Tag: summary of si units

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Multiple choice physics dynamics - explaining motion system of unit summary of si units system of units

$\displaystyle kg{ ms }^{ -1 }$ is the SI unit of

  1. Impulse

  2. Force

  3. Angular velocity

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Impulse $(I)$ imparted to the body is equal to the change in linear momentum $(\Delta p)$ of the body.


Impulse, $I=\Delta p$

Thus momentum has the same units as that of impulse. Since momentum has S.I. unit as $kgms^{-1}$, impulse also has S.I. unit as $kgms^{-1}$.

Multiple choice physics dynamics - explaining motion system of unit summary of si units system of units

If 1 g cm$^{-3} = 10^3\,kg\, m^{-3}$ then $10^6kgm^{-3}=$

  1. $10^{-3}\,g\,cm^{-3}$

  2. $10^{6}\,g\,cm^{-3}$

  3. $10^{3}\,g\,cm^{-3}$

  4. $10^{-6}\,g\,cm^{-3}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given, $1 g cm^{-3}=10^3 kgm^{-3}$

If we multiply $10^3$ on both sides, $10^3 g cm^{-3}=10^3\times 10^3 kgm^{-3}$
or $10^3 g cm^{-3}=10^6 kgm^{-3}$
Thus, option C will be the right option. 

Multiple choice physics dynamics - explaining motion system of unit summary of si units system of units

SI unit of Magnetic flux is weber and its CGS unit is maxwell. Then 1 Wb = :

  1. $10^6$ maxwell

  2. $10^7$ maxwell

  3. $10^8$ maxwell

  4. $10^9$ maxwell
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Magnetic flux is the product of magnetic field and area.

As SI unit of magnetic flux is weber, so $1 \, Wb=Tesla (T)\times m^2$
where $1 \, T=10^{4} \, gauss$ and $1 m^2=10^4 cm^2$
(T and gauss is the SI and CGS unit of magnetic field )
So, $1 \, Wb=10^4 \, gauss \times 10^4cm^2=10^8 $ maxwell