GENERAL KNOWLEDGE

Detailed explanation-1: -Alexander Graham Bell is most well known for inventing the telephone. He came to the U.S as a teacher of the deaf, and conceived the idea of “electronic speech” while visiting his hearing-impaired mother in Canada.

Detailed explanation-2: -He also worked in medical research and invented techniques for teaching speech to the deaf. Bell’s extensive range of genius included patents for the telephone and telegraph, the photophone, aerial vehicles, and hydro-planes.

Detailed explanation-3: -On 7 March 1876, Bell was granted US patent 174465A, for a method of transmitting speech by telegraphy-the telephone.