Question

If $u_{1}$ and $u_{2}$ are the units selected in two systems of measurement and $n_{1}$ and $n_{2}$ their numerical values, then

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

Answer 1

Answer: (A)

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

Answer 2

Physical quantity (p)

= Numerical value (n)$\times$ Unit (u)

If physical quantity remains constant then n ∝ 1/u

∴ n₁u₁ = n₂u₂.