SI Units and Unit Conversions: Quiz

SI Units and Unit Conversions: Quiz

7 questions

1. Question 1EasyWhich is an SI base unit?

   AlitreBgramCkelvinDdegree Celsius
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   Answer: kelvin

   The SI base unit of temperature is the kelvin. The base unit of mass is the kilogram (not the gram); the litre and °C are accepted but not base units.

2. Question 2EasyWhat is 2.5 km in metres?

   A0.0025 mB250 mC2500 mD25 000 m
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   Answer: 2500 m

   2.5 km × (1000 m / 1 km) = 2500 m (or 2.5 × 10³ m). The km units cancel.

3. Question 3EasyWhat is 45 mg in grams?

   A0.045 gB0.45 gC4.5 gD45 000 g
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   Answer: 0.045 g

   45 mg × (1 g / 1000 mg) = 0.045 g. The mg units cancel.

4. Question 4MediumHow many cubic centimetres are in 1 m³?

   A100 cm³B1000 cm³C10 000 cm³D1 000 000 cm³
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   Answer: 1 000 000 cm³

   1 m = 100 cm, so 1 m³ = (100 cm)³ = 1 000 000 cm³ (10⁶ cm³). The factor must be cubed.

5. Question 5MediumWhich setup correctly converts 350 mL to L?

   A350 mL × (1000 mL / 1 L)B350 mL × (1 L / 1000 mL)C350 mL ÷ (1 L / 1000 mL)D350 mL × (1 L / 100 mL)
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   Answer: 350 mL × (1 L / 1000 mL)

   mL must be in the denominator to cancel, leaving L: 350 mL × (1 L / 1000 mL) = 0.350 L.

6. Question 6MediumA car travels at 72 km/h. What is this in m/s?

   A20 m/sB259 m/sC1.2 m/sD72 000 m/s
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   Answer: 20 m/s

   72 km/h × (1000 m / 1 km) × (1 h / 3600 s) = 20 m/s. Both km and h cancel.

7. Question 7HardMercury has a density of 13.6 g/mL. What volume does 68.0 g of mercury occupy?

   A5.00 mLB925 mLC0.200 mLD54.4 mL
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   Answer: 5.00 mL

   68.0 g × (1 mL / 13.6 g) = 5.00 mL. The density is flipped so that g cancels.