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is an instrument which reproduces sound at a distance by means...

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Business and Commerce
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_________is an instrument which reproduces sound at a distance by means of electricity.

Answer & Solution
Correct Answer: Option B
Telephone is an instrument which reproduces sound at a distance by means of electricity. There are three types of telephone connections like direct exchange line, private branch exchange and intercom. Intercom system of communication has become very popular in our country.
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