AQA A Level physics measurements and their errors questions with verified answers graded A+

AQA A Level physics measurements and
their errors questions with verified
answers graded A+
What is a random error? - correct answers-Errors in measurements when the values differ from the
actual value by different magnitudes and directions

What is a systematic error? - correct answers-Errors in measurement when the values differ from the
true value by a fixed value in the same direction

Precision - correct answers-How closely the results of an experiment agree with each other

Repeatability - correct answers-If it can be repeated with the same equipment and achieve the same
results

Resolution - correct answers-The smallest change in the quantity being measured that gives a
perceptible change in a reading on a measuring instrument

Accuracy - correct answers-A measure of how close the results of an experiment are to the true value

Absolute uncertainty - correct answers-The size of the range of values in which the 'true value' probably
lies

fractional/percentage uncertainty - correct answers-Absolute uncertainty divided by measured value
times 100 so as percentage

C.U. Adding values - correct answers-a + b = c add absolute uncertainties

C.U. Multiplying values - correct answers-a x b = c add percentage uncertainties

C.U. Dividing values - correct answers-a / b = c add percentage uncertainties

C.U. Power rules - correct answers-a = b^c multiply percentage uncertainty by power