Discoveries & Inventions


  1. The instrument used for measuring air pressure is called









  1. View Hint View Answer Discuss in Forum

    A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. Pressure tendency can forecast short term changes in the weather. Evangelista Torricelli is universally credited with inventing the barometer in 1643.

    Correct Option: B

    A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. Pressure tendency can forecast short term changes in the weather. Evangelista Torricelli is universally credited with inventing the barometer in 1643.


  1. The Beaufort scale is used to measure :









  1. View Hint View Answer Discuss in Forum

    The Beaufort scale is an empirical measure for describing wind velocity based on observed sea conditions. The scale was devised in 1805 by Irish-born Francis Beaufort (later Rear Admiral Sir Francis Beaufort), a Royal Navy officer, while serving in HMS Woolwich.

    Correct Option: C

    The Beaufort scale is an empirical measure for describing wind velocity based on observed sea conditions. The scale was devised in 1805 by Irish-born Francis Beaufort (later Rear Admiral Sir Francis Beaufort), a Royal Navy officer, while serving in HMS Woolwich.



  1. The branch of biology which deals with extinct organisms is called









  1. View Hint View Answer Discuss in Forum

    Paleontology is the study of fossils and biology of extinct organisms. It is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene Epoch (roughly 11,700 years before present). Paleontology lies on the border between biology and geology, but differs from archaeology in that it excludes the study of anatomically modern humans

    Correct Option: D

    Paleontology is the study of fossils and biology of extinct organisms. It is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene Epoch (roughly 11,700 years before present). Paleontology lies on the border between biology and geology, but differs from archaeology in that it excludes the study of anatomically modern humans


  1. The growth of bacteria is measured by









  1. View Hint View Answer Discuss in Forum

    There are different methods of counting microbial growth. These are based on different parameters of cells such as dry-weight and wet-weight measurement, absorbance, cell plate, density, turbidity, ATP measurement, viable count, ATPase activity and use of Coulter counter. Absorbance is measured by using a spectrophotometer. Cell growth of any bacterial suspension at a particular wavelength at different intervals is measured in terms of absorbance.

    Correct Option: B

    There are different methods of counting microbial growth. These are based on different parameters of cells such as dry-weight and wet-weight measurement, absorbance, cell plate, density, turbidity, ATP measurement, viable count, ATPase activity and use of Coulter counter. Absorbance is measured by using a spectrophotometer. Cell growth of any bacterial suspension at a particular wavelength at different intervals is measured in terms of absorbance.



  1. An eudiometer measures









  1. View Hint View Answer Discuss in Forum

    A eudiometer is a laboratory device that measures the change in volume of a gas mixture following a physical or chemical change. Applications of a eudiometer include the analysis of gases and the determination of volume differences in chemical reactions. It is similar in structure to the meteorological barometer.

    Correct Option: C

    A eudiometer is a laboratory device that measures the change in volume of a gas mixture following a physical or chemical change. Applications of a eudiometer include the analysis of gases and the determination of volume differences in chemical reactions. It is similar in structure to the meteorological barometer.