| 61 | Lead ball falls through water more slowly than through air because | Of the viscous force in water |
| 62 | The beautiful colour pattern exhibited by a peacock in its tail feathers are due to | Selective absorption of light |
| 63 | The rear view mirror of a motor vehicle is | Convex |
| 64 | In July 2009 first Panda was born from frozen sperm in | China |
| 65 | Most of the ozone in the atmosphere is concentrated in the | Stratosphere |
| 66 | Ball bearings are used in cycles, scooters, etc. to | Reduce the friction between the wheel and the axle |
| 67 | Detergents dissolved in water help in cleaning clothes by | Reducing the surface tension of water |
| 68 | Washing soda in water behaves like | Acidic |
| 69 | The second most abundant metal found in the earth's crust is | Iron |
| 70 | Approximately, how many times each day do our heart valves open and close normally? | 1,00,000 |