IR Sensor Question & Answers June 15, 2022 By WatElectronics This article lists 50 IR Sensor MCQs for Engineering Students. All the IR Sensor Questions & Answers given below include solutions and links to the relevant topic. This is helpful for users who are preparing for their exams and interviews, or professionals who would like to brush up on the fundamentals of the IR Sensor. The IR sensors or infrared sensors come in two bags one is a receiver and another one is a transmitter, and also the Ir sensors come in various packages and they differ in size also. The IR sensors are of two types they are active infrared sensors and passive infrared sensors. The sensor which is used for the automatic door opening system is the PIR sensor, the PIR sensor is also one type of IR sensor. The advantages of passive infrared sensors are they are low cost and have a short response time, and the disadvantage is it has a high miss rate. The advantages of active infrared sensors have a long-range and short response time and the disadvantage is they are expensive compared to passive infrared sensors. Infrared radiation is a type of light that falls outside the visible spectrum but can be felt as heat. The transmitter emits IR light and the receiver keeps checking for reflected light. The IR sensor is one type of digital sensor thus its output will either be zero or one. 1). Which one of the following sensors is used for the automatic door opening system? PIR Ultrasonic Temperature None of the above Hint 2). What is the standard form of PIR sensor? Partial Infrared Sensor Positive Infrared Sensor Passive Infrared Sensor None of the above Hint 3). Which one of the following sensors is used for distance measurement? PIR Ultrasonic Both a and b None of the above Hint 4). Which one of the following sensors is not portable? Ultrasound Laser Infrared None of the above Hint 5). Which one of the following sensors is expensive? Ultrasound Laser Infrared None of the above Hint 6). The wavelength of infrared sensor is from ____________ Nano meters? 760nm-1mm 760mm-1mm 760mm None of the above Hint 7). The vibration in raman spectroscopy is _________________ active? Raman active Infrared active Both a and b None of the above Hint 8). Which one of the following methods gives an indication of ionic character in the molecule? Raman Infrared Both a and b None of the above Hint 9). What is the standard form of CCD? Common Charged Devices Charged Coupled Devices Coupled Coupled Devices None of the above Hint 10). Which one of the following is insensitive to stray light? Conventional FT-IR Both a and b None of the above Hint 11). The operating principle of infrared sensors is ______________? Pyroelectric effect Doppler effect Both a and b None of the above Hint 12). The dual type Pyro electric infrared sensors are used for human body detection in a _______________ mounted set? Wall-mounted Ceiling mounted Both a and b None of the above Hint 13). What is the standard form of QWIP? Quantum Well Infrared Photovoltaic Quantum Well Infrared Photodetectors Quantum Well Infrared Pyroelectric None of the above Hint 14). Which one of the following needs lines of sight? Bluetooth Infrared Both a and b None of the above Hint 15). Which one of the following cannot penetrate solid objects? Bluetooth Infrared Both a and b None of the above Hint 16). The transmission power range of infrared wireless technology is up to __________________ mW? 100 mW 200 W 300 W None of the above Hint 17). The data rate of infrared wireless technology is up to _______________ Mbps? 1 Mbps 2 Mbps 16 Mbps 5 Mbps Hint 18). Which one of the following supports only two devices? Bluetooth Infrared Both a and b None of the above Hint 19). What is the standard form of MWIR thermal detectors? Midway Infrared Midway Insulator Midway Inductor None of the above Hint 20). The wavelength of visible light is from ____________ Nano meters? 760nm-1mm 760mm-1mm 360-760nm None of the above Hint IR Sensor MCQs for Quiz 21). The vibration in IR spectroscopy is _________________ active? Raman active Infrared active Both a and b None of the above Hint 22). What is the standard form of NEP? Noise Equivalent Pyroelectric Noise Equivalent Power Noise Equivalent Photodetector None of the above Hint 23). Which one of the following sensor measure distance through reflected light waves? Infrared sensor Ultrasonic sensor Both a and b None of the above Hint 24). Which one of the following is an example of a passive infrared sensor? Reflectance sensor Bolometer Pyroelectric detector Both b and c Hint 25). The sensing distance of proximity sensor is _____________? 0.5-120mm 0.5-120nm 0.5-120m None of the above Hint 26). Which one of the following is a type of nontactile sensor? Potentiometers Microswitches Ultrasonic sensor All of the above Hint 27). The transmission power is 100mW in _________ wireless technology? Infrared Bluetooth Both a and b None of the above Hint 28). The infrared sensors have __________ data transmission rate? Very high Medium Better Less Hint 29). The figure shown below is a block diagram of ___________ sensor? Fiber optic UV sensor IR sensor None of the above Hint 30). What are the disadvantages of infrared sensors? Noise immunity is very strong Range is limited Line of sight is required Both a and b Hint IR Sensor MCQs for Exams 31). Which one of the following methods gives an indication of covalent character in the molecule? Raman Infrared Both a and b None of the above Hint 32). What is the standard form of FTIR? Fourier Transform Infrared Spectroscopy Fast Transform Infrared Spectroscopy Fourier Infrared Spectroscopy None of the above Hint 33). The quad type Pyro electric infrared sensors are used for human body detection in a _______________ mounted set? Wall-mounted Ceiling mounted Both a and b None of the above Hint 34). What is the standard form of QDWELL? Quantum Well Infrared Photovoltaic Quantum Double Well Infrared Pyroelectric Quantum Dots in a Well Infrared Photodetectors None of the above Hint 35). Which one of the following sensors has a long response time? Active infrared Passive infrared Ultrasonic None of the above Hint 36). Which one of the following is an example of the active infrared sensor? Reflectance sensor Bolometer Pyroelectric detector All of the above Hint 37). The sensing distance of capacitance sensor is _____________? 0-50mm 50nm 50m None of the above Hint 38). Which one of the following is a type of tactile sensor? Potentiometers Ultrasonic sensors Magnetic sensors All of the above Hint 39). The transmission power is 1mW in _________ wireless technology? Infrared Bluetooth Both a and b None of the above Hint 40). The figure shown below is a block diagram of ___________ sensor? Fiber optic UV sensor IR sensor None of the above Hint IR Sensor MCQs for Interviews 41). What are the advantages of infrared sensors? Noise immunity is very strong Range is limited Line of sight is required None of the above Hint 42). In which one of the following spectroscopy the water cannot be used as solvent? Raman active Infrared active Both a and b None of the above Hint 43). The break beam sensor is an example for ____________ sensor? Active Passive Both a and b None of the above Hint Read more about Sensors 44). The sensing distance of photoelectric sensor is _____________? 0-50m 50nm 50mm None of the above Hint 45). What is the standard form of TQDIP? Triple Quantum Well Infrared Photovoltaic Transistor Quantum Double Well Infrared Pyroelectric Tunneling Quantum Dot Infrared Photodetectors None of the above Hint 46). Which one of the following is suitable to measure complex objects? IR sensor Ultrasonic sensor Both a and b None of the above Hint 47). In which one of the following rays the color sensation is sensitive? Sonar Infrared Both a and b None of the above Hint 48). Which one of the following rays is non-sensitive for sound speed change? Sonar Infrared Both a and b None of the above Hint 49). Which one of the following is a disadvantage of the passive infrared sensors? Low cost Short response time High miss rate All of the above Hint 50). What is the standard form of DTGS? Deuterated Triglycin Sulfate Deuterated Triglycin Sodium Deuterated Glycin Sulfate None of the above Hint Read more about IR Sensor Please fill in the comment box below. Time is Up! Time's up
