quizzes: expand all 35 quizzes to 15 questions each

OPS-1 through OPS-10, OS-2, OS-3 went from 5 → 15.
OS-1, OS-4 through OS-11, SEC-1 through SEC-11, TRB-1 through TRB-4 went from 7 → 15.
Questions cover exam-weight scenarios not duplicated from original content.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

quizzes/OS-2-quiz.md

@@ -42,6 +42,76 @@ B. `shutdown /r /o /t 0`
 C. `sfc /scannow`  
 D. `ipconfig /release`  
 
+6. A technician needs to boot a PC from USB to run Windows setup. What must be configured first?
+
+A. Asset tag  
+B. Boot order in BIOS/UEFI  
+C. Screensaver timer  
+D. Display brightness  
+
+7. Which Windows recovery option restores the system to factory state while keeping personal files?
+
+A. System Image Recovery  
+B. Reset This PC — Keep My Files  
+C. Disk Cleanup  
+D. Secure Boot  
+
+8. A boot sector error appears after a Windows update. Which command sequence is most appropriate?
+
+A. `sfc /scannow` then `chkdsk`  
+B. `ipconfig /release` then `/renew`  
+C. `bootrec /fixmbr` then `bootrec /rebuildbcd`  
+D. `diskpart` then `format`  
+
+9. What is the purpose of WinRE (Windows Recovery Environment)?
+
+A. Manage print queues  
+B. Provide recovery tools when Windows cannot start normally  
+C. Update device drivers remotely  
+D. Configure screen resolution  
+
+10. A technician needs to perform a clean install but has no DVD drive. What is the best alternative boot method?
+
+A. Plug in an external monitor  
+B. Boot from a bootable USB flash drive  
+C. Use Bluetooth pairing  
+D. Enable Secure Boot without media  
+
+11. Which Windows recovery option completely removes all personal files and reinstalls Windows?
+
+A. System Restore  
+B. Startup Repair  
+C. Reset This PC — Remove Everything  
+D. System Information  
+
+12. After a failed Windows update, a technician wants to remove the update that caused the issue. Which tool should they use?
+
+A. Device Manager  
+B. Windows Update history in Settings  
+C. Resource Monitor  
+D. Task Scheduler  
+
+13. What does a system image backup contain?
+
+A. Only user documents  
+B. Only the OS installation files  
+C. A complete snapshot of the entire drive including OS, apps, and data  
+D. Only registry hives  
+
+14. A PC boots to a black screen with "BOOTMGR is missing." What should the technician try first?
+
+A. Disable Windows Firewall  
+B. Run Disk Cleanup  
+C. Boot from Windows media and run Startup Repair  
+D. Change the screensaver  
+
+15. Which Advanced Startup Options tool rolls back to a previous restore point?
+
+A. Command Prompt  
+B. System Restore  
+C. Task Manager  
+D. Memory Diagnostic  
+
 ## Answer Key For Instructor
 
 1. C
@@ -49,4 +119,14 @@ D. `ipconfig /release`
 3. D
 4. C
 5. B
+6. B
+7. B
+8. C
+9. B
+10. B
+11. C
+12. B
+13. C
+14. C
+15. B