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O-Level Physical Quantities, Units and Measurement

What the O-Level syllabus expects for Physical Quantities, Units and Measurement, and how to practise it.

What the syllabus expects

Understand that a physical quantity is normally expressed as a numerical value together with a unit.
Recall these base quantities along with their units: mass (kg), length (m), time (s), current (A), temperature (K), amount of substance (mol).
Apply the following prefixes and symbols to represent decimal fractions and multiples of SI units: nano (n), micro (µ), milli (m), centi (c), deci (d), kilo (k), mega (M), giga (G), tera (T).
Appreciate the orders of magnitude for the sizes of familiar objects, spanning from a typical atom up to the Earth.
Choose suitable measuring instruments and justify their use for the quantities listed in the key quantities summary, bearing in mind each instrument's range and precision.
Explain the meaning of scalar and vector quantities and provide everyday examples of both.
Combine two vectors graphically to find their resultant.

About 6% of the past-paper style questions in Rae's bank for this subject sit in this topic.