First slide

Physical quantities and units

Question

If u₁ and u₂ are the units selected in two systems of measurement and n₁ and n₂ their numerical values, then

Easy

A

$n_{1} u_{1} = n_{2} u_{2}$
B

$n_{1} u_{1} + n_{2} u_{2} = 0$
C

$n_{1} n_{2} = u_{1} u_{2}$
D

$(n_{1} + u_{1}) = (n_{2} + u_{2})$

Solution

Physical quantity (p) = Numerical value (n) $\times$ unit (u)
If physical quantity remains constant then
$n \propto 1 / u ∴ n_{1} u_{1} = n_{2} u_{2}$

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