Smart Materials MCQ — 99 Practice Questions with Answers

Q1. Consider the following statements about ferroelectric and piezoelectric materials: 1. Ferroelectrics are a subset of piezoelectrics with a polar crystal structure. 2. Ferroelectrics possess spontaneous polarization that can be reoriented by an electric field. 3. Nitride perovskites are described as well known, while oxide perovskites are described as much less known. 4. NLR notes that these materials are important for 5G and 6G telecommunications and are promising for energy-efficient nonvolatile memory. Which of the statements given above are correct?

Q2. Consider the following statements about dielectric and piezoelectric ceramics: 1. Capacitors store electric energy in the form of an electric field between separated electrodes. 2. Dielectrics are good conductors of electricity. 3. Ceramic materials serve as the dielectric in more than 90 percent of all capacitors. Which of the statements given above are correct?

Q3. Consider the following statements about barium titanate in capacitor dielectric and piezoelectric ceramics: 1. More than 90 percent of all capacitors are produced with ceramic materials serving as the dielectric. 2. Most ceramic capacitor dielectrics are made of barium titanate and related perovskite compounds. 3. Below about 120°C, barium titanate changes to a tetragonal structure as ions shift from cubic positions. 4. Ferroelectricity is described as irrelevant to the utility of barium titanate as a dielectric material. Which of the statements given above are correct?

Q4. Consider the following statements about smart oxide materials: 1. Missing oxygen atoms can create spaces and active sites that help ion movement. 2. Ion movement in such a smart oxide can trigger electronic changes linked with visible charge indication. 3. The cited CeNS smart oxide derives its charge-indication ability from immobilising ions completely. 4. The cited mechanism treats missing oxygen atoms as unrelated to charge storage. Which of the statements given above are correct?

Q5. Consider the following statements about Smart Materials: 1. NASA links material fatigue with repetitive stress. 2. SMASH technology begins by adding shape-memory wire to metal alloys. 3. NASA stated that spacecraft far from Earth would easily have access to a repair shop. Which of the statements given above are correct?