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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:
Explanation
As $[\tau] = ML^{2}T^{-2}$ So, $\Delta\tau/\tau = \Delta M/M + 2\Delta L/L + 2\Delta T/T = 0.05 + 2 \times 0.05 + 2 \times 0.05 = 0.25$ So, $\Delta\tau/\tau \times 100 = 0.25 \times 100 = 25\%$