Question 1:

Who is credited with inventing the Telephone?

Explanation: The Telephone was invented by Alexander Graham Bell.

Question 2:

When was the first successful telephone call made?

Explanation: The first successful telephone call was made in 1876.

Question 3:

What was the first word spoken over the telephone?

Explanation: The first word spoken over the telephone was "Hello".

Question 4:

What is the device used to convert sound waves into electrical signals in a telephone?

Explanation: The device used to convert sound waves into electrical signals in a telephone is the microphone.

Question 5:

Which company introduced the first commercial telephone exchange?

Explanation: The Bell Telephone Company introduced the first commercial telephone exchange.