Use this ZIMSEC O-Level Physics Paper 4 November 2009 marking scheme for checking answers, revision, and exam preparation in Zimbabwe.
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This is the ZIMSEC O-Level Physics marking scheme for Paper 4 from November 2009. It shows how marks are awarded, so you can mark your own answers.
MARKING ScHEME: 918814
1 Measurements and observations NOV2009
M1 readings
3
Write the number of readings as a ringed total by the results table
Check a value for $\log \mathrm{T}$. Tick if correct
If incorrect, write in correct value and -1
Check a value for $\log \mathrm{m}$. Tick if correct.
If incorrect, write in correct value and -1 .
Ignore small rounding errors.
6 sets of readings scores 3 marks. 6/6
5 sets of readings scores 2 marks. 5/6
4 sets of readings scores 1 mark. $\quad 46$.
If help given by supervisor then -1 , excessive help then -2 .
If help is given from the Supervisor then write 'SR' in a ring at the top of the front page of the candidate's script. Also, please indicate the type ${ }^{\text {e }}$ of help given in a written comment by the table of results.
M2 Repeated readings for $t \quad 1 / 2$ not being the game 1
M3 Quality of results
Judge by scatter of points about the lines of best fit
1
M4 'A' must have same number of significant figures as T since it is $\log \mathrm{T}$ intercept
Presentation of results
(1) Ref log 1
R1 Column headings
Every column must be headed with a quantity and a correct unit.
1
Allow $\log (T / S)$ and $\log (M / k g)(\ln (T / s)+\ln (M / \operatorname{sg})$
Do not allow $\log \mathrm{T}$ nor $\log \mathrm{M}$
R2 Consistency of raw readings given in the table of results.
1
Apply to raw values of $t$ and $m$ only.
All raw readings of a particular quantity must be given to the same degree of precision (e.g. if one value of t is measured to 2 d.p. then all values of to should be given to $2 \mathrm{~d} . \mathrm{p}$.)
Write $\checkmark c$ at the foot of the column for each correct column of raw readings.
Ring any inconsistency noted, write $\mathrm{X}_{\mathrm{c}}$ at the foot of the column, and -1 .
R3 SF in calculated quantities
1
Apply to $\log (\mathrm{T} / \mathrm{S})$ and $\log (\mathrm{M} / \mathrm{kg})$
No 5 f in $T=$ \#dp in $\log T$ Aw. (A) luehrive of mantisa in \# of $55^{-}$ as to logs