Ncert-notes-class-9-science-chapter1 Class 9 Notes | EduRev

Created by: RUHI

Class 9 : Ncert-notes-class-9-science-chapter1 Class 9 Notes | EduRev

 Page 1


9 
 
 
 
1. Particle Nature of Matter  
 
[ refer NCERT text book activities 1.1 to 1.8 ] 
? Anything that occupies space and has mass and is felt by senses is called matter. 
? Matter is the form of five basic elements the Panch tatva – air , earth ,fire , sky and 
water. 
? Characteristics of particles of matter 
? Made of tiny particles.  
? Vacant spaces exist in particles. 
? Particles are in continuous motion. 
? Particles are held together by forces of attraction. 
Q.1    Define matter. 
Q.2   What happens if you put copper sulphate crystals in water? 
 
2.  States of Matter   
 
[ refer NCERT text book activities 1.9 to 1.11 ] 
Basis of Classification of Types 
? Based upon particle arrangement 
? Based upon energy of particles 
? Based upon distance between particles 
? Five states of matter                           
 
 
 
Matter 
Solid 
Liquid  
Gas 
Plasma 
Bose-
Einstein 
condensate 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
Page 2


9 
 
 
 
1. Particle Nature of Matter  
 
[ refer NCERT text book activities 1.1 to 1.8 ] 
? Anything that occupies space and has mass and is felt by senses is called matter. 
? Matter is the form of five basic elements the Panch tatva – air , earth ,fire , sky and 
water. 
? Characteristics of particles of matter 
? Made of tiny particles.  
? Vacant spaces exist in particles. 
? Particles are in continuous motion. 
? Particles are held together by forces of attraction. 
Q.1    Define matter. 
Q.2   What happens if you put copper sulphate crystals in water? 
 
2.  States of Matter   
 
[ refer NCERT text book activities 1.9 to 1.11 ] 
Basis of Classification of Types 
? Based upon particle arrangement 
? Based upon energy of particles 
? Based upon distance between particles 
? Five states of matter                           
 
 
 
Matter 
Solid 
Liquid  
Gas 
Plasma 
Bose-
Einstein 
condensate 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
10 
 
 
(i)  SOLID 
 
(ii)  LIQUID
 
(iii)  GAS 
 
? Fixed shape and 
definite volume . 
? Not fixed shape but fixed 
volume. 
? Neither fixed shape 
nor fixed volume. 
? Inter particle distances 
are smallest. 
? Inter particle distances 
are larger. 
? Inter particle distances 
are largest. 
? Incompressible. ? Almost incompressible. ? Highly compressible. 
? High density and do 
not diffuse. 
? Density is lower than 
solids and diffuse. 
? Density is least and  
diffuse. 
? Inter particle forces of 
attraction are 
strongest. 
? Inter particle forces of 
attraction are weaker 
than solids . 
? Inter particle forces of 
attraction are weakest. 
? Constituent particles 
are very closely 
packed. 
? Constituent particles are 
less closely packed. 
? Constituent particles 
are free to move 
about. 
                                             (iv)  Plasma  (non –evaluative) 
 
? A  plasma is an ionized gas. 
? A  plasma is a very good conductor of electricity and is affected by 
magnetic fields. 
? Plasma, like gases have an indefinite shape and an indefinite 
volume. Ex. Ionized gas 
(v) Bose-Einstein condensate (non –evaluative) 
 
? A BEC is a state of matter that can arise at very low 
temperatures.  
? The scientists who worked with the Bose-Einstein 
condensate received a Nobel Prize for their work in 1995. 
? The BEC is all about molecules that are really close to each 
other (even closer than atoms in a solid). 
 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
Page 3


9 
 
 
 
1. Particle Nature of Matter  
 
[ refer NCERT text book activities 1.1 to 1.8 ] 
? Anything that occupies space and has mass and is felt by senses is called matter. 
? Matter is the form of five basic elements the Panch tatva – air , earth ,fire , sky and 
water. 
? Characteristics of particles of matter 
? Made of tiny particles.  
? Vacant spaces exist in particles. 
? Particles are in continuous motion. 
? Particles are held together by forces of attraction. 
Q.1    Define matter. 
Q.2   What happens if you put copper sulphate crystals in water? 
 
