Question : When did Heinrich Hertz discover the photoelectric effect and observe that shining ultraviolet light on the electrodes caused a change in voltage between them?
Option 1: 1916
Option 2: 1902
Option 3: 1990
Option 4: 1887
Correct Answer: 1887
Solution : The correct option is 1887.
In the year 1887, German physicist Heinrich Hertz made a pivotal discovery related to the photoelectric effect while researching radio waves. In the course of his experiments, Hertz utilised a spark gap consisting of two closely spaced, sharp electrodes capable of generating electric sparks to identify the presence of electromagnetic waves.
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Question : Heinrich Rudolph Hertz laid the foundation for the future development of radio, telephone and telegraph. The SI unit of ____________ was named as "hertz" in his honour.
Option 1: frequency
Option 2: heat
Option 3: light
Option 4: sound
Question : The scientist who first sent electromagnetic waves to distant places is
Option 1: James Clerk Maxwell
Option 2: Heinrich Hertz
Option 3: Thomas Alva Edison
Option 4: John Logie Baird
Question : When did the Soviet Union disintegrate into 15 independent Republics?
Option 1: 1990
Option 2: 1991
Option 3: 1992
Option 4: 1993
Question : ______ waves include visible light waves, X-rays, gamma rays, radio waves, microwaves, ultraviolet and infrared waves.
Option 1: Electromagnetic
Option 2: Mechanical
Option 3: Magnetic
Option 4: Electric
Question : Find the sum of the numbers between 550 and 700 such that when they are divided by 12, 16, and 24, leave the remainder of 5 in each case.
Option 1: 1980
Option 2: 1887
Option 3: 1860
Option 4: 1867
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