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Everyday Science Basic Multiple Questions and Answers.
| 46. | Which gas is used in the preparation of soft drinks? | ||
| A. | Oxygen | ||
| B. | Carbon dioxide | ||
| C. | Nitrogen | ||
| D. | Halogens | ||
| 47. | In blood, the percentage of water is | ||
| A. | 75% | ||
| B. | 85% | ||
| C. | 90% | ||
| D. | 95% | ||
| 48. | The volume percentage of nitrogen in air is | ||
| A. | 60% | ||
| B. | 67% | ||
| C. | 74% | ||
| D. | 78% | ||
| 49. | Which of the following is involved in blood clotting | ||
| A. | Sodium | ||
| B. | Magnecium | ||
| C. | Calcium | ||
| D. | Potassium | ||
| 50. | For water purification, we use | ||
| A. | Chlorine | ||
| B. | Bromine | ||
| C. | Flourine | ||
| D. | lodine | ||
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