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प्रश्न
Give reasons for the following:
A bottle of perfume on opening evolves an odour which can be sensed over a long distance.
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उत्तर
A bottle of perfume on opening evolves an odour because gases diffuse very easily and odour spreads over a large distance.
संबंधित प्रश्न
Write your observation and conclusion for the following:
When one of the balloons suspended to the metre scale is punctured while other remains inflated ?
How will you prove by an experiment that solids occupy space ?
Fill in the blank:
Water is a matter because it has mas and occupies....................
For the following statement, say whether it describes a solid, a liquid or a gas.
Particles are far apart and move in all directions.
Match the following
| Column A | Column B |
| (a) Solids | (1) Can flow in all directions. |
| (b) Sublimation | (2) The temperature at which a liquid changes into its gaseous state. |
| (c) Boiling point | (3) Any number of free surfaces. |
| (d) Gases | (4) Gaps between particles. |
| (e) Intermolecular space | ro(5) Change of state fm solid to gas. |
How will you prove by an experiment that solids occupy space ?
Fill in the blank
Molecules in a ________ are packed very closely.
A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be taken into small particles by hammering. Which characteristic of the particles of matter is illustrated by these observations?
In a glass containing some water, tamarind juice and sugar are added and stirred well. Is this a mixture? Can you tell why? Will this solution be sweet or sour or both sweet and sour?
Which one of the following element name is not derived from planet?