2.  States of Matter   
 
[ refer NCERT text book activities 1.9 to 1.11 ] 
Basis of Classification of Types 
? Based upon particle arrangement 
? Based upon energy of particles 
? Based upon distance between particles 
? Five states of matter                           
 
 
 
Matter 
Solid 
Liquid  
Gas 
Plasma 
Bose-
Einstein 
condensate 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
10 
 
 
(i)  SOLID 
 
(ii)  LIQUID
 
(iii)  GAS 
 
? Fixed shape and 
definite volume . 
? Not fixed shape but fixed 
volume. 
? Neither fixed shape 
nor fixed volume. 
? Inter particle distances 
are smallest. 
? Inter particle distances 
are larger. 
? Inter particle distances 
are largest. 
? Incompressible. ? Almost incompressible. ? Highly compressible. 
? High density and do 
not diffuse. 
? Density is lower than 
solids and diffuse. 
? Density is least and  
diffuse. 
? Inter particle forces of 
attraction are 
strongest. 
? Inter particle forces of 
attraction are weaker 
than solids . 
? Inter particle forces of 
attraction are weakest. 
? Constituent particles 
are very closely 
packed. 
? Constituent particles are 
less closely packed. 
? Constituent particles 
are free to move 
about. 
                                             (iv)  Plasma  (non –evaluative) 
 
? A  plasma is an ionized gas. 
? A  plasma is a very good conductor of electricity and is affected by 
magnetic fields. 
? Plasma, like gases have an indefinite shape and an indefinite 
volume. Ex. Ionized gas 
(v) Bose-Einstein condensate (non –evaluative) 
 
? A BEC is a state of matter that can arise at very low 
temperatures.  
? The scientists who worked with the Bose-Einstein 
condensate received a Nobel Prize for their work in 1995. 
? The BEC is all about molecules that are really close to each 
other (even closer than atoms in a solid). 
 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
11 
 
 
      
                                                
                                                 
                                                       (non –evaluative)? 
 
 
Q.1   A substance has a definite volume but no definite shape  ?  State whether this  
        substance is a solid , a liquid or a gas. 
Q.2  Arrange the following substances in increasing order of force of attraction between the  
         particles. (a) Milk    (b) Salt   (c) Oxygen. 
Q.3   A substance  has neither a fixed shape nor a fixed volume . State whether it is a solid ,          
        a liquid or a gas. 
Q.4 The melting point of a substance is below the room temperature . Predict its physical   
         state. 
 
 
Microscopic Explanation for Properties of Gases 
Gases are easily compressible 
because there is a great deal of 
free space between particles 
Gases flow very easily because 
the particles randomly move past 
one another.  
Gases have an indefinite shape 
and an indefinite volume because 
the particles can move past one 
another.  
Microscopic Explanation for Properties of Liquids 
Liquids are not easily compressible 
and have a definite volume because 
there is little free space between 
particles.  
Liquids have an indefinite shape 
because the particles can lide 
past one another.  
Liquids flow easily because the 
particles can move/slide past 
one another.  
Microscopic Explanation for Properties of Solids
Solids have a definite shape and a 
definite volume because the 
particles are locked into place  
Solids do not flow easily because 
the particles cannot move/slide 
past one another  
Solids are not easily compressible 
because there is little free space 
between particles  
Microscopic Explanation for Properties of BEC 
Particles are less energetic than 
solids because Exist at very low 
temperature . 
Particles are literally 
indistinguishable because they 
are locked into same  space .  
BEC  shows superfluidity  because 
Particles can flow without 
friction. 
Microscopic Explanation for Properties of Plasmas 
Plasmas have an indefinite shape 
and an indefinite volume because 
the particles can move past one 
another.  
Plasmas are easily compressible 
because there is a great deal of 
free space between particles.  
Plasmas are good conductors of 
electricity  &are affected by 
magnetic fields because they are 
composed of ions 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
Page 4


9 
 
 
 
1. Particle Nature of Matter  
 
[ refer NCERT text book activities 1.1 to 1.8 ] 
? Anything that occupies space and has mass and is felt by senses is called matter. 
? Matter is the form of five basic elements the Panch tatva – air , earth ,fire , sky and 
water. 
? Characteristics of particles of matter 
? Made of tiny particles.  
? Vacant spaces exist in particles. 
? Particles are in continuous motion. 
? Particles are held together by forces of attraction. 
Q.1    Define matter. 
Q.2   What happens if you put copper sulphate crystals in water? 
 
