Practical skills at A level

Question 1

Independent variable

Answer 1

the quantity in an experiment that is altered by the experimenter

Question 2

Dependent variable

Answer 2

the quantity that is being measured and which changes as the independent variable is altered by the experimenter

Question 3

Control variable

Answer 3

a quantity that has to be kept constant, otherwise the relationship between the other variables is not tested fairly

Question 4

Uncertainty

Answer 4

an estimate of the spread of values around a measured quantity within which the true value will be found

Question 5

Worst acceptable line

Answer 5

either the steepest possible line or shallowest possible line that passes through the error bars of all the points