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

    $({n_1} + {u_1}) = ({n_2} + {u_2})$

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Given that: $\lambda  = a\,\cos \,\left( {\frac{t}{p} - qx} \right)$ , where $t$ represents time in second and $x$ represents distance in metre. Which of the following statements is true?

Some physical quantities are given in Column $I$ and some possible $SI$ units in which these quantities may be expressed are given in Column $II$. Match the physical quantities in Column $I$ with the units in Column $II$ and indicate your answer by darkening appropriate bubbles in the $4 \times 4$ matrix given in the $ORS$.

Column $I$ Column $II$

$(A)$ $\mathrm{GM}_e \mathrm{M}_5$

$\mathrm{G} \rightarrow$ universal gravitational constant, $\mathrm{M}_{\mathrm{e}} \rightarrow$ mass of the earth,

$\mathrm{M}_5 \rightarrow$ mass of the Sun

$(p)$ (volt) (coulomb) (metre)

$(B)$ $\frac{3 \mathrm{RT}}{\mathrm{M}} ; \mathrm{R} \rightarrow$ universal gas constant, $\mathrm{T} \rightarrow$ absolute temperature,

$\mathrm{M} \rightarrow$ molar mass

$(q)$ (kilogram) $(\text { metre) })^3$ (second) $)^{-2}$
$(C)$ $\frac{F^2}{q^2 B^2}$ ;$\quad F \rightarrow$ force, $q \rightarrow$ charge, $B \rightarrow$ magnetic field  $(r)$ $(\text { meter })^2$ (second) $)^{-2}$

$(D)$ $\frac{\mathrm{GM}_e}{\mathrm{R}_{\mathrm{e}}}, G \rightarrow$ universal gravitational constant,

$\mathrm{M}_{\mathrm{e}} \rightarrow$ mass of the earth, $\mathrm{R}_{\mathrm{e}} \rightarrow$ radius of the earth

$(s)$ (farad) $(\text { volt) })^2(\mathrm{~kg})^{-1}$

  • [IIT 2007]