Question : Which pioneer scientist used radio waves to transmit signals over distances of several kilometres in the 1890s?
Option 1: Michael Faraday
Option 2: Paul Langevin
Option 3: Guglielmo Marconi
Option 4: Pierre Weiss
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Correct Answer: Guglielmo Marconi
Solution : The correct option is Guglielmo Marconi.
Guglielmo Marconi was a trailblazing scientist who, in the 1890s, used radio waves to send signals across several kilometres. Marconi, an Italian inventor and electrical engineer, is credited with being one of the key figures in the development of radio communication technology. In 1895, Marconi successfully transmitted a radio signal spanning 1.5 miles (2.4 kilometres) in Italy. He improved his wireless telegraphy system and achieved even longer-distance transmissions in the following years.
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Question : What is the correct order of radiations in descending order of frequencies?
Option 1: Infrared > Microwaves > Radio waves > X-rays
Option 2: Radio waves > X-rays > Microwaves > Infrared
Option 3: X-rays > Infrared > Microwaves > Radio waves
Option 4: Infrared > Microwaves > X-rays > Radio waves
Question : Who invented the modern periodic table?
Option 2: Dmitri Mendeleev
Option 3: Isaac Newton
Option 4: Niels Bohr
Question : Who invented the jet engine?
Option 1: Karl Benz
Option 2: Sir Frank Whittle
Option 3: Thomas savery
Option 4: Michael Faraday
Question : Who founded the value of 'G'?
Option 1: Henry Cavendish
Option 2: Michael Faraday
Option 4: Marie Curie
Question : Which scientist suggested that the magnet must also exert an equal and opposite force on the current-carrying conductor?
Option 2: André-Marie Ampère
Option 3: Joseph Henry
Option 4: William Gilbert
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