Vodafone Training | Technical Quiz

Explanation
To increase the data rate of a system, both high order modulation technique and larger bandwidth can be used. High order modulation techniques allow for more bits to be transmitted per symbol, increasing the data rate. Using a larger bandwidth means more frequencies are available for transmitting data, which also increases the data rate. Therefore, using both high order modulation technique and larger bandwidth together can further enhance the system's data rate.

Explanation
The given statement states that 2G is voice only, but the correct answer is False. This means that the statement is incorrect. In reality, 2G technology supports both voice and data services, although the data speeds are significantly slower compared to newer generations like 3G and 4G. 2G networks were primarily designed for voice communication, but they also allowed basic data services like text messaging and limited internet access.

Explanation
Packet switching is simply a shared path. In packet switching, data is divided into small packets and transmitted over a network. These packets are then individually routed through the network based on the most efficient path available at that moment. This means that multiple packets from different sources can share the same network resources, such as routers and links, simultaneously. This sharing of resources allows for more efficient and flexible use of the network, as compared to dedicated paths where resources are exclusively allocated to a single connection.

Explanation
In circuit switching, a dedicated path is established between the sender and receiver for the entire duration of the communication session. This means that the resources, such as bandwidth and transmission capacity, are exclusively reserved for the communication between the two parties. Unlike in shared switching, where resources are shared among multiple users, circuit switching ensures a dedicated and uninterrupted connection, providing guaranteed quality of service. Therefore, the correct answer is "Dedicated."

Explanation
Wireless speed is typically slower than wired speed due to various factors such as signal interference, distance from the router, and the number of devices connected to the network. Wireless connections rely on radio waves, which can be affected by obstacles and other electronic devices, leading to decreased speed and reliability compared to wired connections that use physical cables.

Explanation
Mobile frequency bands are typically measured in megahertz (MHz). By using higher frequency bands, the wavelength of the signal becomes shorter, allowing for the use of smaller antennas. This is beneficial for mobile devices as it allows for more compact and portable designs. Using gigahertz (GHz) or hertz (Hz) frequency bands would result in longer wavelengths and larger antenna sizes, which would be impractical for mobile devices.

Explanation
The statement is true because the 2G system, which refers to the second generation of mobile communication technology, does indeed differ between Europe and the USA. In Europe, the widely used 2G system is known as GSM (Global System for Mobile Communications), while in the USA, the predominant 2G system is CDMA (Code Division Multiple Access). These two systems have different technical specifications and are not compatible with each other, which means that a 2G device used in Europe may not work in the USA, and vice versa.

Explanation
The first cellular systems were analogue. This means that they transmitted voice and data signals using continuous waveforms, allowing for a smooth and continuous transmission of information. Analogue systems were used before the advent of digital technology, and they had limitations in terms of signal quality and capacity. However, they paved the way for the development of digital cellular systems, which offer improved signal quality, capacity, and additional features such as data transmission.

Explanation
3G is better than 2G in voice quality because 3G networks use a higher frequency spectrum, allowing for more data to be transmitted. This increased bandwidth results in clearer and more reliable voice calls compared to 2G networks. Additionally, 3G networks often employ advanced audio codecs that further enhance voice quality.

Explanation
SIM stands for Subscriber Identity Module. It is a small chip that is inserted into mobile devices to identify and authenticate the user on a cellular network. The SIM card contains the user's unique subscriber information, such as their phone number, contacts, and text messages. It allows the user to access voice and data services provided by the network operator.