LiFi Question and Answers March 9, 2021 By admin This article lists 50+ LiFi Technology MCQs for engineering students. All the LiFi Technology Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on LiFi Technology. Current digital communication is entirely based on the internet, where all smart devices like laptops, computers, watches, mobile phones, etc are connected to the internet via a physical medium like routers, fire sticks, etc. A smart 5th generation technology which is an advanced version of Wi-Fi is Li-Fi, Light Fidelity technology. LiFi technology generally uses 6 modulation schemes, namely on-off keying – OOK, variable pulse positioning modulation – VPPM, color shift keying –CSK, subcarrier inverse PPM – SCIPPM, Frequency shift keying – FSK, SIM – OFDM – subcarrier index modulation OFDM. Some of the advantages of LiFi technology are it is a cost-efficient process, simple and fast in operation. LiFi technology is commonly applied in military communication, corporates offices, hospitals, etc. 1). LiFi stands for? Light Fidelity Life Fidelity Lean Fidelity None of the above None Hint 2). LiFi technology was proposed by___? Richard Edinburgh Dennis Charles None Hint 3). LiFi technology connects to the Internet using _____ source Plugin Voltage source Light Firewall None Hint 4). Which of the following are the advantages of LiFi technology? Cost efficient Simple Faster All the above None Hint 5). Does LiFi technology requires any physical medium like a router to access the Internet? Yes No Maybe Depends on the situation None Hint 6). LiFi technology is a _____ Directional wireless system Bi-directional Unidirectional Multi-directional None of the above None Hint 7). Which of the following are the basic components of LiFi technology? Light source Electronic chip Wifi All the above None Hint 8). LiFi technology improves which of the following factor of wifi Speed Bandwidth Noise Both a and b None Hint 9). If a number of users using LiFi technology at a time it _____ the performance Improves Degrades Maintenance stable Both a and b None Hint 10). What is the frequency of LiFi technology? 200,000GHz 100, 000 GHz 300,000 GHz 20000MHz None Hint 11). Which of the following is the application of LiFi technology? Home Appliances Hospitals Airports All the above None Hint 12). Which of the following is the speed of WiFi technology? 11 to 300 Mbits/sec 10 to 300 Mbits/sec 11 to 100 Mbits/sec 11 to 1300 Mbits/sec None Hint 13). VLC stands for Visible light communication Variable light communication Visibility laser communication Any of the above None Hint 14) LiFi has _____ many times greater bandwidth than radio spectrum 10,000 100 10 1000 None Hint 15). Is LiFi technology is more reliable than WiFi? Yes No Maybe None of the above None Hint 16). LiFi is a _____ Networking Technology Wireless optical Wired Wired transmission LAN None Hint 17). LiFi is _____for high density data coverage Static Dynamic Ideal Infinite None Hint 18). LED stands for Light emitting diode Lithium emitted diode Light emission diode Light emitting device None Hint 19). The spectrum used in LiFi 10,000 times greater than WiFi 100 times greater than WiFi spectrum Narrow spectrum Broad spectrum None Hint 20). Data density in WiFi is _____ than LiFi High Low Medium Zero None Hint LiFi Technologies Interview Questions and Answers 21). The latency of LiFi technology is _____ Low High Order of microseconds Order of milliseconds None Hint 22). Obstacle interference is _____ in Li-Fi technology than WiFi technology High Low Medium 0 None Hint 23). The process that uses a rapid pulse of light to transmit information wirelessly is technically referred to as _____ VLC LED Diode Torch None Hint 24). Li-Fi technology works on the principle of _____ VLC LED Diode Torch None Hint 25). VLC - visible light communication is based on which electronic component? LED Diode Torch None of the above None Hint 26). How many modulation schemes are used in LiFi technology? 