UPSC Prelims 2010·GS1·science-and-technology·it and communication

Consider the following: 1. Bluetooth device 2. Cordless phone 3. Microwave oven 4. Wi-Fi device Which of the above can operate between 2.4 and 2.5 GHz range of radio frequency band?

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Last updated 23 May 2026, 3:31 pm IST
  1. A1 and 2 only
  2. B3 and 4 only
  3. C1, 2 and 4 only
  4. D1, 2, 3 and 4Correct

Explanation

The correct answer is D because all four devices operate within the 2.4 GHz Industrial, Scientific, and Medical (ISM) radio band. 1. Bluetooth devices use the 2.4 GHz frequency for short range communication between electronics. 2. Many cordless phones operate on the 2.4 GHz band to provide wireless connectivity within a home. 3. Microwave ovens use 2.45 GHz frequencies to heat food by agitating water molecules. 4. Wi-Fi devices commonly use the 2.4 GHz band for wireless internet networking. Since the 2.4 GHz band is an unlicensed frequency range, it is shared by a variety of consumer technologies and household appliances, which can sometimes lead to signal interference between them.
science-and-technology: Consider the following: 1. Bluetooth device 2. Cordless phone 3. Microwave oven 4. Wi-Fi device Which of the above can o
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