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# QCP 522 Teaching of Physics III - PowerPoint PPT Presentation

QCP 522 Teaching of Physics III. Marking Scheme & Evaluating Students’ Answers. Key Areas …. Constructing a marking scheme Evaluating students’ answers. Constructing Marking Scheme. Marking Scheme. Shows answers Shows how marks are distributed specifically

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### QCP 522 Teaching of Physics III

Marking Scheme &

• Constructing a marking scheme

### Constructing Marking Scheme

• Shows how marks are distributed specifically

• Should be as objective as possible to minimise variation that might result from differences in interpretation

• Must accommodate all correct responses to a question

• Should be written before paper is administered and happens at the same time as questions are set

• Decide on guidelines which inform how marks will be awarded

Basic Codes for Mark Allocation (as used in GCE exams)

Two 4.0 Ω resistors are connected in series to a 12 V battery. Calculate:

• the total resistance of the circuit,

• the current supplied by the battery.

R1 + R2 or 4.0 + 4.0 C1

= 8.0 Ω A1

V = IR in any symbolic form C1

12/8 C1

1.5 A A1

(i) 4.0 + 4.0

= 8.0 Ω

(ii) 12/8

= 1.5 A

(i) 4.0 + 4.0 = 8.0 Ω

(ii) 1.5 A

(i) 1/4 + 1/4 = ½

R = 2.0 Ω

(ii) I = V/R

= 12/2

= 6.0 A

(i) 1/4 + 1/4 = ½

R = 2.0 Ω

(ii) I = V/R

= 12 / 2

= 1.5 A

(i) 1/4 + 1/4 = ½

R = 2.0 Ω

(ii) I = VR

= 12/2

= 6.0 A

(i) 1/4 + 1/4 = ½

R = 2.0 Ω

(ii) I = 6.0 A

• Wrong answer because of arithmetic error will lose one mark (the final A mark).

• This can arise from errors due to

• Factors of ten (e.g., mistaking 109 for x104)

• Misunderstanding SI prefixes (e.g., kg instead of g)

• Does NOT apply where a factor of ten arises due to conceptual errors

• E.g., W = m/g or m = 20 N

• Answers to be given to at least two significant figures, unless specifically stated on the mark scheme.

• Example 1: R = 4.0 + 4.0 = 8 Ω

• Example 2: R = 8 + 1.1 = 9.1 Ω

• Example 3: I = 12/8 = 2 C or 1.5 mJ or 0.7 A

Wrong s.f

Correct coz 8 is exact

Sample Question C

### Activity 1

Constructing Marking Scheme

• Setting a standard

• Alteration of marking scheme to alter the difficulty/ease of paper without changing questions

• Deciding what is acceptable and what is not (not just about what is right or wrong)

• Norm reference vs critierion reference

• Reliable and discriminating assessment

• Identifying which grade rank students can score the mark

• Other consideration

### Activity 2

Some pointers to take note when marking papers

• Consistency in marking

• Assess students’ understanding (what’s the tolerance level)

• Fairness

Give students enough information before assessing them

• Time/date

• Content areas

• Assessment conditions (duration, no. of test items, closed/open book)

• Types of test items (where’s the emphasis?)

• Weightage of different components

• Give opportunity to practice expected performance

• Clarify scoring of test

• How test results will be used

• Guidelines for constructing marking scheme

• Considerations for evaluating students’ answers

• Preparing students for test

Part I: Constructing test paper should

• Be based on one topic in the physics syllabus

• Have a time frame of 45 minutes

• Have a total of 30 marks

• Consist of 10 MCQs (10 marks), two structured questions (Section A type questions: 10 marks total) and one “longer” structured w/free response question or data-based question (Section B type questions: 10 marks)

• Be complete with TOS and marking scheme

• State topic, class level, ability group (in TOS)

Part II: Provide justification for

• Choice of distractors for multiple-choice questions: Choose three MCQs from the test paper and provide justifications for the choice of the distractors.

• Choice of questions for one short “structured” question: Choose one of the two short-answer questions. Explain your choice of question(s). You may provide make reference to the other questions of the paper in your justification.

• Marking scheme for the longer “structured” /free response question: Provide justification for the detailed mark allocation for each part of the free response question.

Submit softcopy through BB (Safe Assignment)

• What is the basis that help you decide on the choice of distractors?

You may want to refer to the guidelines for choosing distractors. (e.g., http://www.utexas.edu/academic/diia/assessment/iar/students/plan/method/exams-mchoice-write.php)

You may wish to explain your choice of question in terms of:

• Content (single or integrated)

• Context (real vs decontextualized)

• Mode of representation (text, graph, table, diagram, etc)

• Number/theme of sections/sub-sections

• Progression of questions

• Tasks (standard and degree of difficulty)

• Wording (if applicable)

You may need to refer to the other questions for some of the above issues.

You may wish to explain how you decide on the marking scheme:

• Maintaining standard (what is acceptable or not)

• Balancing norm/criterion reference (discrimination)

• Other issues (time/difficulty/magnitude)