General Principles in the Working of Telegraphs, Telephone NDA Questions

NDA Physics

General Principles in the Working of Telegraphs, Telephone MCQ Questions


1.
Who is credited with inventing the electric telegraph?
A.
Samuel Morse
B.
Alexander Graham Bell
C.
Nikola Tesla
D.
Guglielmo Marconi
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ANSWER :
A. Samuel Morse
2.
What year was the first successful telegraph message sent?
A.
1837
B.
1844
C.
1851
D.
1861
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ANSWER :
B. 1844
3.
What was the content of the first Morse code message sent by Samuel Morse?
A.
"Hello, world."
B.
"What hath God wrought?"
C.
"SOS"
D.
"Message received."
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ANSWER :
B. "What hath God wrought?"
4.
What does Morse code use to represent letters and numbers?
A.
Light signals
B.
Sound pulses
C.
Dots and dashes
D.
Electrical frequencies
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ANSWER :
C. Dots and dashes
5.
Which two cities were connected by the first long-distance telegraph line in the United States?
A.
New York and Washington, D.C.
B.
Baltimore and Washington, D.C.
C.
Boston and Philadelphia
D.
Chicago and St. Louis
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ANSWER :
B. Baltimore and Washington, D.C.
6.
What device is used to decode Morse code signals in a telegraph system?
A.
Decoder
B.
Receiver
C.
Translator
D.
Interceptor
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ANSWER :
B. Receiver