1. Li-Fi generally provides higher data transfer speeds than conventional Wi-Fi. 2. Li-Fi signals can pass through walls in the same way as Wi-Fi signals. 3. Li-Fi is less susceptible to electromagnetic interference. Which statements are correct?

1. Li-Fi works where radio frequency interference is undesirable or restricted. 2. Li-Fi may need line-of-sight or sufficient reflected light. 3. Li-Fi performance can be affected by external light, depending on design. Which statements are correct?

1. LEO satellites reduce latency than GEO due to shorter signal paths. 2. GEO satellites offer fixed regional coverage but have higher latency due to altitude. 3. MEO satellites balance coverage and latency between LEO and GEO systems. Which are correct?

1. Atmospheric conditions cannot affect signal quality in satellite communication. 2. Satellite internet always provides higher bandwidth than fibre-optic networks. 3. Satellite latency depends on Earth-satellite distance. Which are incorrect?

1. Satellite internet connects remote areas lacking terrestrial infrastructure. 2. Satellite internet uses ground stations to link to terrestrial networks. 3. Inter-satellite links can remove ground infrastructure for user connectivity. Which are correct?

1. LEO constellations use many satellites for near-continuous coverage. 2. LEO ground user terminals do not track moving satellites across the sky. 3. Satellite internet needs smaller user antennas than satellite TV. Which are correct?

4G Networks: Packet vs Circuit Switching - Which is/are correct? 1. Packet switching sends data in packets; circuit switching uses a dedicated path. 2. 4G uses packet-switched architecture for both data and voice. Select the correct answer:

Regarding LTE (Long-Term Evolution), what is/are correct? 1. LTE uses Orthogonal Frequency Division Multiplexing (OFDM) for data transmission. 2. LTE networks always require fallback to 3G networks for voice communication. Select the correct answer:

With reference to spectrum usage in 4G networks, what is/are correct? 1. Lower frequency bands provide wider coverage compared to higher frequency bands. 2. Higher frequency bands provide greater data capacity but generally lower coverage.

1. Optical fibres transmit information by converting electrical signals into light pulses. 2. Total internal reflection enables light to propagate through fibre core. 3. Optical fibres are unaffected by physical bending of the cable. Which are correct?

1. Optical fibres are immune to electromagnetic interference. 2. Optical fibres always provide lower latency than wireless communication systems. 3. Optical fibres support high-bandwidth data transmission. Which statements are correct?

1. Optical amplifiers can boost signals without converting them into electrical signals. 2. Dispersion in optical fibres can lead to signal distortion over long distances. 3. Optical fibre communication requires a direct line-of-sight. Which are correct?