13 Questions
What is the modern definition of a second?
The duration of 9192631770 complete oscillations of caesium-133 atom in a standard magnetic field.
What is the unit of time in CGS based on the mean solar day?
1/86400th of mean solar day
How many complete oscillations of caesium-133 atom in a standard magnetic field make up a second?
9192631770
How should the product of two units be written?
kgm or kg.m or kg m
Why are units never capitalized when written in full?
To maintain consistency and standardization in writing units
Give an example of a physical quantity that does not have units.
Mechanical advantage of a machine, velocity ratio, refractive index, atomic weight
What is the formula for calculating mechanical advantage?
load effort output force / input force
What are the units of volume for a solid body in the CGS, MKS, and SI systems?
cubic centimetre (cc) and cubic metre (m³)
What are the units of area in the CGS, MKS, and SI systems?
square centimetre (cm²) and square metre (m²)
Define a litre as a unit of volume.
Litre is the volume of 1 kg of water at normal atmospheric pressure and at the temperature of its maximum density at 4°C or 277K.
What is the unit of volume for a liquid in the FPS system?
gallon
How many millilitres are equivalent to 1 litre?
1000 millilitres (mL)
What is density of a material defined as?
Density of the material of a body is the quantity of its mass per unit volume.
Test your knowledge on the concept of mean solar day and the unit of time, second. Learn about the definition of mean solar day and the modern definition of a second in terms of caesium-133 atom oscillations. Practice recalling the conversion rules between hours, minutes, and seconds.
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