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  4. A torque meter is calibrated to reference standards of mass, length and time each with 5 % accuracy. After calibration, the measured torque with this torque meter will have net accuracy of :

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Q. A torque meter is calibrated to reference standards of mass, length and time each with 5\% accuracy. After calibration, the measured torque with this torque meter will have net accuracy of :

JEE MainJEE Main 2022Physical World, Units and Measurements

Solution:

Dimensional formula for Torque
$[\tau]=\left[ ML ^2 T ^{-2}\right]$
Now
Percentage error in torque $=\% \tau=\% M +2$
$\% L 2 \% T$
$\% \tau=25 \%$