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प्रश्न
What are fluids? Give two examples.
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उत्तर
Substances that can flow are called fluids. e.g. gases (oxygen, hydrogen), liquids (water, petrol, sulphuric acid).
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संबंधित प्रश्न
Name the terms for the process due to which a solid directly changes into its vapours.
For the following statements, say whether it describes a solid, a liquid or a gas.
Particles move about very quickly.
The molecules of each substance are identical.
Write whether the following statement is true or false.
Solids have the largest inter-molecular space.
Write whether the following statement is true or false.
There is no difference between evaporation and boiling.
Match the following
| Column A | Column B |
| (a) Solids | (i) Can flow in all directions |
| (b) Sublimation | (ii) The temperature at which a liquid changes into its gaseous state. |
| (c) Boiling point | (iii) Any number of free surfaces. |
| (d) Gases | (iv) Gaps between particles. |
| (e) Intermolecular space | (v) Changes of state from solid to gas. |
Multiple choice question.
All kinds of matter
Give two examples.
Liquid element
State the correct term from A, B, C, D, E or F in List II which represents the – change of state of matter or its relevant property from List I
| List I | List II |
| 1. Solid 'X' to a liquid 'Y' | A: Liquefaction |
| 2. Liquid 'Y' to its vapour 'Z' | B: Vaporization |
| 3. 'Z' to 'Y' | C: Melting |
| 4. 'Y' to 'X' | D: Solidification |
| 5. The temperature at which 'Y' changes to 'Z' | E: Melting Point |
| F: Boiling point |
Write scientific reasons.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
