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In which year the first Telephone call was made ?

1830
1857
1876
1896

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Alexander Graham Bell made the first call on March 10, 1876. He made a call to his assistant, Thomas Watson. The words of the call were: "Mr. Watson. come here. I want to see you."

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

1830
1857
1867
1876

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What is the role of twisted pair

Cancels electromagnetic interference
Produce noice
Detect cross connection
Increase waveleangth

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Twisted pair Cancels the electromagnetic interference.

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In which year the Touch-Tone dialing was introduced ? Touch tone is a telephone keypad and not rotary dial.

DTMFpad.jpg
1950
1955
1960
1965

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It was introduced by American Telephone & Telegraph Company (AT&T).

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What is the full form of "PSTN"?

Public Switched Telephone Network
Public Service Telephone Network
Public System Telephone Network
Public Socket Telephone Network

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The first commercial launch of 3G was in

1996
2001
2003
2007

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The first commercial launch of 3G was by NTT DoCoMo in Japan on 1 October 2001.

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Which company launched the first mobile phone ?

Motorola
Nokia
Apple
At&T

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The credit of first hand-held mobile phone commercially available goes to DynaTAC of Motorola.

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In which year the first mobile phone was launched ?

1971
1983
1975
1977

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The first hand held phone was launched by Motorola in 1983. It was DynaTAC 8000x model. Its prototype was demonstrated in 1973.

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In which year , the first person to person SMS from phone to phone was sent ?

1990
1991
1993
1994

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It was sent in Finland in 1993.

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Android is an Open Source cross platform OS by

Microsoft
Nokia
Google
RIM

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It was released in 2008.

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