114. 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?

A. Notepad
B. Calendar
C. Notice Board
D. Telephone Book
✅ The correct answer is option A.
Birchall’s of Launceston in Tasmania started selling the world�s first notepads, calling them ‘Silvercity Writing Tablets’ after J A Birchall thought it would be a good idea to back sheets of paper with cardboard and glue them together at the top. His British paper suppliers weren�t so keen, but, they were persuaded by Birchall that it was a good idea!

119. In which decade were the first successful diode and triode vacuum tubes invented?

A. 1800s
B. 1880s
C. 1890s
D. 1900s
✅ The correct answer is option D.
In 1904, John Ambrose Fleming invented the first practical electron tube called the ‘Fleming Valve’, which is a diode rectifier. In 1906, Lee de Forest invented the audion later called the triode, which provided signal amplification.