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Number systems — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsNumber systems1 Mark
MCQ
If $\sqrt{7}=2.646$ then $\frac{1}{\sqrt{7}}=?$
  • A
    None of these.
  • ✓
    $0.378$
  • C
    $0.441$
  • D
    $0.375$
✓

Answer

Correct option: B.
$0.378$

$\frac{1}{\sqrt{7}}=\frac{1}{\sqrt{7}}\times\frac{\sqrt{7}}{\sqrt{7}}$
$=\frac{\sqrt{7}}{7}$
$=\frac{1}{7}\times\sqrt{7}$
$=\frac{1}{7}\times2.646$
$=0.378$

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