General Science and Technology Quiz

Technically, Linux is a kernel—the core part of the operating system that manages hardware resources. While people often use 'Linux' to refer to the whole OS, in a technical context, 'Kernel' is the most precise definition.

In Windows Explorer, NUM LOCK + Plus sign (+) expands the selected folder to show its contents. ALT+ENTER shows properties. Windows Logo+L locks the computer. SHIFT+F10 opens the context menu. This keyboard shortcut is useful for navigating folder structures efficiently.

Windows Logo + D is the keyboard shortcut to minimize all windows and show the desktop. This is a handy shortcut for quickly accessing desktop icons or files. Windows Logo + E opens My Computer, and Windows Logo + F opens Search. SHIFT+F10 opens the context menu.

Windows Logo + L is the keyboard shortcut to lock the computer and switch to the login screen. This is a security feature used when stepping away from the computer. ALT+ESC doesn't lock the keyboard. F6 and ALT+SPACEBAR have other functions in Windows.

ALT+ENTER is the universal keyboard shortcut to view properties of the selected item in Windows. This works for files, folders, and shortcuts. It's equivalent to right-clicking and selecting 'Properties'. Windows Logo+E opens My Computer. SHIFT+F10 is the context menu.

NUM LOCK + Asterisk (*) in Windows Explorer expands all subfolders under the selected folder, showing the complete folder hierarchy. This is useful for seeing the entire directory structure. ALT+ENTER shows properties. CTRL+ESC opens the Start menu. ALT+F4 closes windows.

Windows Logo+BREAK is the standard keyboard shortcut to open System Properties in Windows. SHIFT+F10 opens the right-click context menu, ALT+ENTER displays properties of a selected item, and ALT+SPACEBAR opens the window control menu for the active window.

Windows Logo+F is the dedicated keyboard shortcut to open Windows Search or Find Files/Folders. Windows Logo+L locks the workstation, ALT+TAB switches between open applications, and F6 moves between panes in Windows Explorer.

In classic Internet Explorer and Windows Explorer, ALT+O opens the Favorites menu. ALT+F opens the File menu, ALT+V opens View menu, and ALT+F4 closes the application entirely.

Mercury is the only metal that is liquid at room temperature, with a melting point of approximately -38.83°C. This unique physical property makes it easily distinguishable from other metals. Option B is correct despite the typo.

Sirius has the highest apparent magnitude (brightness as seen from Earth) of any star in the night sky at -1.46. While the Sun is brighter overall, Sirius is the brightest star beyond our solar system. The other options are incorrect: Einstein did not discover stars, no star stays fixed above the North Pole (Polaris does), and stars do not make sounds detectable by radio telescopes.

Sharks are cartilaginous fish, meaning their skeleton is made of cartilage rather than bone. This makes them lighter and more flexible than bony fish. Sharks definitely have teeth (multiple rows), gills for breathing, and the option 'lever' appears to be a typo or irrelevant.

Smog is a portmanteau word formed from 'smoke' and 'fog'. It refers to a type of air pollution typically caused by exhaust emissions from vehicles and industrial smoke mixing with fog. Option C is just a playful backronym, and option D is a nonsensical chemical formula.