In an expression $a \times 10^{b}$:
- A$b$ is the order of magnitude for $a \leq 5$.
- B$a$ is the order of magnitude for $b \leq 5$.
- C$b$ is the order of magnitude for $5 < a \leq 10$.
- D$b$ is the order of magnitude for $a \geq 5$.
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Provide a table for the multiples and submultiples of various $SI$ units.
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The $SI$ unit of length is 'metre'. Suppose we adopt a new unit of length which equals $x$ metre. Then,the area of $1 \ m^2$ expressed in terms of the new unit has a magnitude of:
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Column-$I$ Column-$II$ $(1)$ Light year $(a)$ $3.08 \times 10^{16} \ m$ $(2)$ Parsec $(b)$ $9.46 \times 10^{15} \ m$ $(3)$ $1 \ AU$ $(c)$ $1.496 \times 10^{11} \ m$
| Column-$I$ | Column-$II$ |
| $(1)$ Light year | $(a)$ $3.08 \times 10^{16} \ m$ |
| $(2)$ Parsec | $(b)$ $9.46 \times 10^{15} \ m$ |
| $(3)$ $1 \ AU$ | $(c)$ $1.496 \times 10^{11} \ m$ |
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