2022 YTSS Phy Prelims P3 Ans

ANSWER 4E P-Phy Prelim P3 2022 (V3) 1 This paper will assess the following skills areas: Planning (P) Manipulation, measurement and observation (MMO) Presentation of data and observations (PDO) Analysis, conclusions and evaluation (ACE) Go through Video at: https://tinyurl.com/ytssprelimP32022 Name: . Index: . Class: . Only penalise once per question on unit and precision error respectively. Notation: dp: condone second precision error in reading. sf: condone second precision error in calculation. uu: condone second error in units. Ques Answer Marks Score 1(a) MMO I is measured to 2 dp in A. (FYR: 0.30 A – 0.50 A) 1 MMO V is measured to 2 dp in V. (FYR: 1.30 V – 1.60 V) 1 ACE (Working should be clearly shown) (condone) E.g. 0.30 x 1.30 = 0.39 W (2sf) Correct calculation of P in W and recorded in least sf. (2 sf.) P should be in the range of 0.30 W to 1.5 W. (condone) 1 1(c) ACE (Working should be clearly shown) (condone) Correct calculation of m in g and recorded in least sf. (2 sf.) m = 36 g 1 1(d) MMO t is measured to 1 dp in s. (condone 2 dp) t should be in the range of 55 s to 150 s. 1 1(e) Plan  Stating at least two controlled quantities correctly:  The (mass or volume or type) of oil.  The power of the heater.  The EMF of battery.  The resistance of the heater.  The type of heater Do NOT accept “The circuit / The oil / The wires / Type of wire” 1  The graph plot should have the independent variable as X-axis and dependent variable as Y-axis  Possible answer includes: 1  for graphs: 1

ANSWER 4E P-Phy Prelim P3 2022 (V3) 2 Ques Answer Marks Score c = (gradient) x P/m c = (gradient) /m c = (gradient) /m c = (gradient) x P/Δθ c = (gradient) /Δθ Mark according to the graph to be plotted t / s / oC V / cm3 m / g t / s 1  Describe how the exp should be performed by including:  Two measure and record steps for IV and DV using the the correct equipment respectively.  Calculation step (e.g. Pt or /P)  Tabulation step . (condone missing quantities here)  Repeat step to obtain 4 or 5 other sets of data  Plotting step (condone wrong graph here) Plan should be expressed as steps each starting on a new line. Key action words must be used. Otherwise, loss this [1] 1 Ques Answer Marks Score 2(c) MMO u is measured to 1 dp in cm. 1 2(d) ACE EITHER use a ruler to determine the thickness of the lens, t. measure the distance between the insert and the lowest point of the lens, d. calculate u = d + t/2 OR other ideas that make sense. 1 2(e) ACE Show evidence of averaging. MMO h1 measured to 1 dp in cm. (FYR: h1 = 1.7 cm) 1 1 2(f) ACE 1

ANSWER 4E P-Phy Prelim P3 2022 (V3) 3 Ques Answer Marks Score  It is difficult to measure h1 on a curved surface  light reflect into the eyes making it hard to read the scale  difficult to align the scale of the ruler to the scale of the image  accept lens is not parallel to the page / cannot be held at fixed height DO NOT ACCEPT image is blur or distorted 2(g) ACE M is calculated correctly and recorded to the least sf (2 sf) between 2.0 to 4.0 1 2(h) ACE f1 is calculated correctly and recorded to the least sf (2 sf) in cm 1 2(i) MMO f2 measured to 1 dp in cm. (FYR: f2 = 9.0 cm) 1 2(j) ACE  Work on the %difference as supporting evidence. (Condone difference)  Make a conclusion base on the evidence 1 1 Ques Answer Marks Score 3(b) MMO T is measured to 2 dp and in N. (FYR: T = 0.12N, ϑ = 65o) 1 3(c) ACE Answer given in 2 sf. (FYR: 0.47 – 0.84) DO NOT accept the 1/tan = adj/opp method 1 3(d) ACE Use the ruler and ensure that the height from the bench to X and to Y are the same. 1 3(e) MMO 5 sets of data including 3(b) and (c) 1 PDO Min range of is 35 degrees 1 PDO Table heading: /o, and T/N 1 PDO Data recorded to the correct precision. in 0 dp, in 2sf and T in 2 dp. 1 PDO Correct trend, as increases, T decreases. (condone 1 exception) 1

ANSWER 4E P-Phy Prelim P3 2022 (V3) 4 Ques Answer Marks Score 3(f) PDO Graph drawn with T as y-axis and 1/tan as x-axis, and correctly labelled with units. 1 PDO Sufficient scale marking every 2 cm and suitable scale - not based on 3, 6, 7, etc. Points occupy at least half of the graph paper in both axes. 1 PDO All points plotted correctly. (Within half the smallest grid square) 1 PDO Best fit line is drawn. 1 3(g) ACE Identified and labelled two coordinates on the graph and use of a triangle that uses more than half the drawn line. 1 ACE Correct calculation of gradient. The input data should be read to half the smallest square (Condone) on the grid. Answer to be given in least s.f. and correct unit (in N). 1 MNO gradient is in the range of 0.4 to 0.6. 1 3(h) MMO WD is recorded as 2 dp and in N. 1 3(i) ACE Student should use the value of the gradient and compare it with WD. 1 3(j) ACE When , according to the equation, tension in XY T will need to be at infinity (or larger than the range of the newton meter). 1 3(k) ACE Award (2) as long (R)(I) or (D)(I) are mentioned. (D) There is no reference horizontal to string XY (R) Difficult to measure in mid-air (I) Hence, the measurement of is affected (D) There is no reference horizontal to string XY (R) Difficult to ensure that the spring balance is horizontal (I) Hence, the measurement T is affected. 2

ANSWER 4E P-Phy Prelim P3 2022 (V3) 5 INTERNAL DATA – NOT FOR SHARING Unknown mass used is 50g ϑ / o 1/tan ϑ T 65 0.46630 8 0.12 57 0.64940 8 0.25 47 0.93251 5 0.38 40 1.19175 4 0.47 35 1.42814 8 0.63 30 1.73205 1 0.77 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 f(x) = 0.500580338846451 x − 0.0973009411447735 T vs 1/tan ϑ