ස්මාර්ට්ෆෝන් සමීක්ෂණය

How long do you use your smartphone for lecture and study-related activities per day?

  1. 30
  2. 0
  3. 0.5
  4. 0
  5. 1
  6. 2
  7. 2
  8. 4 hours
  9. 1
  10. 20