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# 2008 answers.pdf

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McGill University

Physics

PHYS 101

sholtz

Fall

Description

3. CORRECTION KEY
Part A
Questions 1 to 14 marks or 0 marks
1 A
2 C
3 A
4 D
5 A
6 B
7 B
8 D
9 C
10 D
11 C
12 D
C
13
14 C
15 B GUIDELINES FOR CORRECTING CONSTRUCTED-RESPONSE QUESTIONS
The marking scale for correcting the answers to the constructed-response questions of the
examination is presented below, along with explanations of the terms used in the scale.
It is IMPORTANT that the teacher read this information carefully before correcting the
examination.
Constructed-response questions usually consist of two parts: the procedure used to solve the
problem and the answer. Thus, a constructed-response question should be corrected in two steps.
Step 1
Analyze the work to understand the procedure used by the student, and then decide if the
procedure is appropriate or not.
A procedure is appropriate if the steps presented could lead to the correct answer.
A procedure is partially appropriate if the steps presented do not lead to the correct answer,
but include at least one step that is relevant and correct.
A procedure is inappropriate if none of the steps presented are relevant or if the student has
not shown any work.
Step 2
If the procedure is deemed appropriate, then evaluate the answer. If the answer is incorrect,
identify the type of error made.
The error is considered minor if it is an error in calculation or transcription, if the unit of
measurement is incorrect or missing, or if the student has rounded off a number incorrectly.
The error is considered major if a law, rule, or formula has been applied incorrectly.
No marks are allotted for a correct answer when the procedure used is inappropriate.
Do not penalize students for having used the incorrect number of significant figures. Part B
Example of an appropriate and complete solution /4
16
Find f:
1 1 1
= +
f 4000 10
1
= 0.10025
f
f = 9.98 10 cm
Find di
1 1 1
= +
f d o di
1 1 1
= +
10 8 d i
di= 40cm
Find M:
M = d i
do
M = 40 = 5
8
Answer: The magnification is 5.
4 marks The student chose an appropriate procedure and applied it correctly; the final answer
is correct
3 marks The student chose an appropriate procedure, but made minor errors in applying it or
made an error in units.
2 marks The student chose an appropriate procedure, but made major errors in applying it.
e.g. The student determined the distance of the image.
1 mark The students procedure was partially appropriate.
0 marks The student showed no work (even if the answer is correct) or chose an inappropriate
procedure; the answer is missing or incorrect, or it is correct purely by chance.

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