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प्रश्न
Wipe the board with a duster and then tap the duster against the table. What do you see?
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उत्तर
When we wipe the blackboard with a duster, we see particles of chalk powder settling on the duster. When the duster is tapped against any hard surface, these particles move out of the duster and settle elsewhere. The chalk powder spreads everywhere.
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संबंधित प्रश्न
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
Name one solid, one liquid and one gaseous non-metal.
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
Define Sol and give one example.
How is scrap iron separated from a heap of waste materials in factories?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Atoms or groups of atoms having a charge are called ______.
Evaporation is always accompanied by ______ in temperature.
