Question

A wireless technology built-in electronic gadgets used for exchanging data over short distances is?

• A. Wifi
• B. Bluetooth
• C. Modem
• D. USB

Hint:

To distinguish between wireless technologies:
- Bluetooth: Short range ($<$10m), low power, direct device-to-device connection (PAN).
- Wi-Fi: Medium range ($<$100m), higher power, network-centric internet access (WLAN).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Wireless communication technologies allow electronic devices to exchange data without physical cable connections.
These technologies are classified based on their range, data transfer speed, and power consumption.

Step 2: Detailed Explanation:
Let us evaluate each of the listed options:
- Wifi (Option A): A wireless technology used primarily for local area networking (WLAN) to connect devices to the internet.
While wireless, its primary purpose is high-speed network connectivity over medium distances (typically up to 100 meters), rather than simple ad-hoc data exchange between nearby gadgets.
- Bluetooth (Option B): A wireless technology standard designed specifically for exchanging data over short distances (typically less than 10 meters) using short-wavelength UHF radio waves (in the 2.4 GHz ISM band).
It is built into gadgets like smartphones, wireless headphones, smartwatches, and laptops to create Personal Area Networks (PANs) for quick, low-power data exchange. This matches the description in the question.
- Modem (Option C): A hardware device (Modulator-Demodulator) that converts analog signals to digital signals and vice versa to enable internet connectivity over telephone lines or cables. It is not a short-range wireless standard.
- USB (Option D): A wired technology (Universal Serial Bus) used for connecting peripherals to computers.

Step 3: Final Answer:
The wireless technology used for exchanging data over short distances is Bluetooth.