inventions mcq questions and answers for competitive exams UPSC SSC , SSC CGL, upsc Civils , Entrance exams Online test practice online free Quiz, mock practice online
76.
For over 500 years, paper was only available and sold as single sheets. In 1902, an inventive Australian used half size sheets of paper, a bit of glue and cardboard to create the what?
90.
What now-ubiquitous device was invented by Zenith engineer Eugene Polley in 1955?
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