| 171 | Which of the following is involved in blood clotting? | Calcium |
| 172 | The heart of a normal adult human being weighs about | 300 grams |
| 173 | Detergents dissolved in water help in cleaning clothes by | Reducing the surface tension of water |
| 174 | Ptyalin is an enzyme produced in the | Salivary glands |
| 175 | Which of the following types radiations is absorbed by the upper layer of the atmosphere? | Infrared |
| 176 | After drinking contaminated water, you would be most apt to develop symptoms of | Typhoid fever |
| 177 | What is 'Stealth Technology'? | A coating which reduces the visibility of an aircraft on a radar |