OCR 2023 GCSE Combined Science B Twenty First Century Science J260/08: Combined science (Higher Tier) Question Paper & Mark Scheme (Merged)

Two students are doing an experiment to investigate reaction times. The diagram shows their experiment. Tester Participant (a) The statements outline the method used. They are not in the correct order. (i) Write the letters in the boxes to show the correct order of the statements. The first one has been done for you. E [2] (ii) Suggest two improvements to the method that would ensure that the measurements taken were valid. Improvement 1 .................................................................................................................. ........................................................................................................................................... Improvement 2 .................................................................................................................. ........................................................................................................................................... [2] 3 © OCR 2023 Turn over (b) The experiment is repeated three times. Table 1.1 shows the results. Table 1.1 Repeat Distance ruler falls (cm) 1 8.4 2 7.9 3 7.7 The students conduct a fourth repeat. The distance recorded is 12.7cm. Suggest one reason why this value of 12.7cm is greater than the first three repeats. ................................................................................................................................................... ...........................................................................................................................................[1] (c) The students find some data they can use to convert the distance fallen by the ruler into a reaction time. This information is in Table 1.2. Table 1.