Question

If $u_1$ and $u_2$ are the units selected in two systems of unit of any physical quantity and $n_1$ and $n_2$ are their numerical values then

• A. $n_1{u}_1=n_2{u}_2$
• B. $n_1+u_1=n_2+u_2$
• C. $n_1{n}_2=u_1{u}_2$
• D. $n_1{u}_1+n_2{u}_2=0$

Answer 1

The correct option is A $n_1{u}_1=n_2{u}_2$

For any physical quantity, the product of magnitude and its unit is constant.
$\Rightarrow n\times u=$ constant
$\Rightarrow n_1{u}_1=n_2{u}_2$