S1: Transducer is a device which converts physical into electrical quantity
S2: Transducer is also called as sensor.

Statement 1 (S1) is true because a transducer is a device that converts a physical quantity (such as temperature, pressure, or light) into an electrical quantity (such as voltage or current). This conversion is essential for measurement and control systems in electronics and instrumentation.

Statement 2 (S2) is also true because a transducer is commonly referred to as a sensor. Sensors detect changes in physical conditions and convert them into signals that can be measured and analyzed. Therefore, both statements accurately describe the nature and function of transducers.