science & technology Online Quiz - 219

Ctrl + Shift + Esc is the direct keyboard shortcut to open Task Manager in Windows, providing immediate access to monitor and manage running processes. This is faster than the alternative Ctrl + Alt + Delete method. Task Manager is essential for troubleshooting unresponsive programs and system performance issues.

A manometer is the instrument used to measure pressure, particularly gas pressure. Saccharimeter measures sugar concentration, ammeter measures electric current, and lactometer measures milk density.

Ornithology is the branch of zoology that deals with the study of birds. The term comes from the Greek word 'ornis' meaning bird. Osteology would be the study of bones.

Ole Romer first measured the speed of light in 1676 by observing the timing of Jupiter's moon Io. He noticed that the observed period of Io's orbit varied depending on Earth's distance from Jupiter, concluding that light has a finite speed. Einstein and Newton are incorrect - they worked on theoretical aspects of light, not measurement. Galileo attempted to measure light speed but failed.

Alexander Graham Bell patented the first practical telephone in 1876. John Logie Baird invented television, Thomas Edison developed the phonograph and electric light, and James Watt improved the steam engine.

Albert Einstein formulated the mass-energy equivalence principle E=mc² in 1905 as part of his special theory of relativity. This shows that mass and energy are interchangeable. Planck worked on quantum theory, Dalton on atomic theory, and Rutherford on nuclear structure.

Robert Koch discovered the bacterium Mycobacterium tuberculosis in 1882, identifying it as the cause of tuberculosis. He also developed Koch's postulates for establishing disease causation. While Koch did work on cholera too, his most famous discovery was the TB bacterium.

The Wright Brothers (Orville and Wilbur) invented and flew the first successful airplane in 1903. They made the first controlled, sustained flight of a powered, heavier-than-air aircraft. Balloons existed much earlier, and bicycles were invented by others.

Philology is the study of languages in written historical sources - it combines literary studies, history, and linguistics. It focuses on language evolution and historical texts. The other options refer to osteology (bones), myology (muscles), and architecture.

William Herschel discovered Uranus in 1781 using a telescope he built himself. This was the first planet discovered with a telescope. Copernicus developed the heliocentric model but didn't discover Uranus.

Charles Babbage designed the first mechanical computer - the Analytical Engine in the 1830s. He is called the 'father of the computer' for his pioneering work on programmable machines. Edison worked on electricity and lighting.

Henri Becquerel discovered radioactivity in 1896 while studying uranium salts. He found that they emitted radiation that could penetrate opaque materials. This discovery was fundamental to nuclear physics. Babbage is associated with computers.

William Harvey discovered the circulation of blood in 1628, demonstrating that blood circulates throughout the body in a closed system pumped by the heart. Edward Jenner developed the smallpox vaccine, and Joseph Lister introduced antiseptic surgery.

Alexander Oparin proposed the theory of chemical evolution in 1924, suggesting life arose from gradual chemical evolution in Earth's early atmosphere. His theory explained how simple organic compounds could form and eventually lead to the first living cells. Darwin proposed natural selection.

Joseph Lister pioneered antiseptic surgery in 1865 by introducing carbolic acid (phenol) to sterilize surgical instruments and clean wounds, dramatically reducing infection rates. Edward Jenner developed the smallpox vaccine, not antiseptic techniques.

A manometer is specifically designed to measure the pressure of gases, typically using a column of liquid. A barometer measures atmospheric pressure specifically, while an ammeter measures electric current.

One gram weight (gram-force) equals 981 dynes because 1 gram-force = 1 gram × 9.81 m/s^2 (standard gravity) = 981 g·cm/s^2 = 981 dynes in the CGS system.

One joule equals 10^7 ergs because 1 J = 1 kg·m^2/s^2 and 1 erg = 1 g·cm^2/s^2, so 1 J = (1000 g) × (100 cm)^2/s^2 = 10^7 erg.