Practical based skills

Question 1

Independent variable

Answer 1

This is the variable that you change

Question 2

Dependent variable

Answer 2

This is the variable that you measure

Question 3

Control variables

Answer 3

These are variables that we keep the same

Question 4

Repeatable

Answer 4

Taking the experiment more than once and comparing the data using the same group of people and methods.

Question 5

Reproducible

Answer 5

Comparing data of different groups using the same or different methods

Question 6

Precision of equipment

Answer 6

This is the minimal interval of measurement. The smaller the interval, the higher the resolution. Therefore, this means that the degree of precision is higher e.g) a thermometer reading to 1 degrees Celsius is less precise than a thermometer reading to 0.5 degrees Celsius.

Question 7

Accuracy

Answer 7

How close the data is to the true value. Experiments are repeated to identify anomalies and calculate the mean.

Question 8

True value

Answer 8

The value with no error

Question 9

Automated equipment:

Answer 9

e.g) temperature sensors which may have a higher degree of precision and accuracy. Also removes random error due to misreading a thermometer.

Question 10

Metal properties:

Answer 10

1) Tend to have high boiling and melting points.
2) Tend to be good conductors of heat
3) Good conductors of electricity
4) Metals in solid form vibrate when met with force