Q: 13 (IAS/2010)
question_subject:
Science & Technology
question_exam:
IAS
stats:
0,78,157,38,33,86,78
keywords:
{'ghz range': [0, 0, 1, 0], 'microwave oven': [0, 0, 1, 1], 'radio frequency band': [0, 0, 1, 0], 'bluetooth device': [0, 0, 2, 0], 'fi device': [0, 0, 1, 0], 'cordless phone': [0, 0, 1, 0], 'wi': [0, 0, 1, 2]}
The 2-4 GHz and 2-5 GHz radio frequency bands are commonly used for wireless communication and networking technologies.
Bluetooth devices, cordless phones, and Wi-Fi devices are all examples of wireless communication technologies that operate within the 2-4 GHz and 2-5 GHz frequency bands.
Microwave ovens, on the other hand, operate at a much higher frequency range (around 2.45 GHz) and can cause interference with other devices that operate within the same frequency range.
Therefore, the correct answer is option 3, which includes Bluetooth devices, cordless phones, and Wi-Fi devices, but not microwave ovens.