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प्रश्न
When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?
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उत्तर
The spreading of fragrance of incense stick from a corner to the whole room indicates that particles of matter keep moving from higher to lower concentration.
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संबंधित प्रश्न
Give reasons:
A gas can fill the whole vessel in which it is enclosed.
Write your observation and conclusion for the following:
When one of the balloons suspended to the metre scale is punctured while other remains inflated ?
Fill in the blank:
Liquids have no definite ............
Match the columns.
| (1) iron and gold | (a) molecules are very far apart |
| (2) melting | (b) pure substance |
| (3) intermolecular space | (c) non - metals |
| (4) compound | (d) the space between the molecules |
| (5) gases | (e) change from solid to liquid |
| (f) metals |
Name the phenomenon which cause the following change:
Disappearance of camphor.
The process by which a solid changes into a liquid is called
- freezing
- melting
- condensation
- evaporation
Fill in the blank
The physical state of a substance, which has a fixed volume but no fixed shape is _______
Which of the following statement is incorrect?
Complete the statement given below by selecting the correct word.
The space between atoms in gases is maximum while in ____ is minimum,
Give a reason why –
Solids have a definite volume & a definite shape.
