Tag: summary of si units

Magnetic Flux is defined as the number of magnetic field lines passing through a given closed surface. It gives the measurement of the total magnetic field that passes through a given surface area. S.I. unit of magnetic flux is Weber $(Wb)$.

Pulling of a cart, stretching of a coiled spring and kicking of a football take place due to contact forces. A contact force is any force that requires contact to occur. But electrical force is a non contact force which acts on an object without coming physically in contact.

The waves produces by the supersonic jet planes are shock waves. When a wave moves faster than the local speed of sound in a fluid, it is a shock wave.

$1\ cm=0.1\ dm$ or $10\ cm=1\ dm$

Micro is a prefix used in defining some units.  Whenever the word micro is attached as a prefix to an SI unit,  it means it is one million times smaller than that unit. For example, 1 micrometre is one millionth part of a metre. Rest all other options are not   prefixes 

When 'Deca' is attached as a prefix to a unit, it means it is 10 times of that unit.  Kilo means thousand times of a unit.  Femto means of $ {10}^{-15} $ of a unit. Mica is not a prefix but a name of a specific material.

Here femto, atto and zepto, all are used as a prefix in the SI system.

Mega, Hecto and Tera are used as SI prefix. Mega is used for $10^{6}$, Hecto for $10^2$ and Tera for $10^{12}$.