SI units and prefixes Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. Which of these is an SI base unit?
- A. joule
- B. ohm
- C. ampere
- D. pascal
2. The volume of a block is 2.5 cm³. What is this in m³?
- A. 2.5×10⁻⁶ m³
- B. 2.5×10⁻² m³
- C. 2.5×10⁻³ m³
- D. 2.5×10⁶ m³
3. A device of power 800 W runs for 30 minutes. How much energy does it transfer in kW h?
- A. 24 kW h
- B. 0.40 kW h
- C. 0.80 kW h
- D. 400 kW h
4. An electron is accelerated through a potential difference and gains 3.2×10⁻¹⁵ J. What is this energy in keV?
- A. 20 keV
- B. 2.0×10⁴ keV
- C. 0.020 keV
- D. 5.1 keV
5. Which gives the unit of potential difference, the volt, in SI base units?
- A. kg m² s⁻² A⁻¹
- B. kg m² s⁻³ A⁻¹
- C. kg m s⁻³ A⁻¹
- D. kg m² s⁻³ A