Electrochromic Devices MCQ — 97 Practice Questions with Answers

Q1. Consider the following statements about the smart oxide reported by DST: 1. Oxygen vacancies were described as creating extra space and active sites in the lattice. 2. Ion movement during charge storage triggered a shift in electronic structure and visible colour change. 3. The device was reported to power an LCD timer and light an LED. 4. The material lost function under mechanical bending according to the report. Which of the statements given above are correct?

Q2. Consider the following statements about the smart oxide reported by the Department of Science and Technology: 1. The material can store energy and also change colour to show the amount of charge. 2. The report says most electronic devices commonly store energy and display information at the same time. 3. In a device made with this oxide, the colour changes from blue in the charged state to transparent in the discharged state. Which of the statements given above are correct?

Q3. Consider the following statements about large-area chromogenic and electrochromic switching: 1. Such devices can be used for dynamic control of light through building and vehicle glazings. 2. Chromogenic glazings can be used to modulate reflector surfaces for automotive mirrors. 3. In the visible region, switching ranges can go from as high as 80% to 5-10% transmittance. 4. Long-term memory in these devices cannot be maintained without a holding potential. Which of the statements given above are correct?

Q4. Consider the following statements about the DST-supported transparent battery prototype: 1. The aqueous electrolyte in the prototype was described as having two orders of magnitude higher ion conductivity than a gel electrolyte. 2. The device showed an areal discharge capacity of 155 milliampere-hour per square metre and an optical contrast of 68 percent. 3. The DST release says a single cathode improves the device's specific capacity and optical contrast compared with a dual-cathode design. 4. The project was supported by the Council of Scientific and Industrial Research, according to the DST release. Which of the statements given above are correct?

Q5. Consider the following statements about transmission and reflectance modes of electrochromic devices: 1. In transmission mode, transparent conducting electrodes control light intensity passing through them. 2. Transmission mode is used in smart-window applications. 3. Reflectance mode is described as useful only in solar cells, not in rear-view mirrors or display devices. Which of the statements given above are correct?