3 4 5 6 None Hint Read more about Modulation 27). On-off keying – OOK modulation technique uses _____ coding technique Manchester coding Hash Key MD5 All the above None Hint 28). In on-off keying – OOK modulation technique if the bit rate is high _____ coding is used Manchester coding Run length limited MD5 All the above None Hint 29). Standard VLC specifies VLC consist of _____ number of communication types 2 3 4 5 None Hint 30). VLC mainly focuses on _____ range of communication for traffic intelligence system at low speed and short range Large Medium Small Very large None Hint 32). LiFi communication is defined in _____ and _____ layers for VLC/LiFi Physical layer, medium access layer (MAC) Medium access layer (MAC), Data layer Data layer, physical layer Physical layer, transport layer None Hint 33). MAC layer has _____ number of multi-access technologies 2 3 4 6 None Hint 31). What is the range of data rates supported by various modulation schemas? 100 kbps to 100 Mbps 10 kbps to 100 Mbps 100 bps to 100 Mbps 100 kbps to 100 Gbps None Hint 34). MAC layer addresses _____ Layer issues such as addressing, collision avoidance Data layer Physical layer Transport layer None of the above None Hint 35). The physical layer in MAC is divided into _____ number of phases 2 3 4 5 None Hint 36). PPM or VPPM modulation scheme encodes the data using _____ parameter of pulse in a time period Position Length Distance Phase None Hint 37). Which type of modulation scheme is used when RGB type LED illumination system is used? Color shift keying VPPM OOK FSK None Hint 38). RGB in RGB -LED stands for? Red, green, blue Red, grey, blue Read, gate, blue None of the above None Hint Read more about RGB 39). RGB-CSK modulation scheme _____ the complexity of trans receiver Increase Decreases Maintains the same Zero None Hint 40). SCIPPM modulation scheme is further classified into how many parts One Two Three Four None Hint 41). What is the purpose of DC in SCIPPM modulation? Used for lighting purpose Transmission purpose Receiving purpose Storage purpose None Hint 42). Data in FSK modulation is represented by _____ of the carrier signal Varying frequency Varying message Varying amplitude None of the above None Hint 43). Data in digital form is represented as _____ 0’s 1’s ASCII Both a and b None Hint 44). Which of the following are the components used in LiFi smart classes? Transmission source Receiving element Server All the above None Hint 45). Which of the following are the limitation of Li/Fi technology? Does not pass through objects Network coverage is less Low reliability All the above None Hint Li-Fi Technology Quiz Questions and Answers 46). LiFi technology is _____ generation technology 2G 3G 5G None Hint 47). Which of the following factors are considered while designing LiFi? Light LOS- Line of sight LED All the above None Hint 48). LOS stands for Line of sight Lose of sight Lose of signal Line of sight None Hint 49). Is LiFi technology better than WiFi? Yes No Both a and b Depends on factors None Hint 50). WiFi stands for Wireless Fidelity Wired Fidelity Wide Fidelity None of the above None Hint Read more about WiFi Technology 51). The data in LIFI is transmitted using the _____ Infrared waves Ultraviolet waves Radio waves None of the above None Hint 52). The speed of the LIFI technology is up to ______ 20Gbps 30Gbps 10Gbps None of the above None Hint 53). The maximum speed supported by the standard IEEE 802.11ac is _______ 20Gbps 1.3Gbps 10Gbps None of the above None Hint 54). The maximum speed supported by the standard IEEE 802.11ad is ______ 20Gbps 7Gbps 10Gbps None of the above None Hint 55). The bandwidth of the radio waves is ______ 200GHz 100GHz 300GHz None of the above None Hint 56). The bandwidth of the visible spectrum is ______ 200GHz 100GHz 300THz None of the above None Hint 57). The range of LIFI is _____ 11Mbps 12 Mbps 20 Mbps None of the above None Hint 58). In security aspire the LIFI is _____ Low secure Highly secure Medium secure None of the above None Hint 59). The LIFI uses standard of ______ IEEE 802.15 IEEE 801.15 IEEE 804.15 None of the above None Hint 60). The development of LIFI technology started in _______ 1990 2000 2011 None of the above None Hint Time's up
