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Questions and Answers
What is the unit of mass in the SI system?
What is the unit of mass in the SI system?
- Ampere
- Kilogram (correct)
- Metre
- Second
The unit of temperature in the SI system is Celsius.
The unit of temperature in the SI system is Celsius.
False (B)
What is the symbol for electric current in the SI system?
What is the symbol for electric current in the SI system?
I
The unit of pressure in the SI system is the ______.
The unit of pressure in the SI system is the ______.
Match the following prefixes with their corresponding powers of ten:
Match the following prefixes with their corresponding powers of ten:
What is the SI derived unit for force?
What is the SI derived unit for force?
Which SI unit is used to measure volume?
Which SI unit is used to measure volume?
There are only seven base quantities in the SI system.
There are only seven base quantities in the SI system.
What is the derived unit for energy in the SI system?
What is the derived unit for energy in the SI system?
The unit for luminous intensity is the ampere.
The unit for luminous intensity is the ampere.
What is the symbol for the unit of volume?
What is the symbol for the unit of volume?
The SI unit for temperature is the ______.
The SI unit for temperature is the ______.
Match the following quantities with their appropriate units:
Match the following quantities with their appropriate units:
Which of the following prefixes represents a factor of 10⁶?
Which of the following prefixes represents a factor of 10⁶?
The derived unit for acceleration is expressed in meters per second squared.
The derived unit for acceleration is expressed in meters per second squared.
What prefix symbolizes a factor of 10⁻⁹?
What prefix symbolizes a factor of 10⁻⁹?
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Study Notes
Base Quantities and Units in SI
- Length: Measured in metres (m)
- Mass: Measured in kilograms (kg)
- Time: Measured in seconds (s)
- Temperature: Measured in kelvin (K)
- Electric Current: Measured in amperes (A)
- Luminous Intensity: Measured in candelas (cd)
- Amount of Substance: Measured in moles (mol)
Derived Quantities and Units
- Area: Measured in square metres (m²)
- Volume: Measured in cubic metres (m³) or litres (L)
- Density: Measured in kilograms per cubic metre (kg/m³) or grams per millilitre (g/mL), grams per litre (g/L)
- Velocity: Measured in metres per second (m/s) or kilometres per hour (km/h)
- Acceleration: Measured in metres per second squared (m/s²)
- Force: Measured in newtons (N)
- Pressure: Measured in pascals (Pa), with alternatives of mmHg or atmospheres (atm)
- Energy: Measured in joules (J) or electronvolts (eV)
SI Prefixes
- E for exa (10¹⁸)
- P for peta (10¹⁵)
- T for tera (10¹²)
- G for giga (10⁹)
- M for mega (10⁶)
- k for kilo (10³)
- h for hecto (10²)
- da for deca (10¹)
- d for deci (10⁻¹)
- c for centi (10⁻²)
- m for milli (10⁻³)
- µ for micro (10⁻⁶)
- n for nano (10⁻⁹)
- p for pico (10⁻¹²)
- f for femto (10⁻¹⁵)
- a for atto (10⁻¹⁸)
Base Quantities and Units in the SI
- Length: Measured in metres (m).
- Mass: Measured in kilograms (kg).
- Time: Measured in seconds (s).
- Temperature: Measured in kelvin (K).
- Electric Current: Measured in amperes (A).
- Luminous Intensity: Measured in candelas (cd).
- Amount of Substance: Measured in moles (mol).
Derived Quantities and Units
- Area: Symboled as S,A; measured in square metres (m²).
- Volume: Symboled as V; standard unit is cubic metres (m³) or litres (L).
- Density: Symboled as P; measured in kilograms per cubic metre (kg/m³) or grams per millilitre (g/mL).
- Velocity: Symboled as V; measured in metres per second (m/s) or kilometres per hour (km/h).
- Acceleration: Measured in metres per second squared (m/s²).
- Force: Symboled as F; measured in newtons (N).
- Pressure: Measured in pascals (Pa), mmHg, or atmosphere (atm).
- Energy: Symboled as E; measured in joules (J) or electronvolts (eV).
SI Prefixes
- Order of Magnitude: Used to denote scales of measurement through prefixes.
- Exa (E): (10^{18})
- Peta (P): (10^{15})
- Tera: (10^{12})
- Giga (G): (10^{9})
- Mega (M): (10^{6})
- Kilo (k): (10^{3})
- Hecto (h): (10^{2})
- Deca (da): (10^{1})
- Deci: (10^{-1})
- Centi: (10^{-2})
- Milli (m): (10^{-3})
- Micro: (10^{-6})
- Nano: (10^{-9})
- Pico: (10^{-12})
- Femto (f): (10^{-15})
- Atto: (10^{-18})
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