GCSE-Experimental

Question 1

The experimental variable that you directly change is called the …?… variable.

Answer 1

independent

Question 2

The experimental variable that you expect to change as a result of any change you make in the independent variable is called the …?… variable

Answer 2

dependent

Question 3

Any experimental variable that you keep constant during the experiment to prevent it influencing the results is called a …?… variable

Answer 3

controlled

Question 4

An experiment that truly tests your hypothesis is …?

Answer 4

valid

Question 5

If your results are repeatable and they provide strong evidence for your conclusion then your results are …?

Answer 5

reliable

Question 6

For results to be reliable they will need to cover a …?… enough range.

Answer 6

wide

Question 7

Increasing the number of results will …?… the reliability

Answer 7

increase

Question 8

Repeating measurements will increase their …?

Answer 8

reliability

Question 9

Repeated measurements that are clumped around the true value of the variable are …?

Answer 9

accurate

Question 10

Repeated measurements that are close to each other are …?

Answer 10

precise

Question 11

If the dependent variable is always equal to the independent variable multiplied by some constant then the variables are …??

Answer 11

directly proportional

Question 12

If two variables (x and y) are directly proportional then a graph of one plotted against the other will be a …?????

Answer 12

straight line through the origin

Question 13

If two variables (x and y) are directly proportional then one divided by the other will always approximately equal a …?

Answer 13

constant

Question 14

When repeated measurements are equally spread above and below the true value the uncertainty is …?

Answer 14

random

Question 15

When repeated measurements are either all above or all below the true value the uncertainty is …

Answer 15

systematic

Question 16

If two variables (x and y) are indirectly proportional then a graph of one plotted against the other will be a …?????

Answer 16

1/x type curve in which y decreases as x increases

Question 17

If two variables (x and y) are indirectly proportional then a graph y plotted against 1/x will be a …?????

Answer 17

straight line through the origin.

Question 18

If two variables (x and y) are indirectly proportional then a constant will be obtained by… ? …y by x.

Answer 18

multiplying

Question 19

If two variables (x and y) are indirectly proportional then the equation connecting them is …

Answer 19

y = k/x

Question 20

If two variables (x and y) are directly proportional then the equation connecting them is…

Answer 20

y = kx

Question 21

If two variables (x and y) are directly proportional then a constant is obtained by …?… y by x

Answer 21

dividing

Question 22

If two variables (x and y) are directly proportional then the constant of proportionality equals the …?… of a graph of y against x.

Answer 22

gradient

Question 23

If two variables (x and y) are indirectly proportional then the gradient of a graph of y against 1/x equals…????

Answer 23

the constant of proportionality

Question 24

An anomalous result is one which …

Answer 24

doesn’t fit in with the pattern of the other results.

Question 25

How would you deal with an anomalous result if you still have access to the experimental apparatus?

Answer 25

Repeat the measurement.

Question 26

How would you deal with an anomalous result if you do not have access to the experimental apparatus?

Answer 26

Ignore it when plotting a best-fit graph line or calculating a mean. In your evaluation, explain why you ignored it and suggest possible causes for the anomaly.