Understanding Mobile Communications

What does the microphone in a mobile phone do?

• Converts voice into light pulses

• Converts voice into a digital signal

• Converts voice into analog signals

• Converts voice into electromagnetic waves

How are zeros and ones transmitted in mobile communications?

• By using different temperatures

• By using different colors

• By using different amplitudes

• By using different frequencies

Why can't electromagnetic waves travel long distances?

• They are blocked by the Earth's magnetic field

• They lose strength due to physical objects and environmental factors

• They are too heavy to travel far

• They are absorbed by the atmosphere

What is the purpose of cell towers in mobile communications?

• To store subscriber information

• To divide geographic areas into hexagonal cells

• To convert digital signals into analog signals

• To generate electromagnetic waves

What connects cell towers to provide national or international connectivity?

• Optical fiber cables

• Radio waves

• Copper wires

• Satellite links

What is the role of the mobile switching center (MSC)?

• To convert analog signals to digital

• To help cell towers locate subscribers

• To manage frequency slots

• To store all mobile phones

What happens when you move outside the range of your home MSC?

• Your phone switches off

• You lose all connectivity

• You are served by a foreign MSC

• You need a new SIM card

What was a major improvement introduced by 2G technology?

• Higher data transfer speed

• Analog voice calls

• MIMO technology

• Digital multiple access technologies

Which technology does 4G use to achieve higher speeds?

• OFDMA

• FDMA

• CDMA

• TDMA

What is a key feature of 5G technology?

• Analog signal transmission

• Single antenna systems

• Limited connectivity

• Enhanced MIMO technology