86. Who invented Gunpowder?
(a) G. Ferdinand Von Zeppelin
(b) Sir Frank Whittle
(c) Roger Bacon
(d) Leo H Baekeland
87. Who invented Fountain Pen?
(a) John J. Loud
(b) Sir Frank Whittle
(c) Lewis E. Waterman
(d) Kirkpatrick Macmillan
88. Who invented Dynamite?
(a) Sir Alexander Graham Bell
(b) Benjamin Franklin
(c) Thomas Alva Edison
(d) Alfred B. Nobel
89. Who invented Bifocal Lens?
(a) Alfred B. Nobel
(b) Thomas Alva Edison
(c) Benjamin Franklin
(d) Rudolf Diesel
90. Who invented Gramophone?
(a) Michael Faraday
(b) Fahrenheit
(c) Sir Alexander Graham Bell
(d) Thomas Alva Edison
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