detector building c – results - scioly.org

DETECTOR BUILDING C – RESULTS UT SCIENCE OLYMPIAD INVITATIONAL TOURNAMENT 2021

NOTES

1 This document is a results summary of the Detector Building event at the UT Invitational hosted from October 23-24, 2020, by students at the University of Texas at Austin. This tournament was run in mini SO format with testing conducted via the Scilympiad platform. As such, many questions of the test were structured and/or worded for the online format.

2 The test for this event was written by Abhi Dhir, a student at the University of Texas at Austin; Ryan Anselm, a student at the University of Texas at Austin; and George Sun, a graduate of the University of Washington in Seattle.

3 The details in this report have been released to the public with the express permission of ATX Science Olympiad.

TOPIC BREAKDOWN

Topic Questions Points Percentage

i. Relationships between resistance, voltage, and temperature

1, 24, 25, 27, 28, 29, 31, 32, 49, 50, 51, 52, 53, 54, 55

55.00 25%

ii. Theory of LEDs, working principles, and applications 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23

63.50 29%

iii. The process of calibration - working with raw data and determining real world relationships

30, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48 56.00 25%

iv. Operational knowledge of basic Device components 2, 3, 14, 26, 33, 34, 35, 36, 37, 40 47.50 21%

SCORING METHODOLOGY

Fill in the Blank: All fill-in-the-blank questions were manually regraded with points awarded without penalty for misspelled answers. For some questions, points were awarded for similar answers. Responses were penalized if instructions were not followed, e.g. not rounding numbers as requested, including units when told not to, answering with more words than requested. Multiple Answer: All multiple answer questions were regraded such that a proportionate fraction of the points possible were awarded for each answer choice response that matched the key, e.g. for a five point question with five answer choices, one point was awarded for each choice correctly selected and one point was awarded for each choice correctly not selected. Note this is different from Scilympiad’s default scoring for this question type. Short Answer: The three short answer questions on the test were graded by three graders, each grading all responses to the particular question they were assigned. After scoring all responses to their question, each grader reviewed their grading for consistency. Multiple Choice and True/False: Multiple choice and true/false questions were graded for exact matches; no partial credit was awarded for these questions. Tiebreakers: Tiebreaker questions were included in each team’s total score. The questions selected for tiebreakers were identified on the test made available to students. In the event of a tie, a comparison of the scores from each of these tiebreakers was used in order until the tie was broken.

RESULTS SUMMARY

Submitted: 92/117 Possible Points: 222 Average: 83.2 Minimum: 25.5 Maximum: 161 A histogram of total scores, line plot of scores by rank, bar graph of percentage points earned for question on average, and statistics for each question are included starting on the following page.

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DETECTOR BUILDING C: UT SCIENCE OLYMPIAD INVITATIONAL TOURNAMENT 2021 2

RESULTS SUMMARY (CONTINUED)

The histogram and line plot below show the distribution of total scores and total score vs. rank, respectively.

The bar graph below shows the percentage of possible points earned on average for each question, which can be used as an indication for which questions were most difficult for students. Note that two questions, 22 and 44, were not graded and all teams received no points for these.

RESULTS BY QUESTION

Question Comments Statistics

1 Fill in the Blank

This question involves a basic calculation for what value of resistor should be paired with an LED given its voltage requirements, one every team should have completed in the process of building their device. A common wrong answer was 160 ohms, the resistance of a resistor with a voltage drop of 3.2 V; however, the question specifies this voltage is for the LED. One point was awarded for responses off by magnitudes of ten, and two points were awarded for correct answers rounded incorrectly or including units.

Answered: 90/92 Possible: 3 Average: 1.3 Minimum: 0 Maximum: 3

2 Fill in the Blank

Answering this question correctly required a correct answer to the previous question. Partial credit was awarded for partially correct answers regardless of correctness of response to the previous question.

