1.Units, Dimensions and Measurement
hard

એક ભૌતિકરાશિ $Q$ એ $a, b, c$ રાશિઓ સાથે $Q=\frac{a^4 b^3}{c^2}$ સમીકરણ મુજબ સંબંધ ધરાવે છે. $a, b$ અને $c$ માં પ્રતિશત ત્રૂટિ અનુક્રમે $3 \%, 4 \%$ અને $5 \%$ છે. $Q$ માં પ્રતિશત ત્રુટિ__________છે.

A

 $66 \%$

B

 $43 \%$

C

 $34 \%$

D

 $14 \%$

(JEE MAIN-2024)

Solution

$ \mathrm{Q}=\frac{\mathrm{a}^4 \mathrm{~b}^3}{\mathrm{c}^2} $

$ \frac{\Delta \mathrm{Q}}{\mathrm{Q}}=4 \frac{\Delta \mathrm{a}}{\mathrm{a}}+3 \frac{\Delta \mathrm{b}}{\mathrm{b}}+2 \frac{\Delta \mathrm{c}}{\mathrm{c}} $

$ \frac{\Delta \mathrm{Q}}{\mathrm{Q}} \times 100=4\left(\frac{\Delta \mathrm{a}}{\mathrm{a}} \times 100\right)+3\left(\frac{\Delta \mathrm{b}}{\mathrm{b}} \times 100\right)+2\left(\frac{\Delta \mathrm{c}}{\mathrm{c}} \times 100\right) $

$ \% \text { error in } \mathrm{Q}=4 \times 3 \%+3 \times 4 \%+2 \times 5 \% $

$=12 \%+12 \%+10 \% $

$=34 \%$

Standard 11
Physics

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