In my graduation thesis we will investigate experimental task from the 39th National Competition in Physics for Stefan awards, which was held on April 6th 2019 and which was given to pupils of 9th grade. In the first part we will get a good look at history of physics competitions in Slovenia. We will also present this year's State competition. In the second part of the thesis we will present and analyse the experimental problem and examine the answers of the pupils, to find out what common errors they made. We will try to find out what caused those errors. In the last part I will grade experimental task and compare my own results with official results to check reliability of graders and if instructions for graders provided objectivity of grading.
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