2025 CHIJ SEC (TP) Physics Prelim Paper 1 and 2 MS

CHIJ SECONDARY (TOA PAYOH) PRELIMINARY EXAMINATION 2025 SECONDARY 4(EXPRESS) PHYSICS 6091/01 Paper 1 1 A 11 C 21 B 31 B 2 A 12 C 22 B 32 C 3 D 13 D 23 C 33 A 4 D 14 C 24 D 34 A 5 B 15 B 25 B 35 C 6 C 16 C 26 C 36 D 7 C 17 B 27 B 37 D 8 D 18 D 28 C 38 B 9 D 19 B 29 D 39 B 10 C 20 C 30 A 40 C Paper 2 6091/02 Qn Answers Mark 1(a) - Correct curve - Horizontal straight line towards t2 1 1 1(b) A gravitational field is a region where a mass experiences a force due to gravity (gravitational attraction). 1 1(c)(i) W = mg W = 65 x 3.0 = 195 N 1 1(c)(ii) Resultant force = 500 – 195 = 305 N 1 1(c)(iii) F = ma 305 = 65 x a a = 4.69 m/s2 1 1

2(a) - Appropriate scale - Tension A = 1.3 N - Tension B = 2.0 N - Correct addition of vectors 1 1 1 1 3(a) KE = ½ mv2 KE = ½ x 2000 x 352 KE = 1.23 MJ 1 1 3(b) KE at X + GPE at X = KE at Y KE at X = 1.23 MJ – [2000x10x50] KE at X = 225 kJ ½ mv2 = 225 000 J ½ x 2000 x v2 = 225 000 v = 15 m/s 1 1 1 3(c) KE at Y = KE at Z + GPE at Z + work done against friction 1.23 MJ = [1/2 x 2000 x 4.02] + [2000x10x20] + [friction x 40] friction = 20.2 kN 1 1 4(a) Atmospheric pressure + pressure due to cylinder = pressure of gas Pressure due to cylinder = Pressure of gas – Atmospheric pressure = 2.0 x 105 – 1.0 x105 = 1.0 x 105 Pa Pressure = force / area 1.0 x 105 = weight / 4.0 x 10-4 Weight = 40 N W = mg m = 40 / 10 = 4 kg 1 1 1 4(b)(i) - Pressure of gas decreases. / AP decreases. - Volume of gas increases, piston will move upwards. 1 1 5(a) 4200 J of energy is required for 1 kg of water to change its temperature by 1 ºC. 1 5(b) Let the time be t energy lost = energy gained power x time = m1cθ + m2lv 2500 x t = [1.50 x 4200 x (100 – 27)] + [0.50 x 2260 000] t = 636 s or 10.6 minutes 1 1 1

5(c)(i) - During evaporation, the faster moving particles at the surface have enough energy to break away from the other liquid particles to escape into the air. - The remaining particles left behind have a slightly lower average speed. As temperature decreases with the average kinetic energy of the particles, water is slightly cooler. 1 1 5(c)(ii) - Internal kinetic energy remains the same - Internal potential energy is increased 1 1 6(a) x-rays, ultraviolet, infrared, microwaves 1 marks for every 2 correct positions 2 6(b) Any 2: - Remote control for electrical appliances - Data transfer between devices such as mobile phones and laptops - Camera auto-focusing function - Contactless Thermometers - Intruders alarm 2 6(c) Any 1: - All obey the wave equation, v = fλ - All travel at 3 x 108 m/s in vacuum - All transfer energy - All undergo reflections and refractions - All are transverse