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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.
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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.
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संबंधित प्रश्न
Give reasons:
Solids cannot be compressed.
State the general properties of a solid.
Define the following term.
Element
Write your observation and conclusion for the following:
When one of the balloons suspended to the metre scale is punctured while other remains inflated ?
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?
What is meant by 'diffusion'? Give one example of diffusion in gases.
A measuring cylinder is filled with water to a particular mark. A piece of solid is immersed inside the measuring cylinder. State why the level of water in the measuring cylinder will rise up. If the solid is removed, what will be the new level of the water in the measuring cylinder? Give a reason for your answer.
State the term which refers to the conversion of a substance on heating from.
- solid-state to liquid state
- liquid state to vapour state
- vapour state to liquid state
- liquid state to solid-state.
Fill in the blank:
The intermolecular force of attraction is ___________ in solids.
Complete the statement by filling the blank with the correct word given below.
When inter-particle space increases, the inter-particle attractive force _______________.
