| 51 | Which one of the following would give the highest energy per gram? | Fats |
| 52 | The second most abundant metal found in the earth's crust is | Iron |
| 53 | The sun appears red at sunrise and sunset while it appears white at noon, because | Of scattering of light due to dust particles and air molecules |
| 54 | A train goes past a railway station at a high speed. A young boy standing on the edge of the platform is likely to | Fall towards the train |
| 55 | The penetration of x-rays through an object depends upon the object's | Density |
| 56 | The carrier waves used for the radio transmission have frequency upto | 30 KHz |
| 57 | Scaling with steam is more severe than scaling by boiling water because | Steam contains more energy than boiling water |
| 58 | In the electricity meter, the digit to the extreme right is | 1/10th of the unit |
| 59 | Which one of the following units represents the largest amount of energy? | Calorie |
| 60 | A light year is the unit of | Distance |