Matter
ICSE · Class 8 · Physics
Flashcards for Matter — ICSE Class 8 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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Answer
Matter is something which occupies space, has mass and can be perceived by our senses. Examples include air, water, iron, hydrogen, oxygen, milk, oil, sugar, and salt.
Who was Maharishi Kanada, and what idea did he give about matter?
Answer
Maharishi Kanada was an ancient Indian philosopher who considered matter to be made up of tiny particles called anu.
What is a molecule?
Answer
A molecule can exist free in nature and it has all the properties of that substance. A molecule is the basic unit of matter.
How big is a molecule?
Answer
A molecule is of size nearly 10^-10 metre. It is too small to be seen even with a microscope.
What is the force of cohesion?
Answer
The force of attraction between molecules of the same substance is called force of cohesion.
What is the force of adhesion?
Answer
The force of attraction between molecules of two different substances is called force of adhesion.
A substance has molecules separated by more than 10^-9 metre. What happens to the inter-molecular force?
Answer
The inter-molecular force becomes ineffective beyond a separation of 10^-9 metre and vanishes.
Why are liquids able to flow?
Answer
Liquids can flow because the molecular forces of attraction in them are weaker than in solids, so the molecules can move within the boundary of the vessel.
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