KERALA PSC / PHYSICS / TELECOMMUNICATION / OBJECTIVE
QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY /
NOTES
KERALA PSC / PHYSICS / TELECOMMUNICATION / OBJECTIVE
QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY /
NOTES
·
A
revolution in wireless telecommunications began in the first decade of the 20th
century, with Guglielmo Marconi winning the Nobel Prize in Physics in 1909 for
his pioneering developments in wireless radio communications
·
The
first commercial electrical telegraph was constructed by sir Charles Wheatstone
and Sir William Fothergill Cooke, and its use began on 1839.
·
Alexander
Graham Bell invented the telephone
·
The
first commercial telephone services were set up in 1878 and 1879 on both sides
of the Atlantic.
·
Telex
means Teleprinter Exchange
·
INTELSAT
(International Telecommunication Satellite Organization), with its headquarters
in Washington DC, was established on February 12, 1973. It operates space
equipment and earth stations owned by telecommunication entities in each
country. INTELSAT’S 13 satellite system provides about two-thirds of the
world’s international telecommunication services to more than 140 countries
including India.
·
Father
of cybernetics – Norbert Weiner
·
RADAR
is Radio Detection and Ranging
·
RADAR
is a device that uses radio waves to detect the position of objects such as
aeroplanes, missiles etc….
·
Radar
was invented by Albert H. Taylor and Leo C. Young.
·
The
first telecommunications device was the telegraph
·
A
television camera takes 25 or 30 electronic photographs (called frames) of a
scene every second.
·
Hybrid
computers are a combination of the analog and digital computers.
KERALA PSC / PHYSICS / TELECOMMUNICATION / OBJECTIVE
QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY /
NOTES
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