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Mean Solar Day and Second Unit of Time Quiz

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Mean Solar Day and Second Unit of Time Quiz

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Questions and Answers

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 Signup and view all the answers

Why are units never capitalized when written in full?

To maintain consistency and standardization in writing units Signup and view all the answers

Give an example of a physical quantity that does not have units.

Mechanical advantage of a machine, velocity ratio, refractive index, atomic weight Signup and view all the answers

What is the formula for calculating mechanical advantage?

load effort output force / input force Signup and view all the answers

What are the units of volume for a solid body in the CGS, MKS, and SI systems?

cubic centimetre (cc) and cubic metre (m³) Signup and view all the answers

What are the units of area in the CGS, MKS, and SI systems?

square centimetre (cm²) and square metre (m²) Signup and view all the answers

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. Signup and view all the answers

What is the unit of volume for a liquid in the FPS system?

gallon Signup and view all the answers

How many millilitres are equivalent to 1 litre?

1000 millilitres (mL) Signup and view all the answers

What is density of a material defined as?

Density of the material of a body is the quantity of its mass per unit volume. Signup and view all the answers