General Knowledge MCQ for Competitive Exams

Gerhard Armauer Hansen, a Norwegian physician, is credited with the discovery of the bacterium that causes leprosy. In 1873, Hansen identified and described Mycobacterium leprae, the bacterium responsible for leprosy (also known as Hansen's disease). His discovery was a significant contribution to the understanding of the disease, enabling further research into its causes, transmission, and treatment.

The discovery of the North Pole is attributed to American explorer Robert Peary. On April 6, 1909, Peary, along with his assistant Matthew Henson and a team of Inuit guides, claimed to have reached the North Pole. Their expedition involved a combination of overland travel and sledging across the Arctic ice. While Peary's achievement has been debated and faced controversies, he is generally acknowledged as one of the first individuals to reach the North Pole, as per the records of his expedition.

Joseph Aspdin, an English bricklayer and mason, is credited with the invention of modern Portland cement. In 1824, Aspdin patented a process for producing a hydraulic cement by burning finely ground limestone and clay together. The resulting product, which he named "Portland cement" due to its resemblance to Portland stone, became a key component in the construction industry.

Aspdin's innovation marked a significant development in the production of cement, and Portland cement remains the most widely used type of cement in the world for various construction applications.

The electron microscope was co-invented by Max Knoll and Ernst Ruska in 1931. This revolutionary microscopy technology uses a beam of electrons to achieve much higher resolution than that of traditional light microscopes, allowing scientists to visualize extremely small structures, including individual cells and even subcellular components. The invention of the electron microscope significantly advanced the field of microscopy, enabling researchers to explore the microscopic world in unprecedented detail.

The discovery of bacteria is attributed to Antonie van Leeuwenhoek, a Dutch scientist, who observed bacteria using a simple microscope that he designed and built. In the 1670s, Leeuwenhoek made detailed observations of microorganisms, including bacteria, in samples from various sources. His pioneering work laid the foundation for the understanding of the microbial world.

After 386 and 486, Dham was the man behind the launch of processor 586, that is in 1991 he fathered the Pentium chip. In 1995, after spending 16 years in the company, he left Intel. Vinod always had an itch to do something different which brought him greatness, but there is far more he wanted to do.

The vaccine for smallpox was invented by Edward Jenner, an English physician, in 1796. Jenner's vaccine was developed using material from cowpox lesions, and the process became known as vaccination. His work laid the groundwork for the development of vaccines and vaccination as a method for preventing infectious diseases.