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प्रश्न
Give a reason for the We need to classify things.
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उत्तर
We need to classify things in order to distinguish them. In this way, things can be categorized and can be easily studied.
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संबंधित प्रश्न
Water at 100°C has more heat than the steam at 100°C.
Evaporation of a liquid causes cooling.
Fill in the blank
In a solid, the molecules ............................................ but they remain at their fixed positions.
Why liquids do not have definite shape?
Give a reason for the Pure substances have fixed melting or boiling points.
Fill in the blank
When a gas is cooled, its molecules .............. energy.
For the following statement, say whether it describes a solid, a liquid, or a gas.
Particles are far apart and move in all directions.
Multiple choice question.
The process by which a solid changes into a liquid is called
Select natural and man-made matter from the following list:
Wood, plastic, silk, medicines, detergents, coal, water, ceramic, cotton, glass, nylon, fruits.
Match the following
| Column A | Column B | ||
| a | Solids | 1 | Can flow in all directions |
| b | Sublimination | 2 | The temperature at which a liquid changes into its gaseous state |
| c | Boiling Point | 3 | Can have any number of free surfaces |
| d | Gases | 4 | Gaps between particles |
| e | Intermolecular space | 5 | Change of state from solid to gas |
