2024 NASS Sc(Phy) P2

1 NAS/2024/Prelim/4E/Science (Physics)/5086/02 Name: ..................................................................... Register no: .......... Class: ................... ... NGEE ANN SECONDARY SCHOOL O PRELIMINARY EXAMINATION SCIENCE (PHYSICS/CHEMISTRY) 5086/02 PAPER 2 23 August 2024 1 h 15 min Additional materials: NIL READ THESE INSTRUCTIONS FIRST Write your name and index number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs, tables or rough working. Section A Answer all questions. Section B Answer any one questions out of two. Write your answers in the spaces provided. At the end of the examination, fasten all your papers securely together. The number of marks is given in brackets [ ] at the end of each question or part question. Checked by student: _____________________ Date: ______________ This document consists of 17 printed pages and 1 blank page (Including this cover page) For Examiner’s Use Question Marks Section A /55 Section B /10 Total /65

2 NAS/2024/Prelim/4E/Science (Physics)/5086/02 Section A – 55 Marks Answer all questions in the spaces provided. 1 Fig. 1.1 shows the speed-time graph of a car. Fig. 1.1 (a) Describe the difference in the motion s of the car during the time from the 10 th to the 14th second and the time from the 5th to the 10th second. ………………………………………………………………...……………………….…...… …………………………………………………………………………………….………. [1] (b) Calculate acceleration of the car from the 10th to the 14th second. Acceleration = ……………………. m/s2 [2] (c) The car moves with uniform deceleration to rest from the 14 th to the 18 th second. Complete the graph on Fig. 1.1 to represent this. [1] (d) Calculate the distance moved for the first 10 seconds. Distance = ………….. m [2] speed / ms-1 time / s 6 10 20 0 5 10 14 18

3 NAS/2024/Prelim/4E/Science (Physics)/5086/02 2 Fig 2.1 shows a bus of mass 2400 kg moving along a straight road. The engine produces a forward force of 12000 N. The bus also experiences a total retarding force of 3200 N. (a) Calculate the acceleration of the bus. Acceleration = ……………..m/s2 [2] (b) The acceleration of the bus gradually decreases until the bus comes to a uniform speed although the driving force remained constant. Explain why this happens. ………….…………………………………………………………………………………. ………….…………………………………………………………………………………. ………….………………………………………………………………………………[2] Fig 2.1

4 NAS/2024/Prelim/4E/Science (Physics)/5086/02 3 Fig. 3.1 shows a uniform metre rule balanced on a pivot at the 40 cm mark. The metre rule balances when a load of 5 N is suspended at the 20 cm mark. Fig. 3.1 (a) On Fig. 3.1, indicate the weight of the rule acting in the correct position. [2] Calculate the weight of the metre rule. Weight = ……………….. N [2] (b) 4 A Bunsen burner is used to heat a beaker full of water. Fig 4.1 (a) State the process whereby energy is transferred from the tripod stand to the bottom of the beaker. ………………………………………………………………………………………….[1] 5 N 0 cm 20 cm 40 cm Tripod stand

5 NAS/2024/Prelim/4E/Science (Physics)/5086/02 (b) (i) Draw the direction of the convection current set up within the beaker of water [1] (ii) Explain how energy is transferred through the water. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………[2] (c) Compare the molecular structure of water and water vapour in terms of their intermolecular forces and distance between molecules. [2] Intermolecular forces Distance between molecules Water Water vapour 5 When a vacuum flask is used, heat loss by conduction, convection and radiation are greatly reduced. Explain how the following features reduce energy transfer to the surrounding. (a) The plastic stopper. …………………………………………………………………………………………... …………………………………………………………………………………….…...[1] (b) Vacuum between double glass. …………………………………………………………………….……………………... ……………………………………………………………………….………………...[1] (c) The wall of the glass is silvered. ……………………………………………………………………….…………………... …………………………………………………………………….…………………...[1]

6 NAS/2024/Prelim/4E/Science (Physics)/5086/02 6 Fig 6.1 shows sea waves approaching a beach at a speed of 1.2 m/s. Fig 6.1 The wave takes 3.0 s to travel from X to Y. (a) State, in metre, the size of the amplitude of the sea wave. Amplitude = …………………m [1] (b) Calculate the distance between X and Y. Distance = ………………m [1] (c) Calculate the wavelength of the wave. Wavelength = ………………………m [1] 1.2 m/s Sea waves Sand X Y Z 80cm

7 NAS/2024/Prelim/4E/Science (Physics)/5086/02 7 (a) The diagram below shows an object O placed in front of a converging lens. Using ray diagrams, locate and draw the image of O. Label it as I. F is the focal points of the lens. [2] (b) State two characteristics of the image formed. …………………………………………………………………………………………………[1] O F F

8 NAS/2024/Prelim/4E/Science (Physics)/5086/02 8 Fig. 8.1 shows a small and charged sphere S suspended by an insulating thread. It is attracted towards a large positive charged metal sphere L supported on an insulating stand. Fig. 8.1 (a) Draw and label on Fig. 8.1, all the forces acting on sphere S. [2] (b) Explain why S is attracted towards L. …………………………………………...…………………………………………..……… ……………………………………………………………………………………............[1]

9 NAS/2024/Prelim/4E/Science (Physics)/5086/02 9 Fig. 9.1 shows an ultrasound emitted downwards from a ship. The ultrasound is reflected from the seabed and is detected as it arrives back at the ship. Fig. 9.1 The time between emitting the ultrasound and detecting it back at the ship is 0.58 s. The seabed is 540 m below the ship. (a) Describe the movement of sound waves in the water.` ..……………………………………………………………………..……………………… …..…………………………………………………………………………………………[1] (b) Calculate the speed of sound in seawater. Speed of sound = ………………. m/s [2] (c) If the frequency of the sound is doubled, state the effect, if any, this has on the speed of the ultrasound. ..……………………………………………………………………..……………………… ….…………………………………………………………………………………………[1]

10 NAS/2024/Prelim/4E/Science (Physics)/5086/02 10 Fig 10.1 shows an electric circuit. Fig. 10.1 (a) Calculate the total resistance of the circuit. Resistance = …………………… Ω [2] (b) What is the reading on the ammeter? Ammeter = ………………… A [2] (c) Calculate the charge that passes through the ammeter in 1 min. Charge = …………………… C [2] A V 5 V 2 Ω 3 Ω 4 Ω 1 Ω