CHIJ 4E_Phy_Prelim_P1_P2_2024_Answers

CHIJ SECONDARY (TOA PAYOH) PRELIMINARY EXAMINATION 2024 SECONDARY 4(EXPRESS) PHYSICS 6091/01 Paper 1 1 A 11 C 21 C 31 C 2 D 12 C 22 B 32 A 3 D 13 C 23 A 33 B 4 B 14 B 24 D 34 D 5 B 15 C 25 B 35 D 6 C 16 B 26 D 36 B 7 A 17 D 27 C 37 C 8 B 18 B 28 A 38 C 9 C 19 C 29 B 39 A 10 B 20 A 30 A 40 C Paper 2 6091/02 Qn Answers Ma rk 1(a)(i) Total distance = 40 + 35 + 10 = 85 m 1 1(a)(ii) Average speed = total distance / time Average speed = 85 / 60 = 1.42 m/s 1 1 1(b)(i) Distance is a scalar quantity, velocity is a vector quantity. OR Distance has no direction, velocity has a specific direction. 1 1(b)(ii) 5m 1 1(b)(iii) 45 m 1 1(c) Velocity is the rate of change of displacement. 1 1(d) Velocity = total displacement / total time Average speed = total distance/ total time As the time taken is the same (60s), magnitude of the total displacement is much smaller than the total distance. OR First drone travelled a greater distance within the same amount of time as compared with the second drone. 1 2(a) Stone is moving with constant acceleration (10 m/s2). 1 2(b) Area under the graph AB represents the original height dropped. Area under the graph CD represents the rebound height. Area under the graph AB is smaller than the area under the graph CD. 1 1 2(c) 1. 10 – 8 = 2 m/s 2. 10 – (-8) = 18 m/s 1 1 3(a)(i) The downward force is due to the Earth’s gravitational attraction on the lamina. 1 3(a)(ii) W = mg W = 60/1000 x 10 = 0.6 N 1 1 3(b)(i) Moment = force x perpendicular distance of force from pivot Moment = 0.6 x 8.0 = 4.8 Ncm or 0.048 Nm 1 1

3(b)(ii) - When released, lamina will swing such that the centre of gravity becomes on the left side of the pivot. This creates anti-clockwise moment and lamina will swing back to its original side. - Lamina will continue to swing left and right until it eventually comes to a stop with its centre of gravity directly below the pivot. 1 1 4(a) Chemical potential energy 1 4(b)(i) Thermal energy is transferred to the man via radiation. Thermal energy is transferred in the form of infrared waves. 1 1 4(b)(ii) Shiny surface is a poor absorber of radiation. This helps to reduce energy loss from the heater. 1 1 4(b)(iii) The black pullover acts as a good absorber of radiation. OR The pockets of trapped air in the pullover act as a good thermal insulator. 1 5(a)(i) Any one: Infrared, Ultraviolet, visible light, X-rays, gamma rays 1 5(a)(ii) - All electromagnetic waves travel at the same speed in vacuum. - Since v = f, waves with wavelength shorter than microwaves will have frequency higher than microwaves. 1 1 5(b)(i) Aerials are placed on top of high buildings or tower to avoid any obstruction caused by other buildings or structures. 1 5(b)(ii) - Microwaves loses some of its energy as they travel over large distanc