Topic 1.2: Measurement and Uncertainties

Question 1

• 1.2.1: State the fundamental units in the SI system.

Answer 1

o	Kilogram
o	Meter
o	Second
o	Ampere
o	Mole
o	kelvin

Question 2

Distinguish between precision and accuracy

Answer 2

o Accuracy refers to the closeness of a measured value to a standard or known value.
o Precision refers to the closeness of two or more measurements to each other.

Question 3

Determine the uncertainties in results

o In addition and subtraction

Answer 3

 Add absolute uncertainties

Question 4

Determine the uncertainties in results o For multiplication, division, and exponents

Answer 4

 Add percentage uncertainties

Question 5

Determine the uncertainties in results o For other functions

Answer 5

 Obtain uncertainty range (subtract highest answer from lowest)