Practice PIEAS ICS questions with answers and explanations.
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Multiply numerators and denominators, then simplify.
(3 × 10)/(5 × 9) = 30/45 = 2/3.
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One kilometre equals 1,000 metres.
Therefore 3.5 km = 3.5×1,000 = 3,500 m.
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Dividing by a fraction means multiplying by its reciprocal.
Thus, 4/7 × 3/2 = 12/14 = 6/7.
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One metre equals 100 centimetres.
Therefore 250 cm ÷ 100 = 2.5 m.
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The metre is the SI base unit of length.
Other metric length units are derived from it using prefixes.
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The kilogram is the SI base unit of mass.
The gram is one-thousandth of a kilogram.
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The second is the SI base unit of time.
Minutes and hours are accepted non-SI units derived from it.
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A scalar has magnitude only.
Speed has no associated direction.
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A vector has both magnitude and direction.
Acceleration describes the rate and direction of velocity change.
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Both sides of a valid physical equation must have the same dimensions.
Dimensional analysis can reveal inconsistent formulas.
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The newton is derived from base units as kg·m/s².
Metre, kilogram, and second are base units.
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Precision describes repeatability.
Measurements can be precise without being accurate.
