| 11 | Radioactivity was first discovered by | Henri Becquerel |
| 12 | While dusting a carpet, we give a sudden jerk or beat it with a stick, because | Inertia of motion removes the dust |
| 13 | The large plates of solar pannes are painted | Black |
| 14 | The primary function of the feathers in birds is to | Provide stinking surface to the wings for flying |
| 15 | The gland which maintains body temperature is the | Thyroid gland |
| 16 | The cracking sound heard when dry hair is combed with a hard rubber comb is due to | None of the above |
| 17 | What does a Syphygmannometer measure? | Blood Pressure |
| 18 | Three dimensional image formed by laser is called | Hologram |
| 19 | The shortest bone in the human body is | Stapes |
| 20 | The waves used for sending signals to the satellite from ground station are | Micro waves |