1. A substance has a definite volume but no definite shape. State whether this substance is a solid, liquid or a gas.
2. Why do solids not diffuse into one another?
3. What is matter? How is it classified?
4. How will you show that air has maximum compressibility?
5) Matter has ___________.
| 1. no mass but occupies space 2. mass but occupies no space 3. mass and occupies space 4.no mass and occupies no space |
6. Among solids, liquids and gases which one has the maximum movement of molecules, the maximum inter molecular attraction and the minimum space between molecules.
7. List two properties that liquids have in common with gases.
8. What happens when a liquid is heated?
9. Why does water boil at a lower temperature at higher altitudes?
Define latent heat of fusion and vapourization?
10. A solid that sublimes on heating is _________.
1. sodium chloride 2. copper sulphate 3. lead sulphate 4. ammonium chloride
11. Why does a desert cooler cool on a hot dry day?
12. What is difference between evaporation and boiling?
13. A sponge can be pressed easily; still it is called a solid. Why?
14. Why water vapour does have more energy than water at same temperature?
15. In gases, particles vibrate _________.
| 1. about their mean position 2. about a vertical axis 3. about a horizontal axis 4.in any direction |
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