4 Science 1

1. Spend At least 3-5 min reading question. Take note of important points
2. First task to draw tables and columns. Save time from transferring data when they do experiment later.
3. Collect and record all data from experiment. Process data only after all measurements are taken
4. All students should have sharp pencil, clear ball point pen, calculator and 30 cm long transparent ruler to plot graphs.
5. Gradients need not have units unless question specifically ask for it. Gradient computed to be 3 sf
6. If x starts from zero, y intercept can be read off from graph and to have same accuracy as y values. Y intercept to have same units as y values.
7. If x does not start from zero, y intercept to be computed from y=mx+c. Y intercept to be 3sf in this case and to have same units as y values.
8. Graph to be at least 50 to 75 percent of graph paper.
9. Size of 1 cross (data point) to be size of 1 small graph paper grid.
10. Line of best fit to draw graph (see workbook for explanation of line of best fit)
11. No need to indicate title or scale. Need not start x and y axes from zero unless specified in question.
12. Appropriate scale - Use 2 cm to represent 1,2,5 or 10 units, 10,20,50 or 100 units, 0.1,0.2,0.5 or 1 unit etc.
13. Label x and y axes with units
14. Measured values to follow accuracy of instrument (eg. length measurements to record to 1 decimal place)
15. Computed values to be 3 sf
16. Identify key sources of errors if asked in question
17. Appropriate conclusion for eg- sin i varies linearly with sin r
18. If mistake is made half way through experiment, carry on with experiment if there is no time to redo taking note that a considerable portion of marks are on data processing and graphing.
19.All students should complete all experiments within 20 min so that time can be spent on data processing, graph plotting and conclusion.
20. Raise hand to alert invigilator to mark intermediate step if specified in question
21. Take 5 or 6 readings unless instructed otherwise
 
-Yeti