Science · X-Factor Notes
Physical Properties of Materials revision notes for UPPCS Prelims.
9 revision facts
| Concept | What to remember | Asked in UPPCS |
|---|---|---|
| Liquid State | Matter in this form has no fixed shape but possesses a fixed volume. | |
| Viscosity of Liquids | Viscosity is the property of a liquid that opposes the relative movement among its different layers. Concentrated liquids like honey and glycerine have greater viscosity. | |
| Effect of Temperature on Viscosity (Liquids) | When temperature increases, the viscosity of a liquid decreases. | |
| Effect of Temperature on Viscosity (Gases) | The viscosity of gas increases by increasing the temperature. | |
| Solids | Solids lack viscosity. | |
| Gas Laws (Volume and Temperature) | If a gas is compressed to half of its original volume at 270C, it must be heated to 3270C to occupy its original volume (based on the Charles Law). | I.A.S. (Pre) 1994 |
| Concept | What to remember | Asked in UPPCS |
|---|---|---|
| Surface Tension | It is the tendency of a liquid drop to contract and occupy a minimum area. | I.A.S. (Pre) 1997 |
| Raindrop Shape | Rain drops are spherical because of surface tension. | UPPCS (Pre) 2005 |
| Concept | What to remember | Asked in UPPCS |
|---|---|---|
| Iron Floating on Mercury | The iron ball floats on mercury but gets immersed in water because the specific gravity of iron is more than that of mercury. | I.A.S. (Pre) 1993 |
