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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
Define interconversion of states of matter.
Classify the following into solids, liquids and gases.
Oxygen, milk, common salt, wax, stone, water vapour, carbon-dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.
True or false.
If the container in which a gas is collected has an opening, the gas will flow out and spread itself indefinitely.
Match the following columns
| Column A | Column B | ||
| A. | A molecule is composed of | i. | does not exist free in nature. |
| B. | Ice, water and water vapour | ii. | can vibrate only up to about `10^-10`m from their mean position. |
| C. | An atom | iii. | atoms. |
| D. | Gases | iv. | are the three states of water. |
| E. | The molecules of a solid | v. | occupy space |
If an object is taken to the moon from the earth what will be its mass?
Give reason :
When a teaspoon of sugar is added to half a glass of water and stirred, the water level in the glass does not rise.
Write whether the following statement is true or false.
A gas has no free surface.
Write true or false for the statement. Rewrite the false statement correctly.
Solids and liquids can flow.
Give a reason for the following:
A crystal of iodine on slow heating in a closed flask turns into vapours and fills the complete flask.
Write scientific reason.
Lemon sherbat has a sweet, sour and salty taste and it can be poured into a glass.
