| 21 | A man weighing 96 kg consists of approximately ___ litres of water | 66.5 litres |
| 22 | The beautiful colour pattern exhibited by a peacock in its tail feathers are due to | Selective absorption of light |
| 23 | A woman's voice is shriller than a man's due to | Higher frequency |
| 24 | Why are soft drinks made with chilled water rather than water at room temperature? | Chilled water attracts more carbon dioxide |
| 25 | Which part of the camera is analogue to the retina in the human eye? | Film |
| 26 | A lake starts freezing because of the cold atmosphere. It will first freeze | At the top surface |
| 27 | Radioactivity was first discovered by | Henri Becquerel |
| 28 | Which one of the following raw material is used in the manufacture of foam used in mattresses, cushions, etc.? | Phenol |
| 29 | A Fahrenheit thermometer indicates a temperature of 14°F. Its corresponding reading on the Celsius scale will be | -10°C |
| 30 | The meter installed in our homes measure electricity in | KWh |