| 91 | Acid rain contains high levels of | Sulphuric and nitric acids |
| 92 | The most important stimulant in tea leaves is | caffeine |
| 93 | The main chemical substance present in the bones and teeth of animals is | Calcium Phosphate |
| 94 | Which one of the following is the main culprit in the thinning of Ozone layer in the earth's stratosphere? | Nitrogen oxides |
| 95 | What is used in making of alloys? | Chromium |
| 96 | Which one of the following would give the highest energy per gram? | Fats |
| 97 | In blood, the percentage of water is | 0.92 |
| 98 | The waves used for sending signals to the satellite from ground station are | Micro waves |
| 99 | Wisdom teeth normally grow between the age of | 17-35 |
| 100 | The satellites which revolve in such an orbit, so that they move with earth rotation are called | Geo-stationary satellites |