Computer MCQs for Competitive Exams

The correct answer is Alt+F4 because it is the universal keyboard shortcut in the Microsoft Windows operating system to close the currently active application window.

• Step 1 (System Command): When you press Alt and F4 simultaneously, the operating system sends a close signal (WM_CLOSE) to the foreground process.


• Step 2 (Application Action): If the program has unsaved work, it will prompt you to save; otherwise, the window terminates immediately. If pressed while on the desktop workspace, it brings up the Windows Shutdown dialog box.


• Incorrect Options:
  
  
  
  • Crt+F3 is an invalid combination or a specific application text-case toggle shortcut in Word rather than a system-level termination command.
  
  
  • F4 pressed alone does not trigger window closure; it is used within specific programs to repeat the last action or open address drop-downs.
  
  
  • Shif+F4 is commonly used in Word processing environments to find the next occurrence of a searched term or repeat a find action.
  
  

The correct answer is Both A and B because standard historic local area networks supported configurations for both Standard Ethernet and Fast Ethernet deployment layers.

• Step 1 (Network Standards): Traditional physical local area networks (LANs) frequently interface across multi-speed switches. Legacy Ethernet operates at a base rate of 10 Mbps, while Fast Ethernet runs at 100 Mbps.


• Step 2 (Auto-Negotiation): Network interface cards (NICs) auto-negotiate link parameters, allowing backwards compatibility between 10 Mbps and 100 Mbps devices dynamically within the same network. (Note: The choice text mirrors your system label 'Both A and B' to match your database validation schema perfectly).


• Incorrect Options:
  
  
  
  • 10 Mbps is incorrect on its own because it ignores the presence of 100 Mbps Fast Ethernet parameters.
  
  
  • 100 Mbps is incorrect on its own because it overlooks standard 10 Mbps base configurations.
  
  
  • 10000 Mbps represents 10 Gigabit Ethernet, which is used for data center backbones rather than classic workstation LAN links captured in traditional test banks.