IGCSE Practical COMMAND WORDS

Learn the meanings of these words to fully understand what the questions are asking you to do, this will maximise marks and ensure less time is wasted on long winded answers that are focused on the wrong things!

Also added some good exam practise for those graphs and conclusion Qs

hope it helps

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  • Created by: Ruby C
  • Created on: 29-04-12 20:04

PRECISE

How SMALL a measurement is to be precise.

e.g mm more precise than cm because more units to measure to a degree of accuracy- because smalller.

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Accuracy

how close a measurement is to TRUE VALUE

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RELIABLE

if repeated results will be the same

repeat measurements check reliability of results

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Fair TEST

ONLY INDEPENDENT variable effects the DEPENDENT V.

ONLY CHANGE Independent variable keep everything else SAME

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GRAPHS + TABLES

Tables = I.D   first column independent variable ... second column Dependent variable

Graphs- how to plot

S cale - in 10s 2s?....

L ine - best fit? curve? not joint?

A xes- x = Independent v   y= Dependent

P lot - how accurate its done so make sure you read the table of results carfully and   

            covered all of the results on the graph unless told otherwise

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Controlled Variable

Things kept same = fair test

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VALIDITY / VALID

results need to be valid to get conclusions - remove anomolies + repeat

REsults can be VALID by conducting a FAIR TEST

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Practical experiment LAYOUT

C ompare - 50cm 10 cm etc INDEPENDENT VARIABLE

O ganisim - human? lady bug?.... same gender height weight

R peat- repeat to make accurate

M asure/ method

S me - what you will keep the same to make fair test!

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