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The following physics revision questions are provided in support of the physics tutorial on Units. Systems of Units. Fundamental and Derived SI Units. In addition to this tutorial, we also provide revision notes, a video tutorial, revision questions on this page (which allow you to check your understanding of the topic) and calculators which provide full, step by step calculations for each of the formula in the Units. Systems of Units. Fundamental and Derived SI Units tutorials. The Units. Systems of Units. Fundamental and Derived SI Units calculators are particularly useful for ensuring your step-by-step calculations are correct as well as ensuring your final result is accurate.

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Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
---|---|---|---|---|---|---|

1.1 | Units. Systems of Units. Fundamental and Derived SI Units |

- Metre, kilogram, newton, second
- Ampere, Celsius degree, square metre, candela
- Mole, second, gram, metre
- Ampere, kilogram, candela, mole

**Correct Answer: D**

- There are 7 fundamental and an undefined number of derived SI units used in science
- All fundamental SI units are related to their multiples or submultiples by powers of ten
- The unit of force is a fundamental SI unit
- Derived units are obtained when two or more different fundamental SI units are combined with each other

**Correct Answer: A**

Clarification: Every year scientist make new discoveries in science and, since each new physical quantity discovered has its own definition and unit, there is an undefined number of derived SI units in science. Also, derived units are not obtained only when two or more different units are combined together; they also exist even if we use the same unit more than once, such is the case of surface area or volume.

- 79.0 kg
- 79.3 kg
- 79.1 kg
- 84.4 kg

**Correct Answer: B**

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The following Physics Calculators are provided in support of the Units and Measurements tutorials.

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