Question : What was invented by Zacharias Jansen?
Option 1: Jet engine
Option 2: Radium
Option 3: Microscope
Option 4: Electric lamp
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Correct Answer: Microscope
Solution : The correct option is Microscope.
Zacharias Janssen, a Dutch eyeglass maker, is credited with creating one of the first compound microscopes. The early microscopes had a 20–30 fold or greater magnification power. It was developed around 1600s. Usually, convex lenses are used in microscopes to magnify the image of the specimen.
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Question : Which of the following was invented by Sir Humphry Davy?
Option 1: Safety pin
Option 2: Steam engine
Option 3: Safety lamp
Option 4: X-rays
Question : Who invented the jet engine?
Option 1: Karl Benz
Option 2: Sir Frank Whittle
Option 3: Thomas savery
Option 4: Michael Faraday
Question : Postage Meter was invented by
Option 1: Fyodor Pirotsky
Option 2: Arthur Pitney
Option 3: Fritz Pfleumer
Option 4: Stephen Perry
Question : Select the option that expresses the given sentence in passive voice.
The Mesopotamians invented the decimal system.
Option 1: The decimal system was invented by the Mesopotamians.
Option 2: The decimal system is invented by the Mesopotamians.
Option 3: The decimal system is an invention of the Mesopotamians.
Option 4: The decimal system has been invented by the Mesopotamians.
Question : The number system 'Zero' was invented by
Option 1: Ramanujam
Option 2: Arybhatta
Option 3: Patanjali
Option 4: An unknown person
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