| 151 | The Green House Effect is caused by an excess of | Carbon dioxide |
| 152 | The human blood is divided into | Four groups |
| 153 | Water has maximum density at | 4°C |
| 154 | Which gas is commonly used in balloons and airships? | Helium |
| 155 | The beautiful colour pattern exhibited by a peacock in its tail feathers are due to | Selective absorption of light |
| 156 | Which of the following types radiations is absorbed by the upper layer of the atmosphere? | Infrared |
| 157 | Where is blood formed in the human body? | Heart |
| 158 | Recording of brain waves from outer surface of head is called | E.E.G |
| 159 | Which one of the following is a metal | Iron |
| 160 | Water is a universal solvent for what reactions? | Biochemical |