two tensions, A and B, is equal in magnitude to the weight of the stone. (a) In the space below, draw a scaled diagram to show the resultant of the two tensions. State the scale used. Using the scaled diagram, determine the magnitude of the two tensions, A and B. scale = ………………………………. tension A = ………………………………. tension B = ………………………………. [Total: 4] A B

4 CHIJSec/2025/OLevelPrelim/6091/02 3 Fig. 3.1 shows a roller coaster in an amusement park. The total mass of the roller coaster and its passengers is 2000 kg. The speed of the roller coaster is 35 m/s at Y , which is the lowest point of the track. Z is the top of the next hump and is 20 m above ground. Fig 3.1 (a) Calculate the amount of energy in the kinetic store of the roller coaster at Y. amount of energy in kinetic store at Y = …………………………………[2] (b) Assuming there is no friction along the track from X to Y, calculate the speed of the roller coaster at X. speed at X = …………………………………[3] (c) The speed of the roller coaster is 4 .0 m/s at Z and the track between Y and Z is 40 m long. Calculate the average force of friction between the roller coaster and the track from Y to Z. average force of friction = …………………………….[2] [Total: 7] 50 m 20 m X Y Z

5 [Turn over CHIJSec/2025/OLevelPrelim/6091/02 4 Fig. 4.1 shows a heavy piston supported by gas trapped in a cylinder. Fig. 4.1 (a) The cross-sectional area of the piston is 4.0 x 10-4 m2. The pressure of the gas inside the cylinder is 2.0 x 105 Pa and atmospheric pressure is 1.0 x 105 Pa. The acceleration of free fall is 10 m/s2. Determine the mass of the piston. mass = ……………………….[3] (b) With the same piston in the cylinder, the cylinder is brought up to the top of a very high mountain. State and explain how the position of the piston in the cylinder will change. Assume the temperature of the gas remains the same. ……….……..…………………………….………………………………………………………………… ……….……..…………………………….………………………………………………………………… ……….……..…………………………….……………………………………………………………...[2] [Total: 5] gas cylinder piston

6 CHIJSec/2025/OLevelPrelim/6091/02 5 Fig. 5.1 shows an electric kettle containing some water. Fig. 5.1 (a) The specific heat capacity of water is 4200 J/kg°C. Explain the meaning of “specific heat capacity of water is 4200 J/kg°C”. ….……..………………………………………………………………………………………………... …………..………………………………………………………………………………………….. [1] (b) The 2.5 kW electric kettle contained 1.50 kg of water at 27 °C. The kettle was switched on for a period of time. Assuming there is no energy lost to the surrounding and the kettle, how long would it take for the mass of water in the kettle to decrease to 1.00 kg? Specific latent heat of vaporisation of water is 2260 000 J/kg. time taken = …………………….. [3] water heating element

7 [Turn over CHIJSec/2025/OLevelPrelim/6091/02 (c) When the kettle is switched off, the water cools down as evaporation takes place. (i) Explain, at the molecular level, why the temperature of water decreases as evaporation takes place. …....……………………………………………………………………………………………..… …....……………………………………………………………………………………………..… …....……………………………………………………………………………………………..… …....……………………………………………………………………………………………..[2] (ii) The latent heat of vaporisation is taken in by the water molecules as they leave the water surface. State how the components of the internal energy of these water molecules change as they evaporate. …....……………………………………………………………………………………………..… …....……………………………………………………………………………………………..… …....……………………………………………………………………………………………..[2] [Total: 8]

8 CHIJSec/2025/OLevelPrelim/6091/02 6 Microwaves, X-rays, infrared and ultraviolet are different types of radiation in the electromagnetic spectrum. (a) Write the name of one of these types of radiation in each of the boxes, placing them in order of increasing wavelength. shortest wavelength longest wavelength [2] (b) State two uses of infrared radiation. 1. ………................................................................................................................................... …............................................................................................................................................... 2. .............................................................................................................................................. ..............................................................................................................................................[2] (c) State one property that all types of radiation in the electromagnetic spectrum have in common. …………........................