Question
| 1. | Oxygen | (a) | Carbon dioxide |
| 2. | Azote | (b) | Nitrogen |
| 3. | Solvay process | (c) | Vital life |
| 4. | Gun powder | (d) | No life |
| 1. | Oxygen | (a) | Carbon dioxide |
| 2. | Azote | (b) | Nitrogen |
| 3. | Solvay process | (c) | Vital life |
| 4. | Gun powder | (d) | No life |
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| i | Conjunctiva | (a) | Coloured part of eye |
| ii | Cornea | (b) | Photosensitive layer |
| iii | Iris | (c) | Refraction |
| iv | Retina | (d) | Protection |
| 1. | Conduction | (a) | liquids and gases |
| 2. | Convection | (b) | Poor conductor |
| 3. | Radiation | (c) | Solids |
| 4. | Snow | (d) | Vacuum |
| Octane rating | Diesel |
| Cetane rating | Methane |
| Simplest hydrocarbon | Petrol |
| Peat | Bown in colour |
| Lignite | First stage coal |
| 1. | J.J. Thomson | (a) | Law of definite proportions |
| 2. | Air | (b) | Law of indestructibility of mass |
| 3. | Hydrogen ion | (c) | Poor conductor of electricity |
| 4. | Law of constant proportions | (d) | Plum pudding model |
| 5. | Law of conservation of mass | (e) | $H^+$ |
| Universal solvent | Water pollutant |
| Hard water | Kills germs |
| Boiling | Ozonisation |
| Sterilization | Water |
| Sewage | Stomach ailments |
| i | Quick lime | (a) | Calcium hydroxide |
| ii | Slaked lime | (b) | Calcium oxide |
| iii | Thermolysis | (c) | Light |
| iv | Photo chemical | (d) | Heat |
| Atom | Building block of matter |
| Element | Atoms of different kinds |
| Compound | Atoms of the same kind |
| Molecule | Smallest unit of a substance |
| i | Real image | (a) | Distance between pole and centre of curvature. |
| ii | Virtual image | (b) | Centre of the sphere of which the mirror is a part. |
| iii | Focus | (c) | Line passing through the pole and focus. |
| iv | Principal axis | (d) | Erect |
| v | Centre of curvature | (e) | Inverted |
| Barometer | reduce friction |
| Increasing area of contact | Atmospheric pressure |
| Decreasing area of contact | cause of friction |
| Lubricants | increases friction |
| Irregular surface | decreases friction |
| i | Alveoli | (a) | Yeast |
| ii | Ethanol | (b) | Gaseous exchange |
| iii | Diffusion | (c) | Amino acids |
| iv | Protein | (d) | Perfume |