Materials that change properties in response to external stimuli like temperature or stress are called ________ Materials.
- Ka
- Behavioral
- Smart / Responsive
- Quantum
Answer: Smart / Responsive
Smart materials (piezoelectrics, shape-memory alloys, electrochromics) respond to stimuli: mechanical stress, temperature, electric/magnetic fields. Applications: sensors, actuators, adaptive structures. India researches at DRDO, IITs. Critical for advanced materials and IoT questions.