Advertisements
Advertisements
प्रश्न
Explain why, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.
उत्तर
We can move our hand easily in air because the force of attraction between the particles of air is very small, as there are large inter-molecular spaces in air. However, we can’t move our hand through a plank of wood because the force of attraction between the particles of wood, which is a solid substance, is very strong and the inter-molecular spaces are negligible. That is the reason why we can’t move our hand through a plank of wood and need a karate expert to do so.
APPEARS IN
संबंधित प्रश्न
What happens to water if it is heated and Explain the phenomenon of change of state of water.
Give reasons:
A gas can fill the whole vessel in which it is enclosed.
Give two example of the following:
The substances which sublime.
Give reason for the following.
Pure substances have fixed melting or boiling points.
When a stone is dipped in a glass containing some water, the level of water rises but when a spoon of sugar is added to it and stirred, the water level does not rise?
Fill in the blank
The physical state of a substance, which has a fixed volume but no fixed shape is _______
There are large intermolecular gaps in
Fill in the following blank with suitable words :
The smell of perfume gradually spreads across a room due to .....................
What are the two conditions for the interconversion of states of matter?
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?
