SSC General Science & Technology Sample Paper NCERT Sample Paper-6

  • question_answer
    Which one of the following statements about the Radio waves of the electromagnetic spectrum is not correct?

    A)  Radio waves are generally captured by antennas of appropriate size

    B)  Radio wave is ranges from hundreds of metres to about one millimetre

    C)  Radio wave is used in mobile phones, wireless networking and amateur radio

    D)  Wi-Fi is mainly depended on the radio waves to transmit data or information

    Correct Answer: D

    Solution :

    [d] A wireless network uses radio waves, just like cell phones, televisions and radios do. In fact, communication across a wireless network is a lot like two-way radio communication. Here's what happens: A computer's wireless adapter translates data into a radio signal and transmits it using an antenna. A wireless router receives the signal and decodes it. The router sends the information to the Internet using a physical, wired Ethernet connection. The process also works in reverse, with the router receiving information from the Internet, translating it into a radio signal and sending it to the computer's wireless adapter. The distance between wifi waves is shorter than that of radio waves and longer than that of microwaves, giving wifi a unique transmission band that can't be interrupted by other signals.

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