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Who is credited for inventing the first telephone exchange ?

Alexander Graham Bell
Antonio Meucci
Thomas Edison
Tivadar Puskas

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Tivadar Puskás was working for Thomas Edison when he build the first telephone exchange in 1877. The very first experimental telephone exchange was built by the Bell Telephone Company in Boston in 1877 and the very first commercial telephone exchange opened in Friedrichsberg close to Berlin on November 12 1877.

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In which year the first telephone switchboard(exchange) was invented ?

1830
1857
1867
1876

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The Digital signal 1 is also known as

D1
S1
T1
M1

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It is a T-carrier signaling scheme devised by Bell Labs.

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What is the full form of "GSM" in Telecommunications?

Global Site for Mobile Communications
General System for Mobile Communications
Global System for Mobile Commands
Global System for Mobile Communications

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In which year, the world's first GSM phone call was made ?

1974
1983
1988
1991

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On March 27, 1991 on Radiolinja's network, the world's first GSM phone call was made.  Radiolinja' was a Finnish GSM operator and now is a part of Elisa Oyj.

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The main difference between 1G and 2G are

1G uses Analog radio signals while 2G uses Digital
1G is through cables and 2G though satellites
1G uses Coax while 2G used Optics
1G in in wired phones while 2G in Mobile phones.

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1G can transfer data (only voice) in analog wave. There is no encryption in it and the sound quality is very poor. The speed of transfer is only at 9.6kbps.

2G is there is the concept of digital modulation. The main difference is thet 2G is digital.

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Who is considered as the inventor of the first practical mobile phone for hand-held ?

James Cooper
Smith Cooper
Martin Cooper
Royn Cooper

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He was Motorola researcher and executive.

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The first commerciall cellular network (2 G) was launched in which country ?

Finland
USA
Denmark
Japan

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It was launched by Radiolinja in 1991 in Finland.

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The first SIM card was made in which year ?

1983
1988
1991
1994

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They were made by Munich smart card maker Giesecke & Devrient selling to Finnish wireless network operator Radiolinja.

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In which year, the first Blackberry smartphone was launched ?

1998
2002
2004
2006

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That smartphone supported push e-mail, mobile telephone, text messaging, Internet faxing, Web browsing and other wireless information services

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