The International System of Units

The video tutorial discusses the evolution of measurement systems, highlighting the transition from various historical systems like CGS, MKS, and FPS to the universally adopted SI system. It explains the seven SI base units: meter, kilogram, second, ampere, kelvin, mole, and candela, along with their precise definitions. Additionally, it covers the SI units for angles, radian and steradian, and explains how all other units are derived from these base units.

Which system of units was used by the British before the adoption of the SI system?

• MKS system

• FPS system

• CGS system

• SI system

What is the SI unit for mass?

• Pound

• Kilogram

• Ounce

• Gram

How is the SI unit of time, the second, defined?

• The time taken for light to travel one meter in vacuum

• The time taken for a pendulum to swing back and forth

• The time taken for the Earth to rotate once on its axis

• The duration of 9,192,631,770 periods of radiation of cesium-133

What is the SI unit for temperature?

• Rankine

• Kelvin

• Fahrenheit

• Celsius

What is a radian in terms of a circle?

• An angle with a length equal to the radius of the circle

• An angle with a length equal to the circumference of the circle

• An angle with a length equal to the diameter of the circle

• An angle with a length equal to half the radius of the circle