📊 PHP Performance MCQ Test
🟢 Basic Level
1. What is the main purpose of caching in PHP?
A. Increase database size
B. Reduce execution time
C. Increase server load
D. Slow down application
✅ Answer: B
2. Which of the following is an opcode cache?
A. Redis
B. Memcached
C. OPcache
D. MySQL
✅ Answer: C
3. Which function is faster?
A. print
B. echo
C. दोनों समान
D. None
✅ Answer: B
4. What does isset() check?
A. Variable is empty
B. Variable exists and not null
C. Variable is false
D. Variable is numeric
✅ Answer: B
5. Which is better for performance?
A. include
B. require
C. require_once
D. All same
✅ Answer: C
🟡 Intermediate Level
6. Which caching is fastest?
A. File caching
B. Database caching
C. Memory caching (Redis)
D. Browser caching
✅ Answer: C
7. What is the problem with this code?
for ($i = 0; $i < count($arr); $i++)
A. Syntax error
B. Infinite loop
C. Recalculates count each iteration
D. Nothing wrong
✅ Answer: C
8. Which improves DB performance?
A. More queries
B. Indexing
C. Nested loops
D. Large data fetch
✅ Answer: B
9. What does OPcache store?
A. Database queries
B. HTML output
C. Compiled PHP bytecode
D. CSS files
✅ Answer: C
10. Which is best for session storage?
A. File
B. Cookie
C. Redis
D. URL
✅ Answer: C
🔴 Advanced Level
11. What is N+1 query problem?
A. Too many loops
B. Queries inside loop
C. Syntax error
D. Memory leak
✅ Answer: B
12. Which tool is used for profiling PHP?
A. Git
B. Xdebug
C. Apache
D. Bootstrap
✅ Answer: B
13. What is PHP-FPM used for?
A. File storage
B. Fast request handling
C. Database connection
D. CSS optimization
✅ Answer: B
14. Which header improves performance?
A. Content-Type
B. Cache-Control
C. Authorization
D. Accept
✅ Answer: B
15. What does Gzip do?
A. Encrypt data
B. Compress response
C. Cache data
D. Execute faster
✅ Answer: B
🧠 Scenario-Based MCQs
16. Website is slow due to repeated DB queries. Solution?
A. Add more queries
B. Use caching
C. Remove database
D. Restart server
✅ Answer: B
17. High server load issue. Best fix?
A. Increase loops
B. Use CDN + caching
C. Disable PHP
D. Add HTML
✅ Answer: B
18. Large API response delay. What to do?
A. Increase response size
B. Use pagination
C. Add images
D. Remove JSON
✅ Answer: B
19. Memory limit exceeded. Fix?
A. Increase loops
B. Optimize code & unset variables
C. Add more variables
D. Ignore error
✅ Answer: B
20. Best way to improve PHP performance instantly?
A. Disable server
B. Enable OPcache
C. Add CSS
D. Use print
✅ Answer: B
🎯 Score Guide
- 18–20 → 🔥 Expert
- 14–17 → 🚀 Strong
- 10–13 → 👍 متوسط (Good)
- <10 → 📘 Need Practice
