Sensors do not need to be calibrated.

• A. True
• B. False
• C. Sometimes
• D. Never

Answer: (B)

Calibration is needed to keep sensor readings accurate. Over time and with changing conditions (temperature, supply voltage, aging, mounting stresses), sensors can drift, developing biases, gains, or nonlinearities that push outputs away from true values. Calibrating against known references adjusts these offsets and scales so the sensor’s output maps correctly to real-world quantities. Some devices may come factory-calibrated or include self-calibration routines, or only require occasional re-calibration, but the blanket statement that sensors do not need calibration is not correct. In practice, reliable robotics systems rely on calibration to maintain accuracy and trust in measurements.