| 41 | What amount of fats give energy of 9.3 K Calories? | 1.0 gram |
| 42 | Optical fibres are the fine strands of | Glass |
| 43 | Which of the following is involved in blood clotting? | Calcium |
| 44 | The working principle of a washing machine is | Centrifugation |
| 45 | Which one of the following raw material is used in the manufacture of foam used in mattresses, cushions, etc.? | Phenol |
| 46 | The cracking sound heard when dry hair is combed with a hard rubber comb is due to | None of the above |
| 47 | The procedure of crushing the gallstones and kidney stone by laser is called | Lithotropy |
| 48 | The shortest bone in the human body is | Stapes |
| 49 | The amount of energy required by the children of age between one to three years is | 600 K Calories |
| 50 | To find the hidden secrets under the water, the ships and submarines use the | Sonar system |