What two components make up all physical quantities?
A numerical magnitude and a unit.
What is the internationally used system of measurement?
The SI units (Système Internationale).
Name three SI base quantities and their units.
Mass (kg), Length (m), and Time (s). (Other correct answers include Electric current (A), Temperature (K), Amount of substance (mol), and Luminous intensity (cd).)
What is the purpose of prefixes like ‘kilo’ or ‘milli’?
To indicate decimal multiples or submultiples of a unit.
What are derived units?
Units that are a combination of base units.
What is homogeneity used for?
To check if each term in an equation has the same base units to determine if the equation is valid.
What is the difference between systematic errors and random errors?
Systematic errors are consistent or predictable, while random errors cause unpredictable variations.
Define accuracy in simple terms.
The closeness of a measurement to the true value.
What does precision refer to?
The closeness of repeated measurements to each other.
What is uncertainty?
The range of values within which a measurement is likely to lie.
What do significant figures in a measurement indicate?
Its uncertainty.
What is the main difference between a scalar quantity and a vector quantity?
A scalar has only magnitude, while a vector has both magnitude and direction.
Give one example of a scalar quantity from the module.
Mass. (Other correct answers include time and temperature.)
Give one example of a vector quantity from the module.
Velocity. (Other correct answers include force and acceleration.)
