| 131 | The longest and the strongest bone in the human body is | Femur |
| 132 | The primary function of the feathers in birds is to | Provide stinking surface to the wings for flying |
| 133 | Vinegar is prepared by the | Fermentation of rotten grapes. |
| 134 | BTU is the abreviation of | British thermal units |
| 135 | A mobile phone sends and receives messages through | Radio waves |
| 136 | Steering of a car involves | A pair of forces acting along the same line and in opposite direction |
| 137 | Approximately, how many times each day do our heart valves open and close normally? | 1,00,000 |
| 138 | Nitrogen occurs in plants and animals in the form of | Proteins |
| 139 | The snow on the mountains does not melt all at once when it is heated by the sun because | It reflects most of the heat from the sun |
| 140 | Which one of the following raw material is used in the manufacture of foam used in mattresses, cushions, etc.? | Phenol |