GESS 4NA ScPh Prelim P2 22

This paper consists of 12 pages including the cover page GAN ENG SENG SCHOOL Preliminary Examination 2022 CANDIDATE NAME CLASS INDEX NUMBER SCIENCE (PHYSICS) Paper 2 Sec 4 Normal (Academic) 5105/02 19 Aug 2022 Papers 1 & 2: 1 hour 15 minutes Candidates answer on the Question Paper. Calculators are allowed in the examination READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. Answer all questions in Section A and any two questions in Section B. Enter the numbers of the Section B questions you have answered on the dotted lines in the grid below. In calculations, you should show all the steps in your working, giving your answer at each stage. You are advised to spend no longer than 30 minutes on Paper 1. You may proceed to answer Paper 2 as soon as you have completed Paper 1. At the end of the examination, hand in your answers to Paper 1 and Paper 2 separately. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A Section B ………….. ………….. Total 30

GESS 4NA ScPh P2 Prelim 22 TYL (LTW) 2 Section A Answer all the questions in the spaces provided. 1 In 2014, Third Warrant Officer Shirley Ng, the first female Red Lion parachutist, jumped at the National Day Parade. (a) Name two forces acting on her that oppose each other as she falls. ………………………………………………………………………………………...…. [1] (b) As she falls, her speed changes with time as shown. (i) Suggest why the acceleration decreases between A and B. ……………………………………………………………………………………….... ……………………………………………………………………………………….... ……………………………………………………………………………………….... ………………………………………………………………………………..…… [2] (ii) At which point on the graph when the parachute was opened? …………………………………………………………………………………….. [1] (iii) State the section on the graph when she experienced constant deceleration. …………………………………………………………………………………….. [1]

GESS 4NA ScPh P2 Prelim 22 TYL (LTW) 3 2 The graph of pressure against time for a sound wave produced by a musical instrument is as shown. (a) Determine the frequency of this sound wave. frequency = ………………………… Hz [2] (b) Given that the speed of sound in the air is 340 m/s , calculate the wavelength of this sound wave. wavelength = ………………………… m [1]

GESS 4NA ScPh P2 Prelim 22 TYL (LTW) 4 3 A circuit diagram is shown. (a) Draw, on the circuit diagram above, where you would position an ammeter and a voltmeter so that the values for the total current th rough the two identical lamps and the potential difference across the lamps can be measured. [2] (b) When connected correctly, the ammeter and the voltmeter appear as shown. Use these readings to calculate the (i) resistance of each lamp, resistance = …………………………  [2] (ii) power of the lamps. power = ………………………… W [2] S

GESS 4NA ScPh P2 Prelim 22 TYL (LTW) 5 Section B Answer any two questions from this section in the spaces provided. 4 Clairessa checks the purity of a small , uniform bar of gold on the ground by measuring its density. She measures the dimensions of the bar as shown. Fig. 4 (a) She has w ritten down every digit of the rea dings from the measuring instrument that she used. Suggest the name of the instrument used. …………………………………………………………………………………………… [1] (b) Draw, on the bar above, to show its centre of gravity. Label this point as C. [1] (c) She measures the mass of the bar as 176.8 g and the weight of the bar as 1.80 N. (i) Calculate the grav itational field strength at the location where the measurements were made. gravitational field strength = ………………………… N/kg [1] (ii) Calculate the density of the bar. density = ………………………… g/cm3 [2] 40.1 mm 20.4 mm 11.2 mm

GESS 4NA ScPh P2 Prelim 22 TYL (LTW) 6 (iii) The density of pure gold is 19.281 g/cm3. State and explain whether the bar is made of pure gold. ……………………………………………………………………………………….... ……………………………………………………………………………………….... ……………………………………………………………………………………….... …………………………………………………………………………………….. [1] (iv) Determine the pressure exerted by the bar on the ground when placed as shown in Fig. 4. pressure = ………………………… N/cm2 [2]

GESS 4NA ScPh P2 Prelim 22 TYL (LTW) 7 5 Estelle investigated the heat loss fr om two brass ca ns whi ch had different surface coatings. The diagram shows the two cans at the start of the experiment when water from a boiling kettle is poured into both of them. Her results are shown in the table. time / min temperature / C can A can B 0 90 90 5 60 76 10 40 70 15 30 47 20 25 35 25 25 30 30 25 27 35 25 25 40 25 25 45 25 25 50 25 25

GESS 4NA ScPh P2 Prelim 22 TYL (LTW) 8 (a) Plot a graph of temperature against time, marking each point with a cross ( ×). Draw the best-fit line to connect the points for can B. [2] time / min  10  20  30  40  50 0 10 – 20 – 30 – 40 – 50 – 60 – 70 – 80 – 90 – temperature / C

GESS 4NA ScPh P2 Prelim 22 TYL (LTW) 9 (b) Use the inf ormation from the table and the graph to answer the following questions. (i) State which reading for can B appears to be incorrect. time = ………………………… min [1] (ii) State the room temperature at which Estelle did the experiment. temperature = ………………………… C [1] (iii) Cans A and B had either shiny / light or dull / black surfaces. 1 State the type of surface can A had. ………………………………………………………………………………. [1] 2 Give two reasons for your choice of answer in part 1 above. ………………………………………………………………………………….. ………………………………………………………………………………….. ………………………………………………………………………………….. …………………………………………………………………………,…… [2] (c) Suggest how the heat loss from both cans could have been reduced. ……………………………………………………………………………………………….. …………………………………………………………………………………………… [1]

GESS 4NA ScPh P2 Prelim 22 TYL (LTW) 10 6 (a) Evy set up an experiment to find the resistance of an unknown resistor. The circuit used is as shown. The rheo stat was ad justed several times and c urrent and potential diff erence readings were taken. The results obtained are shown in the table. current / A potential difference / V 0.1 1.6 0.2 3.2 0.3 4.8 0.4 6.4 0.5 8.0 0.6 9.6 (i) Plot a graph of potential difference against current, marking each point with a cross (×). Draw the best-fit line to connect the points. [2] unknown resistor current / A potential difference / V