Practice Quiz set 4 - general awareness mcq Online Quiz (set-1) For All Competitive Exams

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.

French physicist Henri Becquerel discovered radioactivity by accident in 1896 when a piece of uranium left in a dark desk drawer made an image on photographic plates.

The husband and wife team of Pierre and Marie Curie became interested in Becquerel’s discovery. While experimenting with their own uranium-containing ore, they came up with the term “radioactivity” to describe the spontaneous emissions that they studied.

Though Gregor Mendel (1822–1884) first suggested the existence of discrete inheritable units, he did not use the term gene.

Gene was coined in 1909 by Danish botanist Wilhelm Johannsen to describe the fundamental physical and functional unit of heredity. The related word genetics was first used by William Bateson in 1905.

William Ferrel was an American meteorologist, developed theories that explained the mid-latitude atmospheric circulation cell in detail. He demonstrated that it is the tendency of rising warm air, as it rotates due to the Coriolis effect, to pull in air from more southerly, warmer regions and transport it poleward.

It is this rotation that creates the complex curvatures in the frontal systems separating the cooler Arctic air to the north from the warmer continental tropical air to the south.

Cement is a binder, a substance that sets and hardens independently, and can bind other materials together.

The word “cement” traces to the Romans, who used the term opus caementicium to describe masonry resembling modern concrete that was made from crushed rock with burnt lime as a binder.

Joseph Aspdin was a British cement manufacturer who obtained the patent for Portland cement on 21 October 1824.