2.  States of Matter   
 
[ refer NCERT text book activities 1.9 to 1.11 ] 
Basis of Classification of Types 
? Based upon particle arrangement 
? Based upon energy of particles 
? Based upon distance between particles 
? Five states of matter                           
 
 
 
Matter 
Solid 
Liquid  
Gas 
Plasma 
Bose-
Einstein 
condensate 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
10 
 
 
(i)  SOLID 
 
(ii)  LIQUID
 
(iii)  GAS 
 
? Fixed shape and 
definite volume . 
? Not fixed shape but fixed 
volume. 
? Neither fixed shape 
nor fixed volume. 
? Inter particle distances 
are smallest. 
? Inter particle distances 
are larger. 
? Inter particle distances 
are largest. 
? Incompressible. ? Almost incompressible. ? Highly compressible. 
? High density and do 
not diffuse. 
? Density is lower than 
solids and diffuse. 
? Density is least and  
diffuse. 
? Inter particle forces of 
attraction are 
strongest. 
? Inter particle forces of 
attraction are weaker 
than solids . 
? Inter particle forces of 
attraction are weakest. 
? Constituent particles 
are very closely 
packed. 
? Constituent particles are 
less closely packed. 
? Constituent particles 
are free to move 
about. 
                                             (iv)  Plasma  (non –evaluative) 
 
? A  plasma is an ionized gas. 
? A  plasma is a very good conductor of electricity and is affected by 
magnetic fields. 
? Plasma, like gases have an indefinite shape and an indefinite 
volume. Ex. Ionized gas 
(v) Bose-Einstein condensate (non –evaluative) 
 
? A BEC is a state of matter that can arise at very low 
temperatures.  
? The scientists who worked with the Bose-Einstein 
condensate received a Nobel Prize for their work in 1995. 
? The BEC is all about molecules that are really close to each 
other (even closer than atoms in a solid). 
 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
11 
 
 
      
                                                
                                                 
                                                       (non –evaluative)? 
 
 
Q.1   A substance has a definite volume but no definite shape  ?  State whether this  
        substance is a solid , a liquid or a gas. 
Q.2  Arrange the following substances in increasing order of force of attraction between the  
         particles. (a) Milk    (b) Salt   (c) Oxygen. 
Q.3   A substance  has neither a fixed shape nor a fixed volume . State whether it is a solid ,          
        a liquid or a gas. 
Q.4 The melting point of a substance is below the room temperature . Predict its physical   
         state. 
 
 
Microscopic Explanation for Properties of Gases 
Gases are easily compressible 
because there is a great deal of 
free space between particles 
Gases flow very easily because 
the particles randomly move past 
one another.  
Gases have an indefinite shape 
and an indefinite volume because 
the particles can move past one 
another.  
Microscopic Explanation for Properties of Liquids 
Liquids are not easily compressible 
and have a definite volume because 
there is little free space between 
particles.  
Liquids have an indefinite shape 
because the particles can lide 
past one another.  
Liquids flow easily because the 
particles can move/slide past 
one another.  
Microscopic Explanation for Properties of Solids
Solids have a definite shape and a 
definite volume because the 
particles are locked into place  
Solids do not flow easily because 
the particles cannot move/slide 
past one another  
Solids are not easily compressible 
because there is little free space 
between particles  
Microscopic Explanation for Properties of BEC 
Particles are less energetic than 
solids because Exist at very low 
temperature . 
Particles are literally 
indistinguishable because they 
are locked into same  space .  
BEC  shows superfluidity  because 
Particles can flow without 
friction. 
Microscopic Explanation for Properties of Plasmas 
Plasmas have an indefinite shape 
and an indefinite volume because 
the particles can move past one 
another.  
Plasmas are easily compressible 
because there is a great deal of 
free space between particles.  
Plasmas are good conductors of 
electricity  &are affected by 
magnetic fields because they are 
composed of ions 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
12 
 
 
 
3.Interchange in states of matter  
[ refer NCERT text book activities 1.12 to 1.14 ] 
      Matter Can Change its State 
      Water can exist in three states of matter – 
      • Solid, as ice , 
      • Liquid, as the familiar water, and 
      • Gas, as water vapour. 
Sublimation : The changing of solid directly into vapours on heating  & vapours  into solid on 
cooling. Ex. Ammonium chloride , camphor & iodine. 
        a)  Effect of change in temperature 
            The temperature effect on heating a solid varies depending on the nature of the solid        
             &  the  conditions required in bringing the change . 
? On increasing the temperature of solids, the kinetic energy of the particles increases 
which overcomes the forces of attraction between the particles thereby solid melts 
and is converted to a liquid. 
?  The temperature at which a solid melts to become a liquid at the atmospheric 
pressure is called its melting point. 
? The melting point of ice is 273.16 K.  
? The process of melting, that is, change of solid state into liquid state is also known as 
fusion. 
      b) Effect of Change of Pressure 
? Increasing or decreasing the pressure can change the state of matter. Applying   
pressure and reducing temperature can liquefy gases. 
 
