1. True or false? Certain areas of the electromagnetic spectrum can be used without a permit.
- true
- false
Explanation: The correct answer is true. Certain areas of the electromagnetic spectrum have been set aside to allow public use without the restriction of having to apply for special permits.
2. True or false? Wi-Fi, Bluetooth, and cordless phones all use the same frequency ranges.
- true
- false
Explanation: The correct answer is false. Wi-Fi uses two different frequency ranges: 2.4 GHz and 5 GHz. Bluetooth also uses the 2.4 GHz frequency range. However, cordless phones operate at a lower ~900 MHz frequency range.
3. Which wired network technology has an inner wire surrounded by a tubular insulating layer, that is then surrounded by a tubular conducting shield.
- Category 5 cable
- coaxial cable
- Fiber-optic cable
Explanation: Coaxial cable has an inner wire surrounded by a tubular insulating layer, that is then surrounded by a tubular conducting shield.