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/OPS-8-quiz.md

@@ -42,6 +42,76 @@ B. Test and review the script
 C. Delete all backups  
 D. Disable rollback  
 
+6. Which scripting language is built into Windows and designed specifically for system administration?
+
+A. Python  
+B. Bash  
+C. Ruby  
+D. PowerShell  
+
+7. A technician writes a script that loops through a list of computers and installs an agent on each one. Which concept does this demonstrate?
+
+A. Manual installation  
+B. Automation through scripting  
+C. Physical deployment  
+D. Manual network mapping  
+
+8. What is a variable in a script?
+
+A. A fixed hardware setting  
+B. A named storage location for a value used in the script  
+C. A type of network cable  
+D. A drive partition type  
+
+9. A Bash script begins with `#!/bin/bash`. What is the purpose of this line?
+
+A. It comments out the first line  
+B. It specifies which interpreter should run the script  
+C. It encrypts the script  
+D. It sets the working directory  
+
+10. A technician downloads a script from an untrusted website and runs it. What is the primary risk?
+
+A. The script may update drivers automatically  
+B. The script may execute malicious commands with the user's permissions  
+C. The script may slow internet speed slightly  
+D. The script may change the desktop background  
+
+11. A PowerShell script fails with an execution policy error. What is the likely cause?
+
+A. The script has a syntax error  
+B. PowerShell execution policy is set to Restricted  
+C. The script file is on a network drive  
+D. The screen saver is active  
+
+12. In a batch script, what does `echo off` do?
+
+A. Turns off the monitor  
+B. Suppresses the display of commands as they run  
+C. Deletes output files  
+D. Disables all error messages  
+
+13. Which Windows environment variable stores the path to the current user's home folder?
+
+A. `%SYSTEMROOT%`  
+B. `%PATH%`  
+C. `%USERPROFILE%`  
+D. `%APPDATA%`  
+
+14. A Bash script needs to run a command as root. Which prefix enables this?
+
+A. `run`  
+B. `admin`  
+C. `sudo`  
+D. `root`  
+
+15. Which cmdlet in PowerShell retrieves information about running processes?
+
+A. `Get-Service`  
+B. `Get-EventLog`  
+C. `Get-Process`  
+D. `Get-Item`  
+
 ## Answer Key For Instructor
 
 1. B
@@ -49,4 +119,14 @@ D. Disable rollback
 3. C
 4. A
 5. B
+6. D
+7. B
+8. B
+9. B
+10. B
+11. B
+12. B
+13. C
+14. C
+15. C