? Solid carbon dioxide (CO
2
) is stored under high pressure. Solid CO
2 
 gets converted 
directly to gaseous state on decrease of pressure to 1 atmosphere without coming 
into liquid state. This is the reason that solid carbon dioxide is also known as dry ice. 
Latent Heat :  
The hidden heat which breaks the force of attraction between the molecules   during  
change of state. 
 
 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
Page 5


9 
 
 
 
1. Particle Nature of Matter  
 
[ refer NCERT text book activities 1.1 to 1.8 ] 
? Anything that occupies space and has mass and is felt by senses is called matter. 
? Matter is the form of five basic elements the Panch tatva – air , earth ,fire , sky and 
water. 
? Characteristics of particles of matter 
? Made of tiny particles.  
? Vacant spaces exist in particles. 
? Particles are in continuous motion. 
? Particles are held together by forces of attraction. 
Q.1    Define matter. 
Q.2   What happens if you put copper sulphate crystals in water? 
 
2.  States of Matter   
 
[ refer NCERT text book activities 1.9 to 1.11 ] 
Basis of Classification of Types 
? Based upon particle arrangement 
? Based upon energy of particles 
? Based upon distance between particles 
? Five states of matter                           
 
 
 
Matter 
Solid 
Liquid  
Gas 
Plasma 
Bose-
Einstein 
condensate 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
10 
 
 
(i)  SOLID 
 
(ii)  LIQUID
 
(iii)  GAS 
 
? Fixed shape and 
definite volume . 
? Not fixed shape but fixed 
volume. 
? Neither fixed shape 
nor fixed volume. 
? Inter particle distances 
are smallest. 
? Inter particle distances 
are larger. 
? Inter particle distances 
are largest. 
? Incompressible. ? Almost incompressible. ? Highly compressible. 
? High density and do 
not diffuse. 
? Density is lower than 
solids and diffuse. 
? Density is least and  
diffuse. 
? Inter particle forces of 
attraction are 
strongest. 
? Inter particle forces of 
attraction are weaker 
than solids . 
? Inter particle forces of 
attraction are weakest. 
? Constituent particles 
are very closely 
packed. 
? Constituent particles are 
less closely packed. 
? Constituent particles 
are free to move 
about. 
                                             (iv)  Plasma  (non –evaluative) 
 
? A  plasma is an ionized gas. 
? A  plasma is a very good conductor of electricity and is affected by 
magnetic fields. 
? Plasma, like gases have an indefinite shape and an indefinite 
volume. Ex. Ionized gas 
(v) Bose-Einstein condensate (non –evaluative) 
 
? A BEC is a state of matter that can arise at very low 
temperatures.  
? The scientists who worked with the Bose-Einstein 
condensate received a Nobel Prize for their work in 1995. 
? The BEC is all about molecules that are really close to each 
other (even closer than atoms in a solid). 
 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
11 
 
 
      
                                                
                                                 
                                                       (non –evaluative)? 
 
 
Q.1   A substance has a definite volume but no definite shape  ?  State whether this  
        substance is a solid , a liquid or a gas. 
Q.2  Arrange the following substances in increasing order of force of attraction between the  
         particles. (a) Milk    (b) Salt   (c) Oxygen. 
Q.3   A substance  has neither a fixed shape nor a fixed volume . State whether it is a solid ,          
        a liquid or a gas. 
Q.4 The melting point of a substance is below the room temperature . Predict its physical   
         state. 
 
