Practice Scientist discoveries and inventions - general awareness mcq Online Quiz (set-2) For All Competitive Exams
Q-1) Who discovered electromagnetic nature of light ?
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A theory of electromagnetism was developed by various physicists over the course of the 19th century, culminating in the work of James Clerk Maxwell, who unified the preceding developments into a single theory and discovered the electromagnetic nature of light. In classical electromagnetism, the electromagnetic field obeys a set of equations known as Maxwell’s equations.
Q-2) The photoelectric effect was discovered by
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Q-3) Planimeter is used to measure:
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A planimeter, also known as a platometer, is a measuring instrument used to determine the area of an arbitrary two-dimensional shape. They were once common, but have now largely been replaced by digital tools. The Swiss mathematician Jakob AmslerLaffon built the first modern planimeter in 1854.
Q-4) Telescope was invented by
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Q-5) Blood groups were discovered by
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The ABO blood group system is widely credited to have been discovered by the Austrian scientist Karl Landsteiner, who identified the O, A, and B blood types in 1900. He was awarded the Nobel Prize in Physiology or Medicine in 1930 for his work.
Q-6) Which apparatus is used to measure the intensity of light?
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Lux meters, also known as light meters, measure the intensity of light as perceived by the human eye with the help of photo detectors.The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. In photometry, it is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.
Q-7) The study of relation of animals and plants to their surroundings is called ________
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Ecology is defined as the study of the patterns and processes governing the abundance and distribution of organisms and their relationships to their environment. It is the science that deals with the inter-relationship between the various organisms living in an area and their relationship with physical environment.
Q-8) Match List-I with List-II and select the correct answer using the code given below the lists.
List I
List II
A. Alfred Nobel
1. Theory of Evolution
B. Alexander Fleming
2. Dynamite
C. Charles Darwin
3. Penicillin
D. Madam Curie
4. Isolation of radium
Codes: A B C D
| List I | List II |
| A. Alfred Nobel | 1. Theory of Evolution |
| B. Alexander Fleming | 2. Dynamite |
| C. Charles Darwin | 3. Penicillin |
| D. Madam Curie | 4. Isolation of radium |
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Q-9) Which is the biggest telescope of the world?
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Q-10) A recent movie titled The Man Who Knew Infinity is based on the biography of
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Q-11) Homi Bhabha Award is given for special contribution in the field of
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Q-12) Which of the following is Study of fossils ?
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Palaeontology is the study of fossils to determine the structure and evolution of extinct animals and plants and the age and conditions of deposition of the rock strata in which they are found. Body fossils and trace fossils are the principal types of evidence about ancient life.
Q-13) Who discovered electric bulb?
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Q-14) Wilhelm Roentgen invented
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Q-15) Who invented the hydrogen bomb?
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Edward Taylor was a Hungarian-American theoretical physicist, known colloquially as "the father of the hydrogen bomb.” Taylor made numerous contributions to nuclear and molecular physics, spectroscopy (the Jahn–Taylor and Renner–Taylor effects), and surface physics.
Q-16) Richter Scale is used for measuring :
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There are two ways in which scientists quantify the size of earthquakes: magnitude and intensity.
Magnitude measures the energy released at the source of the earthquake; Intensity measures the strength of shaking produced by the earthquake at a certain location. The Richter Scale is used for measuring the magnitude of earthquakes.
The magnitude value is proportional to the logarithm of the amplitude of the strongest wave during an earthquake. The mercalli scale is used to measure the intensity of earthquakes. The intensity of a quake differs greatly from place to place.
It depends upon such factors as the distance from the epicentre, the design and quality of construction of local buildings, and the type of surface beneath the buildings.
Q-17) Which scientist got the particle name for ‘mesotron’ changed to ‘meson’ ?
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When Card David Anderson discovered a new particle with a mass between that of the electron and proton, he named it 'mesoton' in a 1933 publication in the Physical Review.
However, on the advice of Professor R.A. Millikan, he changed the name to ‘mesotron’ although he (Anderson) did not agree with it.
Homi Jehangir Bhabha then sent a short paper to Nature journal in February 1939 in which he proposed the name meson. The name given by Bhabha has remained to this day and is used for a class of elementary particles.
Q-18) The principle of ‘Black hole’ was enunciated by
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Q-19) Electron was discovered by
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The electron is a subatomic particle with a negative elementary electric charge. An electron has a mass that is approximately 1/1836 that of the proton.
The intrinsic angular momentum (spin) of the electron is a half-integer value in units of h, which means that it is a fermion. Like all matter, they have quantum mechanical properties of both particles and waves, so they can collide with other particles and can be diffracted like light.
The electron was identified as a particle in 1897 by J. J. Thomson and his team of British physicists.
Q-20) Who was the leader of the team that developed the ‘Web Browser’ known as Mosaic?
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Mosaic is the web browser credited with popularizing the World Wide Web. Marc Andreessen is best known as the co-author of Mosaic, the first widely used Web browser.
He is one of only six inductees in the World Wide Web Hall of Fame announced at the first international conference on the World Wide Web in 1994.