HomeEveryday Science MCQsDisolved oxygen (DO) in water should be? 354. Disolved oxygen (DO) in water should be?By Admin / September 17, 2025 A. 400 to 800 ppm B. 4000 to 8000 ppm C. 0.4 to 0.5 ppm D. 4 to 5 ppm ✅ The correct answer is option D.
1. Which of the following does not pollute the air? Leave a Comment / Everyday Science MCQs / By Admin
2. Which of the following planets have the longest day? Leave a Comment / Everyday Science MCQs / By Admin