Computer Software Operations

In standard Windows application keyboard shortcuts, Ctrl + Y is the shortcut key to redo an action that was undone, whereas Ctrl + Z undoes an action. Ctrl + C copies and Ctrl + V pastes text.

In Internet Explorer, Shift + Spacebar scrolls up one page at a time (the opposite of Spacebar which scrolls down). This keyboard shortcut provides quick navigation through web pages. The Spacebar alone scrolls down, so combining it with Shift reverses the direction. Alt + Down arrow and Up arrow move line by line or open select dropdowns, not page by page. The question has a typo ('shotrcut' instead of 'shortcut') but the answer is clear.

Ctrl + Ins is a standard Windows shortcut for copying selected items, equivalent to the more commonly used Ctrl + C. This shortcut works across most Windows applications including file managers, text editors, and web browsers. Shift + Ins is for paste (equivalent to Ctrl + V), Ctrl + A selects all text, and Ctrl + Home moves to the beginning of a document. The Ins (Insert) key was more prominent on older keyboards but these shortcuts remain functional.

In Internet Explorer, Mozilla Firefox, and standard web browsers, pressing the F6 function key moves the focus of the keyboard cursor directly to the address bar. F4 is used to open the address bar dropdown list in IE, while F9 and F12 serve other purposes like developer tools.

Alt + Enter is the standard keyboard shortcut to display properties of a selected object in Windows Explorer, most IDEs, and file managers. This shortcut opens the Properties dialog showing file details, permissions, and metadata. Shift+F10 typically opens context menus, Alt+Space bar shows window control menu, and Alt+right click is not a standard shortcut.

In Microsoft Excel, pressing Ctrl + ; (semicolon) inserts the current system date into the active cell. Ctrl + Shift + ; (or Ctrl + :) inserts the current time, and Ctrl + Shift + ' copies the formula from the cell above.

CTRL+PAGE DOWN is the standard Excel keyboard shortcut to navigate to the next sheet in the workbook. Option A is correct. Option B adds an unnecessary SHIFT modifier. Option C is for moving to the edge of data regions. Option D moves to cell A1 of the current sheet.

ALT+L is the keyboard shortcut that opens the Delete Sheet dialog (accessing 'Delete Sheet' from the Edit menu). Option C is correct. Options A, B, and D are not standard Excel shortcuts for sheet deletion.

SHIFT+SPACEBAR is the Excel shortcut to select the entire row of the active cell. Option B is correct. Option A (CTRL+SPACEBAR) selects the entire column. Option C selects the entire worksheet. Option D has no selection function.

CTRL+F9 minimizes or restores the workbook window. Option D is correct. Options A and C are for other functions (F10 is for menu bar, F is for Find). Option B is not a standard Excel shortcut.

ALT+ENTER creates a line break within the same cell in Excel. Option B is correct. Option A (CTRL+ENTER) fills selected cells with the current entry. Options C and D simply move the selection to different cells.

CTRL+SHIFT+PLUS SIGN inserts blank cells at the selected location, shifting existing cells as needed. Option C is correct. Options A and D describe delete/cut operations. Option B clears cell contents without removing the cells themselves.

CTRL+9 is the correct keyboard shortcut to hide selected rows in Excel. The shortcut hides the entire row(s) containing the selected cell(s). Option A's CTRL+SHIFT+( is a typo and not a valid Excel shortcut.

CTRL+' (apostrophe) copies the formula from the cell above into the active cell or Formula Bar. This is different from CTRL+" which copies the value (not formula) from above.

ALT+F8 opens the Macro dialog box in Excel, displaying all available macros. ALT+F4 closes the application, not macro-related.