General Principles in the Working of Telegraphs, Telephone NDA Questions

NDA Physics

General Principles in the Working of Telegraphs, Telephone MCQ Questions


13.
What is the purpose of a telegraph repeater?
A.
Amplify the signal over long distances
B.
Decode Morse code
C.
Send the signal faster
D.
Encrypt the message
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ANSWER :
A. Amplify the signal over long distances
14.
Which material was primarily used for telegraph wires?
A.
Copper
B.
Aluminum
C.
Steel
D.
Iron
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ANSWER :
A. Copper
15.
How were telegraph signals originally transmitted?
A.
Light pulses
B.
Electrical impulses
C.
Sound waves
D.
Radio waves
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ANSWER :
B. Electrical impulses
16.
What was the first transatlantic telegraph cable used for?
A.
Military communication
B.
Financial transactions
C.
Weather forecasting
D.
All of the above
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ANSWER :
D. All of the above
17.
Which device replaced the telegraph for long-distance communication?
A.
Telephone
B.
Radio
C.
Television
D.
Email
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ANSWER :
A. Telephone
18.
What is the role of the operator in a telegraph system?
A.
Convert sound to signals
B.
Encode and decode messages
C.
Maintain cable connections
D.
Record data
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ANSWER :
B. Encode and decode messages