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Q.49U.P.P.C.S. (Pre) 2002; U.P.P.C.S. (Mains) 2007; U.P. Lower Sub. (Mains) 2015; U.P. Lower Sub. (Pre) 2013; U.P.U.D.A./L.D.A. (Pre) 2002
MCQ

The device by which data are transferred by telephone with the help of binary signals is –

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