Prefixes, derived units and unit conversion

Overview

Recall questions on Prefixes, derived units and unit conversion.

What you need to know

Answer each one before you reveal it.

Questions from this subtopic

Each one with the model answer underneath.

1. 1

   Name the prefixes standing for 10⁻¹², 10⁻⁹, 10⁻⁶ and 10⁻³, and give the symbol of each.

   Model answer

   They are pico (p), nano (n), micro (μ) and milli (m).

2. 2

   Name the prefixes standing for 10³, 10⁶, 10⁹ and 10¹², and give the symbol of each.

   Model answer

   They are kilo (k), mega (M), giga (G) and tera (T).

3. 3

   Write a wavelength of 45 μm in metres in standard form.

   Model answer

   It is 4.5 × 10⁻⁵ m.

4. 4

   Rewrite a time interval of 2.4 × 10⁻⁷ s using a suitable prefix.

   Model answer

   It is 240 ns.

5. 5

   Convert an area of 250 cm² into square metres.

   Model answer

   One square centimetre is 10⁻⁴ m², so 250 cm² is 2.5 × 10⁻² m².

6. 6

   A brick has a volume of 1400 cm³. Express that volume in cubic metres.

   Model answer

   One cubic centimetre is 10⁻⁶ m³, so the volume is 1.4 × 10⁻³ m³.

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