2016 H2 Physics MS EJC Suggested

©EJC 2020 H2 PHYSICS SUGGESTED MARK SCHEME 9646 October/November 2016 Paper 1 Multiple Choice Qns Key Qns Key Qns Key Qns Key 1 B 11 A 21 C 31 A 2 C 12 D 22 D 32 C 3 B 13 D 23 D 33 D 4 D 14 C 24 C 34 B 5 D 15 C 25 C 35 B 6 C 16 A 26 B 36 B 7 D 17 D 27 C 37 D 8 D 18 A 28 A 38 C 9 B 19 B 29 B 39 C 10 C 20 D 30 B 40 C Notes: Q5: Ball must fall again to reach ground after rising, so need a multiplier of 2.

2 ©EJC 2020 Paper 2 Structured Questions Note: Need to read questions, diagrams and graphs carefully. Definitions need to be precise. Qns Marks 1(a) SI unit for electrical resistance is when a potential difference of one volt per ampere of current flows through a conductor Note: do not make mistake of defining resistance or mixing up units/quantities. B1 1(b)(i) ( ) 1 50 0 32 4 6875 VR R V. . . = = = = Ω I I ( ) ( ) 2 2 23 2 7 2 4 0 23 10 1 4 0 4 87 10 40 R dR RA R LL L R L A d . . ρ π πρ π − − − =     = = = × = × = ×  Ω Note: be careful of the powers of ten for mm and cm C1 C1 M1 A1

3 ©EJC 2020 Qns Marks 1(b)(ii) ( ) 22 7 8 4 0 01 0 01 1 4 2 2 00 1 014 87 10 2 6 2 10 50 0 23 0 3 40 0 m 2 RV LL Vd L Vd L .. . .. . dd Vd L Vd L ... . ππρ ρ ρ ρρ − − = =   ∆∆ ∆∆∆= + ++ ∆ ∆∆∆∆= + + + =× + ++  =   ×Ω I I I I I Note: since d is squared, there needs to be a multiplier of 2 to its associated fractional uncertainty. OR ( ) ( ) ( ) ( ) 22 max min 2 2 max max min min min min max max 2233 22 4 1 2 24 0 24 10 4 1 51 1 49 03 1 3 99 03 0 22 10 81 3 0410 0 1 RV LL V V LL .. .. . dd d d .. . ππρ ρρρ π π −− −− = =   ∆=  =       −  −           ××  = −      ××    I II 86 2 10 m. −    = ×Ω Note: actual uncertainty should be quoted to 2 s.f. It is only 1 s.f. when paired with the actual quantity, as per the next part. M1 A1 M1 A1 1(b)(iii) ( ) 749 06 1 0 m..ρ −=±×Ω Note: need to check that the power of tens are the same before quoting the quantity to the 1 s.f. version of the actual uncertainty. A1 1(c) Accuracy is how close a measurement is to the true value. Accepted value lies within the range in the answer to (b)(iii) of ( ) 749 06 1 0 m..ρ −=±×Ω and so is accurate. Precision is the degree to which repeated measurements agree with each other. The range of values result in a percentage uncertainty 06 4100 100 129 . .% %%ρ ρ ∆ ×= ×= and so precision is poor. Note: answer needs to make reference to the value in part (b)(iii). B1 B1

4 ©EJC 2020 Qns Marks 2(a) When t = 0.70 s, F = 6.4 N 2 64 40 1 6 ms F ma F.a . . m −= = = = M1 (read graph) A1 2(b) B1: 21 6 ms. a −= until t = 1.4 s, B1: straight line until (4.2, 0) 2(c) Area under F – t graph i