Physics · Oct / Nov 2023 · Paper 61 · Question 4
0625
As printed in the paper
The question as text
A student investigates the time taken for water to evaporate to dryness when heated from above. Fig. 4.1 shows the set-up. The power of the heater is constant. The following is also available: • supply of water at room temperature • metre ruler. infrared heater shallow dish water lead to power supply Fig. 4.1 Plan an experiment to investigate how one factor affects the time taken for the water to evaporate. You do not need to write about safety precautions. You should: • state any additional apparatus required • explain briefly how you would do the investigation • state the key variables that you would keep constant • draw a table, or tables, with column headings, to show how you would display your readings (you are not required to enter any readings in the table) • explain how you would use your readings to reach a conclusion.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
MP1
(stop)watch / clock / timer / chronometer
MP2
Measure / record time for evaporation / for water to disappear / for dish to become dry.
MP3
Repeat with a different volume / depth of water
OR different distance of heater from water / different height of heater
MP4
One from:
Volume / depth of water (if not chosen variable)
OR Height / distance of heater from water (if not chosen variable)
MP5
One from:
Room temperature / (initial) water temperature
Reference to avoiding draughts owtte
Surface area of water
Second variable from MP4 if wrong investigation
MP6
Table with clear columns for time and chosen variable with appropriate units. These must be headed with both a quantity (or a recognised symbol for it) and unit.
MP7
Plot graph of chosen variable against time
OR an answer which suggests comparing values of chosen variable and time in table
Additional graph notes:
NOTE: – The principle to apply here is ‘could I draw a significantly better line, using these points, under examination conditions?’ If the answer is definitely ‘yes’, do not award the mark.
NOTE: –
If candidate’s scale consists of actual readings at equal intervals this will produce a perfect straight line! The only marks available in this case are the first (axes right way round and labelled) So maximum 1.
If axes are wrong way round, the other 3 marks are still available.
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