Q122 / 160 · TS EAMCET 2023 (12 May Shift 2) · Physics

The number of significant figures in $3.78 \times 10^{22} \mathrm{~kg}$ is

  • A
    $19$
  • B
    $25$
  • Correct answer
    C
    $3$
  • D
    $22$

Solution

In scientific rotation every number is expressed as a $\times$ $10^{\mathrm{b}}$, where $\mathrm{a}$ is between 1 and $10, \& \mathrm{~b}$ is any positive or negative exponent. The power of 10 is irrelevant to the determination of significant figures. Thus, in $3.78 \times 10^{22}$, number of significant figures is 3 .

Hence, the correct answer is option: 'C'.

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