The surface tension of a liquid is $70\,dyne/cm$. In $MKS$ system its value is
$70N/m$
$7 \times {10^{ - 2}}\,N/m$
$7 \times {10^3}\,N/m$
$7 \times {10^2}\,N/m$
The unit of permittivity of free space is
The units of modulus of rigidity are
Which one of the following pairs of quantities and their units is a proper match
Which of the following is unitless quantity ?
Hertz is the unit for