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Class V - science: Solids, Liquids and Gases
One Word Answer Questions:
Q) Which state has a fixed volume and shape?
    
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Q) Which state do not have a fixed shape but have a fixed volume?
    
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Q) In which state force of attraction between the molecules is very very weak?
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Q) In which state molecules are not very close to each other due to weak force of attraction?
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Q) In which state molecules in liquids can move and slide over each other?
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Q) While heating the particles, movement increases so substance?
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Q) When we heat a substance,its size increases.The increase in size of matter is called?
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Q) In gases,the force of attraction between the molecules is very-very?
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Q) The process of change of a substance from a liquid state to a gaseous state is called?
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Q) Matter is made up of small particles called?
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Q) Explain briefly about Melting?
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Short Answer Questions:
Q) Explain about Solids?
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Q) Explain about Liquids?
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Q) Explain about Gases?
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Q) What is extraction of matter?
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Q) What is contraction of matter?
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Q) Explain briefly about Expansion of matter?
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Q) Explain briefly about Evaporation?
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Q) Explain briefly about Condensation?
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Q) Explain briefly about Freezing?
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Long Answer Questions:
Q) Explain briefly about Solids, Liquids and Gases?
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Q) Explain briefly about Condensation?
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Q) Explain briefly about Melting and Freezing with examples?
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Q) Explain about the Changes of State?
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Q) Explain briefly about Evaporation?
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Q) Explain in detail about Expansion of matter?
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Q) Explain in detail about Contraction of Matter?
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Q) Explain in detail about Solids?
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Q) Explain in detail about Liquids?
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Q) Explain in detail about Gases?
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Q) Explain in detail about Change of State of Solids,Liquids and Gases?
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Solids, Liquids and Gases
  • Practical Arrangement in Solids, Liquids & Gases.
Solids:-
  • Fixed Shape and Volume.
  • Molecules are very closely packed with a strong force of attraction.
  • Cannot move away from each other.
  • They cannot flow.
Liquids:-
  • Do not have a fixed shape but have a fixed volume, They can flow.
  • Molecules are not very close to each other due to weak force of attraction.
  • Molecules in liquids can move and slide over each other.
  • Take the shape of the container in which they are kept.
Gases:-
  • Force of attraction between the molecules is very very weak.
  • Molecules in gases are far apart from each other and free to move.
  • Gases flow easily fill the container completely in which kept.
Change of State

Evaporation:-
  • When we heat water, it changes into water vapour.
  • on heating the particles start moving faster.
  • Become free and escape into the air.
evaporation
Condensation:-
  • When steam is cooled, it condenses to form water again.
  • on cooling steam, the movement of particles become slower. They start to move close to each other.
  • They become less free to move and become loosely packed to form water.
condensation
Melting:-
  • Ice is solid. When kept in warm place, the movement of water particles in ice increases and they become free from the rigid form.
melting
Freezing:-
  • When we cool water the movement of its particles slows down.
  • They come very close to each other and pack into a rigid shape to form ice.
melting
Expansion of matter:-
  • Heat a substance, its size increases. Increase in size of matter is called expansion of matter.
  • Heating - Particles movement increases so substance expands.
  • Eg:-
  • To open a tight metal lid of a jar we dip it into hot water because the heat of water causes the lid to expand a little and it opens easily.
Contraction of Matter:-
  • If a substance is cooled, size decreases is called contraction of matter.
  • Cooling movement of particles of matter slows down space between them decreases. So matter contracts electric cables do not appear loose in winter, while they hang loosely from poles in summer.
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