Worksheet: SI Unit Definitions

In this worksheet, we will practice recognising the units of the SI unit system and the physical quantities that it is used to measure.

Q1:

Which of the following most correctly describes the difference between fundamental and derived physical quantities?

  • AFundamental quantities can have more than one unit, but derived quantities can only have one unit.
  • BDerived quantities can have more than one unit, but fundamental quantities can only have one unit.
  • CFundamental quantities can be defined in terms of derived quantities.
  • DDerived quantities can be defined in terms of fundamental quantities.
  • EFundamental quantities were proposed before derived quantities were proposed.

Q2:

Which of the following physical quantities has the SI unit mole?

  • AVolume
  • BMass
  • CEnergy
  • DAmount of substance
  • EDensity

Q3:

Which of the following physical quantities has the SI unit candela?

  • ARadiant intensity
  • BRadiant flux
  • CLuminous flux
  • DIrradiance
  • ELuminous intensity

Q4:

Which of the following SI units is defined as being equal to 1,650,763.73 wavelengths of the red-orange light emitted in a vacuum by atoms of krypton-86?

  • AThe candela
  • BThe steradian
  • CThe mole
  • DThe second
  • EThe meter

Q5:

Which of the following SI units is defined by reference to the properties of a unique, standard object held at the International Bureau of Weights and Measures?

  • AThe meter
  • BThe kilogram
  • CThe steradian
  • DThe candela
  • EThe mole

Q6:

Which of the following is the symbol for the SI unit of absolute temperature?

  • AC
  • B
  • CF
  • DK
  • EC

Q7:

Which of the following SI units is defined as being equal to the interval in which atoms of cesium-133 emit 9,192,631,700 waves?

  • AThe candela
  • BThe mole
  • CThe second
  • DThe meter
  • EThe steradian

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