Answered: 85/92 Possible: 1.5 Average: 0.7 Minimum: 0 Maximum: 1.5

Distribution of Total Scores

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RESULTS BY QUESTION (CONTINUED)


3 Multiple Answers

Correct answer(s): C, D Incorrect answer(s): A, B, E

Answered: 91/92 Possible: 7.5 Average: 5.6 Minimum: 1.5 Maximum: 7.5

4 Fill in the Blank

Almost all teams answered this question correctly. Misspelled responses were still awarded points without penalty.


5 Multiple Choice

Correct answer: B Answered: 92/92 Possible: 2 Average: 1.3 Minimum: 0 Maximum: 2

6 Multiple Choice

Correct answer: E Answered: 92/92 Possible: 4 Average: 1.8 Minimum: 0 Maximum: 4

7 Multiple Choice


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8 Multiple Choice


9 Multiple Choice


10 Multiple Choice

Correct answer: A Answered: 91/92 Possible: 1 Average: 0.7 Minimum: 0 Maximum: 1

11 Multiple Choice


12 Multiple Choice

Correct answer: C Answered: 89/92 Possible: 1 Average: 0.5 Minimum: 0 Maximum: 1

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13 Multiple Choice

Correct answer: D Answered: 88/92 Possible: 1 Average: 0.5 Minimum: 0 Maximum: 1

14 Multiple Choice


15 Fill in the Blank


16 Multiple Answers

Correct answer(s): A, E Incorrect answer(s): B, C, D, F

Answered: 90/92 Possible: 3 Average: 1.4 Minimum: 0.5 Maximum: 3


Full points were awarded for responses of 360 or 370. Responses that included units or did not round to two significant figures were penalized one point.


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18 Multiple Choice


19 Short Answer

Many responses focused on the effect on the connections or each region but did not relate this back to the effect on the depletion region.




21 Multiple Choice



This question was not graded and all teams received zero points.


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23 Multiple Answers

Correct answer(s): B, C, D Incorrect answer(s): A, E, F



Full points were awarded for responses of 80 or 81. Other responses near these numbers were awarded one point. Responses that included units or did not round to the nearest degree were penalized one point.


25 Multiple Answers

Correct answer(s): A, C, D Incorrect answer(s): B, E, F


26 Short Answer

Most students understood how frequency affected rate and were able to explain two of the three factors. The most common mistake was thinking that the temperature of the room affected rate.


27 Multiple Choice


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Misspelled responses were still awarded points without penalty. Responses that included two words were penalized one point. “Thermoelectric” was a common incorrect answer and was awarded one point.


29 Multiple Choice


30 Multiple Answers

Correct answer(s): A, D Incorrect answer(s): B, C, E


31 True/False

Correct answer: False Answered: 90/92 Possible: 2 Average: 1.1 Minimum: 0 Maximum: 2

32 Multiple Choice


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33 Multiple Choice


34 Multiple Choice


35 Multiple Choice


36 Multiple Answers

Correct answer(s): A, E Incorrect answer(s): B, C, D




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A handful of teams responded with the lower and upper bounds, and were awarded full points if both numbers were correct or half points if only one number was correct. Responses that did not round to the nearest degree were penalized one point.




40 Multiple Answers

Correct answer(s): A, D Incorrect answer(s): B, C, E, F


41 Short Answer

Most responses correctly mentioned improving accuracy by collecting more data points or by calibrating measurement equipment (the thermometer and/or ohmmeter) to accepted values.


42 Multiple Choice


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43 Multiple Choice



This question was not graded and all teams received zero points.


45 True/False

Correct answer: False Answered: 91/92 Possible: 2 Average: 0.6 Minimum: 0 Maximum: 2

46 Multiple Answers

Correct answer(s): B, D Incorrect answer(s): A, C, E


47 Multiple Answers

Correct answer(s): B Incorrect answer(s): A, C, D, E


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48 Multiple Answers

Correct answer(s): A, B Incorrect answer(s): C, D, E


49 Multiple Choice



Variants of the correct answer (e.g. potential divider) and misspelled responses were awarded full points without penalty. “Thermistor” was a common response, which was awarded one point.




52 True/False

Correct answer: True Answered: 90/92 Possible: 2 Average: 1.7 Minimum: 0 Maximum: 2

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