General Science and Technology Quiz

Chester Carlson invented the xerographic process in 1938, which became the foundation for Xerox copying machines. His invention revolutionized document duplication. False would be incorrect.

Alexander Graham Bell invented the telephone in 1876 and patented it. Thomas Edison invented the light bulb, James Watt improved the steam engine, and Charles Darwin proposed evolution theory.

The adult human body has 206 bones. This number decreases from 270+ at birth due to bone fusion during development. Options A (990), C (106), and D (200) are all incorrect.

Nicolaus Copernicus formulated the heliocentric model (earth revolves around sun) in the 16th century. Newton discovered gravity, Dalton proposed atomic theory, and Einstein developed relativity.

A seismograph measures earthquake intensity and records seismic waves. Barometer measures air pressure, hydrometer measures liquid density, and polygraph detects lies.

Blood group O individuals can only receive from O group because they have both anti-A and anti-B antibodies. They are universal donors but can only accept from their own type.

Oxygen is essential for combustion (burning) as it supports the fire triangle. Carbon, aluminum, and nitrogen are not required for the burning process.

The ozone layer in the stratosphere absorbs harmful UV radiation, protecting life on Earth. Nitrogen and oxygen make up most of the atmosphere but don't block UV, while CO2 contributes to greenhouse effect.

Blood appears red due to hemoglobin, an iron-containing protein in red blood cells that binds oxygen. Hemoglobin's iron atoms reflect red light, giving blood its characteristic color. The other options are incorrect: red and white pigments are nonspecific, while chlorophyll is the green pigment in plants, not found in blood.

PSLV stands for Polar Satellite Launch Vehicle, an ISRO rocket designed to launch satellites into polar orbits. 'Public', 'Pulsar', and 'People' are incorrect expansions.

PSLV primarily launches satellites into Geostationary Transfer Orbit (GTO), despite its name emphasizing polar capability. Polar sun-synchronous is also common but GTO is the standard transfer orbit for communication satellites. 'Equitorial' and 'Oceanstationary' are not standard orbit terms.

STUDSAT (Student Satellite) was developed by Indian engineering students and launched by PSLV in 2010. It was India's first pico-satellite built by students. 'Studentsat', 'Studysat', and 'Indsat' are not the correct names.

PSLV has had 2 total failures: the inaugural flight in 1993 and one partial failure in 2017 (PSLV-C39 IRNSS-1H). It has maintained over 95% success rate across 50+ missions, making it one of the world's most reliable launch vehicles.

The Windows key + M keyboard shortcut immediately minimizes all open windows to the taskbar, providing a quick way to clear your desktop. This is different from Windows + D which shows the desktop. The 'M' stands for minimize, making it easy to remember.

Windows key + F opens the search/find files function in Windows Explorer, allowing you to quickly search for files and folders on your computer. This is a direct shortcut to the search feature without having to open Explorer first. The 'F' stands for find or search.

F6 is a specialized navigation key that cycles through different panes or sections within Windows Explorer and other multi-pane applications. This helps users move between the folder tree, file list, and address bar without using the mouse. It's particularly useful for keyboard-only navigation.

The Alt + Shift + PrintScreen combination is a Windows accessibility shortcut that toggles High Contrast mode, making the screen easier to see for users with visual impairments. This is not related to printing documents despite the PrintScreen key in the combination. It's an important accessibility feature in Windows.