Discoveries & Inventions


  1. 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 They were once common, but have now largely been replaced by digital tools.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.

    Correct Option: D

    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 They were once common, but have now largely been replaced by digital tools.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.


  1. Araneology is the study of:









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    Araneology is a branch of zoology that deals with the study of spiders. It is a branch of Arachnology, the scientific study of spiders and related animals such as scorpions, pseudo-scorpions, and harvestmen, collectively called arachnids.

    Correct Option: D

    Araneology is a branch of zoology that deals with the study of spiders. It is a branch of Arachnology, the scientific study of spiders and related animals such as scorpions, pseudo-scorpions, and harvestmen, collectively called arachnids.



  1. Who discovered the link between electricity and magnetism?









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    The connection between electricity and magnetism was discovered by famous Danish chemist and physicist, Hans Christian Oersted in 1819. Starting about a decade after Oersted’s discovery, Michael Faraday demonstrated essentially the opposite of what Oersted had found–that a changing magnetic field induces an electric current. He achieved an electrical current from a changing magnetic field, a phenomenon known as electromagnetic induction. Following Faraday’s work, James Clerk Maxwell developed equations, formally unifying electricity and magnetism. So it was Maxwell who formulated the relationship between electricity and magnetism.

    Correct Option: B

    The connection between electricity and magnetism was discovered by famous Danish chemist and physicist, Hans Christian Oersted in 1819. Starting about a decade after Oersted’s discovery, Michael Faraday demonstrated essentially the opposite of what Oersted had found–that a changing magnetic field induces an electric current. He achieved an electrical current from a changing magnetic field, a phenomenon known as electromagnetic induction. Following Faraday’s work, James Clerk Maxwell developed equations, formally unifying electricity and magnetism. So it was Maxwell who formulated the relationship between electricity and magnetism.


  1. Who invented the battery?









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    In 1800, Alessandro Volta, an Italian physicist, invented the first true battery, which came to be known as the voltaic pile. The voltaic pile consisted of pairs of copper and zinc discs piled on top of each other, separated by a layer of cloth or cardboard soaked in brine (i.e., the electrolyte).

    Correct Option: B

    In 1800, Alessandro Volta, an Italian physicist, invented the first true battery, which came to be known as the voltaic pile. The voltaic pile consisted of pairs of copper and zinc discs piled on top of each other, separated by a layer of cloth or cardboard soaked in brine (i.e., the electrolyte).



  1. 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. Mercalli scale is used to measure intensity of earthquakes. The intensity of a quake differs greatly from place to place. It depends upon such factors as the distance from the epicenter, the design and quality of construction of local buildings, and the type of surface beneath the buildings.

    Correct Option: E

    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. Mercalli scale is used to measure intensity of earthquakes. The intensity of a quake differs greatly from place to place. It depends upon such factors as the distance from the epicenter, the design and quality of construction of local buildings, and the type of surface beneath the buildings.