UGC NET Computer Science December 2019 | Question 33

Question 33

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____ is a wireless technology built in electronic gadgets for transferring data over short distance

1. 1. WiFi
2. 2. Bluetooth
3. 3. Modem
4. 4. USB

Explanation

Wi-Fi is a family of wireless networking technologies, based on the IEEE 802.11 family of standards, which are commonly used for local area networking (LAN) of devices and Internet access. An access point (or hotspot) often has a range of about 20 metres (66 feet) indoors while some modern access points claim up to a 150-metre (490-foot) range outdoors.

Bluetooth is a wireless technology standard for exchanging data over short distances from fixed and mobile devices, and building personal area networks (PANs). It uses short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz.
Bluetooth Reference: Ranges of Bluetooth devices by class

Modem – a portmanteau of "modulator-demodulator" – is a hardware device that used to convert data into a format suitable for a transmission medium

USB was designed to standardize the connection of peripherals to personal computers, both to communicate with and to supply electric power. It has largely replaced interfaces such as serial ports and parallel ports, and has become commonplace on a wide range of devices.

Here from given options, Modem and USB are for wired devices.
Wi-Fi has higher range than bluetooth devices.

So, Answer 2 is correct answer.

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