IGCSE Core Practical Keywords

What is the independent variable?

• The variable you measure

• The variable you change

• The variable you keep the same

How do you ensure an experiment is a fair test?

• Repeat the experiment

• Control variables

• Make sure the experiment is reproducible

• Use apparatus with a high resolution

What piece of apparatus is this? (one word answer)

A result is accurate if...

• There are no random errors

• There is little spread about the mean value

• It is close to the true value

What is the control variable?

• The variable you measure

• The variable you change

• The variable you keep the same

What piece of apparatus is this?

• Crucible

• Heating basin

• Evaporating dish

• Bowl

When is an experiment reproducible?

• If the same scientist repeats the experiment and gets a different result

• If a different scientist repeats the experiment and gets a different result

• If the same scientist repeats the experiment and gets the same result

• If a different scientist repeats the experiment and gets the same result

What is the dependent variable?

• The variable you measure

• The variable you change

• The variable you keep the same

What resolution does this measuring cylinder have?

• 1 ml

• 5 ml

• 10 ml

• 100 ml

How can random error be reduced?

• Taking more measurements

• Controlling variables

• Calculating a mean

• Reducing resolution