Question

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 :

(A) 15%

(B) 25%

(C) 75%

(D) 5%

Answer 1

Correct option is (B) 25%

Dimensional formula for Torque 

[\(\tau\)] = [ML²T^–2]

Now

Percentage error in torque = % \(\tau\) = % M + 2 % L + 2 % T 

% \(\tau\) = 25%