Question
| 1. | Ball & socket | (a) | Elbow |
| 2. | Saddle | (b) | Spine |
| 3. | Hinge | (c) | Thumb |
| 4. | Gliding | (d) | Hip |
| 1. | Ball & socket | (a) | Elbow |
| 2. | Saddle | (b) | Spine |
| 3. | Hinge | (c) | Thumb |
| 4. | Gliding | (d) | Hip |
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| 1. | Bulb | (a) | Conductor |
| 2. | Electroplating | (b) | Insulator |
| 3. | Pure water | (c) | Heating effect of current |
| 4. | Salt solution | (d) | Chemical effect of current |
| Column - I | Column - II | ||
| i | Friction produces | (a) | Ceiling fan |
| ii | Lubricants | (b) | Heat |
| iii | Soapy floor | (c) | Oil and grease |
| iv | Ball bearing | (d) | Rolling friction |
| v | Wheels | (e) | Less the friction |
| Magnetite | Magnetic lines |
| A tiny pivoted magnet | Natural magnet |
| Cobalt | Compass box |
| Closed curves | Ferromagnetic material |
| Bismuth | Diamagnetic material |
| Rusting | Photosynthesis |
| Electrolysis | Haber’s process |
| Thermolysis | Iron |
| Food | Brine |
| Catalysis | Decomposition of limestone |
| i | Quick lime | (a) | Calcium hydroxide |
| ii | Slaked lime | (b) | Calcium oxide |
| iii | Thermolysis | (c) | Light |
| iv | Photo chemical | (d) | Heat |

| Barometer | reduce friction |
| Increasing area of contact | Atmospheric pressure |
| Decreasing area of contact | cause of friction |
| Lubricants | increases friction |
| Irregular surface | decreases friction |