bukit batok paper 5 phy

Name: ………………………………………. Index No. ……… Class:…………… Bukit Batok Secondary SchoolPRELIMINARY EXAMINATION2020 SECONDARY 4 EXPRESS / 5 NORMAL ACADEMIC SCIENCE (PHYSICS, CHEMISTRY) 5076/05Paper5 18 August 2020 1 hour 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions. READ THESE INSTRUCTIONS FIRSTWrite your name, index number and class in the spacesprovided at the top of this page.Write in dark blue or black penYou may use an HB pencil for any diagrams, graphs,tables or rough working.Do not use staples, paper clips, glue or correctionfluid.The use of an approved calculator is expected, whereappropriate. Answerbothquestions.You are advised to spend 45 minutes on each question.Chemistry practical notes for this paper areprinted on page 10. At the end of the examination, fasten all your worksecurely together.The number of marks is given in brackets [ ] at theend of each question or part question. For Examiner’s Use Q1

Total This document consists of10printed pages. 1. You are going to use the apparatus shown in Fig. 1.1to determine a value for theacceleration of free fall, .𝑔 Fig 1.1 Fig 1.2 (a) (i) Measure the total length of the stripL. RecordL, to the nearest 0.1 cm. lengthL= ……………………………. cm [1] (ii) A line has been drawn on the strip through itscentre of mass. 1. Measure the lengthl, between the centre of mass ofyour strip and thefurthest edge of hole 1, as shown in Fig. 1.1. Record this lengthl, to the nearest 0.1 cm, in Table1.1.

BBSS/‘O’Prelim/2020/Sec4E_5N/Sc P5 2. Measure the lengthl, between the centre of mass of your strip and thefurthest edges of holes 2, 3, 4, 5 and 6. Record these values of lengthl, to the nearest 0.1cm, in Table 1.1. (b) In this part, you will set up the apparatus as shownin Fig. 1.2. Using each hole inturn, you will measure the time takenT, for the swingingstrip to completetenfullcycles. Note: You will only recordonevalue of Tfor eachlength. (i) 1. Clamp the cork as shown in Fig 1.2 and ensurethat the optical pin ishorizontal. 2. Place the pin through hole1, as shown inFig. 1.2. 3. Make sure that the strip can swing freely.Move the bottom of the strip about2 cm from its vertical position into positionAasshown in Fig. 1.2. 4. Release the strip. When thebottom of the strip returns to position A, start thestopwatch. When the stripreturns again to positionAit has completed cyclenumberone. 5. Continue to count each timethe strip returns to positionA. Stop thestopwatch at the end of cyclenumber ten. This is the time, T, fortencomplete cycles of the strip. 6. Read and record the time, T, to thenearest 0.01 s, in Table 1.1. (ii) Repeat the procedure described in(b)(i)usingholes2to6. In each case, record your value of Tto thenearest 0.01 s, in Table 1.1. (iii)Complete Table 1 .1 for each row of data bycalculating • T 2 , giving your answer to the nearest 0.1 s 2 ,• l 2 , giving your answer to the nearest whole number,• T 2 l, giving your answer to the nearest whole number. Table 1.1 hole lengthl/cm TimeT/s T 2 /s 2 l 2 /cm 2 T 2 l/s 2 cm 1 3

BBSS/‘O’Prelim/2020/Sec4E_5N/Sc P5 2 3 4 5 6 [4](c) (i) On the grid, plot a graph of T 2 l(on the y-axis)against, l 2 (on the x-axis). Draw the best-fit straight line, taking intoaccount all your plotted points. [4] (ii) Determine the gradient of your line, showingclearly on your graph how you did 4

BBSS/‘O’Prelim/2020/Sec4E_5N/Sc P5 this gradient = ………………………mm [2] (d) Determine a value for the acceleration of free fall, , using the gradient of your𝑔line, and the formula below. 𝑔 = 4π 2 𝑔𝑟𝑎𝑑𝑖𝑒𝑛𝑡 =…………………………………… . m/s 2 [2]𝑔 (e) Identify twodifferent typesof sources of error inthis experiment. For each, suggest an improvement that would reducethe error. source of error 1………………………………………………………………………….. improvement ………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. source of error 2………………………………………………………………………….. improvement ………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. [2] 5

BBSS/‘O’Prelim/2020/Sec4E_5N/Sc P5 [Total : 15 Marks] 6