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प्रश्न
When a beam of sunlight enters a room through a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases) Y which are moving rapidly in a very haphazard manner.
- What could particles X be ?
- Name the gas (or mixture of gases) Y.
- What is the phenomenon exhibited by particles X known as ?
- What is causing the movement of particles X ?
- What conclusion does the existence of this phenomenon give us about the nature of matter ?
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उत्तर
- The particles, 'X' are dust particles.
- Gas 'Y' is Air.
- This phenomenon being exhibited by 'X' particles is called the Brownian motion.
- The fast moving air molecules are constantly hitting the tiny dust particles, causing them to move rapidly in a very haphazard manner.
- The gaseous matter ‘air’ is made up of tiny particles that are constantly moving.
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संबंधित प्रश्न
Give two example of the following:
The substances which do not change their state on heating.
Write whether the following statement is true or false.
A gas has no free surface.
A substance which can change its state
- wood
- oxygen
- paper
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If an object weighs 6 kg on earth. What will be its weight on moon ?
Fill in the blank
When a gas is cooled, its molecules ________ energy,
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Which one of the following statements is not true?
- the molecules in a solid vibrate about a fixed position
- the molecules in a liquid are arranged in a regular pattern
- the molecules in a gas exert negligibly small forces on each other, except during collisions
- the molecules of a gas occupy all the space available
Differentiate the general properties of solids, liquids and gases in the form of a table — with reference to compressibility.
Fill in the blanks:
Matter is defined as anything that occupies _______ and has _______
Fill in the blank:
Particles in a gas possess ___________ kinetic energy.
