| 41 | T.V transmission cannot cover a very large area because | the shape of the earth is spherical |
| 42 | In which country alcohol is used as fuel for vehicles? | Brazil |
| 43 | Radioactivity was first discovered by | Henri Becquerel |
| 44 | Silica is used in | Glass making |
| 45 | Bats can also fly in dark because they are capable of taking the help of | Ultrasonic Waves |
| 46 | Consider the following statements: If there was no capillarity 1. It would be impossible to use a kerosene lamp. 2. One would not be able to use a straw to consume a soft drink. 3. The blotting paper would fail to function. 4. There would have been no plants on earth. Of the statements | 1.3 and 4 are correct |
| 47 | Silicon is a (n) | Semi-conductor |
| 48 | The amount of energy required by the children of age between one to three years is | 600 K Calories |
| 49 | A lake starts freezing because of the cold atmosphere. It will first freeze | At the top surface |
| 50 | A slow-running pendulum clock can be speeded up by | Reducing the length of the rod |