1. Quantum tunnelling becomes negligible for macroscopic objects. 2. Energy quantisation means systems have arbitrary energy levels. 3. Both quantum tunnelling and energy quantisation arise due to wave-like behaviour of particles. Which are correct?

1. 3D printing involves layer-by-layer addition of material to create objects. 2. It is a form of subtractive manufacturing where material is removed to shape objects. 3. It allows rapid prototyping and customisation of designs. Which are correct?

1. 3D printing reduces material wastage compared to traditional manufacturing. 2. It is suitable for complex geometries difficult with conventional methods. 3. It always enables faster mass production compared to traditional methods. Which are correct?

1. 3D printing enables decentralised, near-use manufacturing. 2. 3D printing design files can be easily modified without changing the setup. 3. 3D printing can reduce inventory requirements by enabling on-demand production. Which are correct?

With reference to Bluetooth technology, consider:1. Bluetooth operates in the 2.4 GHz ISM band. 2. It uses frequency hopping to reduce interference. 3. It requires line-of-sight communication between devices. Which of the statements are correct?

1. Bluetooth Low Energy (BLE) is designed to consume less power compared to classic Bluetooth. 2. BLE suits continuous high data-rate uses like audio streaming. 3. BLE is widely used in IoT devices like fitness trackers. Which statements are correct?

1. Bluetooth devices can form small networks called piconets. 2. A Bluetooth piconet can include one master and multiple slave devices. 3. Bluetooth communication is designed for long-range, high-power transmission similar to Wi-Fi. Which are correct?

1. In-flight internet can use satellite-based communication systems. 2. Air-to-ground (ATG) systems link aircraft with ground cellular towers. 3. In-flight internet invariably uses geostationary satellites for connectivity. Which statements are correct?

1. Satellite links may have higher latency than ground systems. 2. Weather conditions can affect the quality of satellite communication. 3. In-flight internet speed is constantly comparable to ground broadband. Which statements are correct?

1. Li-Fi can use wavelengths beyond the visible light spectrum. 2. Li-Fi provides high data rates due to the large bandwidth available in the optical spectrum. 3. Continuous illumination is not strictly necessary for Li-Fi in all cases. Which are correct?

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?