SI Base Units Quiz

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Questions and Answers

What is a base unit of measurement?

  • A unit for a derived quantity
  • A unit fraction of a given unit
  • An integer multiple of a given unit
  • A unit of measurement adopted for a base quantity (correct)

What are the SI base units?

  • Metre, kilogram, minute, ampere, kelvin, mole, and candela
  • Gram, liter, second, watt, joule, mole, and candela
  • Metre, kilogram, second, ampere, kelvin, mole, and candela (correct)
  • Metre, gram, second, ampere, kelvin, mole, and lumen

What is a unit multiple?

  • A unit for a derived quantity
  • A unit fraction of a given unit
  • A unit of measurement adopted for a base quantity
  • An integer multiple of a given unit (correct)

What is a derived unit?

<p>A unit for a derived quantity, involving the combination of quantities with different units (B)</p> Signup and view all the answers

What is a coherent derived unit?

<p>Involves no conversion factors (C)</p> Signup and view all the answers

Which of the following is a base quantity according to the text?

<p>Time (D)</p> Signup and view all the answers

What is the SI unit for measuring temperature?

<p>Kelvin (C)</p> Signup and view all the answers

Which of the following is a derived unit according to the text?

<p>Newton (D)</p> Signup and view all the answers

What are unit prefixes commonly based on?

<p>Base-10 or base-2 powers (C)</p> Signup and view all the answers

What is a unit submultiple according to the text?

<p>A submultiple or a unit fraction of a given unit (C)</p> Signup and view all the answers

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Study Notes

Base Units and Measurement

  • A base unit of measurement is a standard unit of measurement in a system of units.

SI Base Units

  • There are seven SI base units, which are the foundation of the International System of Units (SI).
  • The seven SI base units are:
  • Meter (m) for length
  • Kilogram (kg) for mass
  • Second (s) for time
  • Kelvin (K) for thermodynamic temperature
  • Ampere (A) for electric current
  • Mole (mol) for amount of substance
  • Candela (cd) for luminous intensity

Unit Multiples and Submultiples

  • A unit multiple is a unit that is a multiple of a base unit, formed by prefixing a multiplier to the base unit.
  • A unit submultiple is a unit that is a fraction of a base unit, formed by prefixing a submultiple to the base unit.

Derived Units

  • A derived unit is a unit that is derived from base units, used to express quantities that are not covered by the base units.
  • A coherent derived unit is a derived unit formed by combining base units according to the laws of physics, without any numerical factor.

Base Quantities

  • Base quantities are physical quantities that cannot be expressed in terms of other quantities, such as length, mass, time, and temperature.

SI Units for Temperature

  • The SI unit for measuring temperature is the Kelvin (K).

Derived Units Examples

  • Examples of derived units include velocity (m/s), force (N), and energy (J).

Unit Prefixes

  • Unit prefixes are commonly based on powers of 10, such as kilo- (10^3) and centi- (10^-2).

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