 
Microscopic Explanation for Properties of Gases 
Gases are easily compressible 
because there is a great deal of 
free space between particles 
Gases flow very easily because 
the particles randomly move past 
one another.  
Gases have an indefinite shape 
and an indefinite volume because 
the particles can move past one 
another.  
Microscopic Explanation for Properties of Liquids 
Liquids are not easily compressible 
and have a definite volume because 
there is little free space between 
particles.  
Liquids have an indefinite shape 
because the particles can lide 
past one another.  
Liquids flow easily because the 
particles can move/slide past 
one another.  
Microscopic Explanation for Properties of Solids
Solids have a definite shape and a 
definite volume because the 
particles are locked into place  
Solids do not flow easily because 
the particles cannot move/slide 
past one another  
Solids are not easily compressible 
because there is little free space 
between particles  
Microscopic Explanation for Properties of BEC 
Particles are less energetic than 
solids because Exist at very low 
temperature . 
Particles are literally 
indistinguishable because they 
are locked into same  space .  
BEC  shows superfluidity  because 
Particles can flow without 
friction. 
Microscopic Explanation for Properties of Plasmas 
Plasmas have an indefinite shape 
and an indefinite volume because 
the particles can move past one 
another.  
Plasmas are easily compressible 
because there is a great deal of 
free space between particles.  
Plasmas are good conductors of 
electricity  &are affected by 
magnetic fields because they are 
composed of ions 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
12 
 
 
 
3.Interchange in states of matter  
[ refer NCERT text book activities 1.12 to 1.14 ] 
      Matter Can Change its State 
      Water can exist in three states of matter – 
      • Solid, as ice , 
      • Liquid, as the familiar water, and 
      • Gas, as water vapour. 
Sublimation : The changing of solid directly into vapours on heating  & vapours  into solid on 
cooling. Ex. Ammonium chloride , camphor & iodine. 
        a)  Effect of change in temperature 
            The temperature effect on heating a solid varies depending on the nature of the solid        
             &  the  conditions required in bringing the change . 
? On increasing the temperature of solids, the kinetic energy of the particles increases 
which overcomes the forces of attraction between the particles thereby solid melts 
and is converted to a liquid. 
?  The temperature at which a solid melts to become a liquid at the atmospheric 
pressure is called its melting point. 
? The melting point of ice is 273.16 K.  
? The process of melting, that is, change of solid state into liquid state is also known as 
fusion. 
      b) Effect of Change of Pressure 
? Increasing or decreasing the pressure can change the state of matter. Applying   
pressure and reducing temperature can liquefy gases. 
 
? Solid carbon dioxide (CO
2
) is stored under high pressure. Solid CO
2 
 gets converted 
directly to gaseous state on decrease of pressure to 1 atmosphere without coming 
into liquid state. This is the reason that solid carbon dioxide is also known as dry ice. 
Latent Heat :  
The hidden heat which breaks the force of attraction between the molecules   during  
change of state. 
 
 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
13 
 
 
 
Fusion Vaporisation 
Heat energy required to change 
1kg of solid into liquid. 
Heat energy required to change 1kg of 
liquid to gas at atmospheric pressure at 
its boiling point. 
 
Thus, we can say that pressure and temperature determine the state of a substance , 
whether it will be solid, liquid or gas. 
[ refer fig. 1.9 NCERT Text Book , page-8 ] 
Q.1   What is  vapour ? 
Q.2  Name the temperature at which the solid and liquid states of substance can exist   
         together . 
Q.3   What is the effect of pressure on boiling point? 
Q.4   Name any two substances which sublime. 
Q.5   Define Condensation.  
Q.6  For any substance, why does the temperature remain constant during the   
         change of state? 
 
4. Evaporation & Boiling 
 
? Particles of matter are always moving and are never at rest.  
? At a given temperature in any gas, liquid or solid, there are particles with different 
amounts of kinetic energy.  
? In the case of liquids, a small fraction of particles at the surface, having higher 
kinetic energy, is able to break away from the forces of attraction of other 
particles and gets converted into vapour . 
? This phenomenon of change of a liquid into vapours at any temperature below its 
boiling point is called evaporation. 
? Factors Affecting Evaporation 
? The rate of evaporation increases with an increase of surface area. 
? With the increase of temperature, more number of particles get enough kinetic  energy 
to go into the vapour state. 
? Humidity is the amount of water vapour  present in air. The air around us cannot hold 
more than a definite amount of water vapour at a given temperature. If the amount   
of water in air is already high, the rate of evaporation decreases. 
? Wind speed : the higher the wind speed , the more evaporation. 
 
 
www.ncerthelp.com
Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips,
 NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More... 
Read More

Share with a friend

Related tests

Related courses

Complete Syllabus of Class 9

Content Category

Related Searches

Semester Notes

,

Summary

,

Free

,

Extra Questions

,

ppt

,

Previous Year Questions with Solutions

,

video lectures

,

Ncert-notes-class-9-science-chapter1 Class 9 Notes | EduRev

,

EduRev Website- An Overview

,

Chapter Notes - MATHS Class 9

,

mock tests for examination

,

Exam

,

MCQs

,

practice quizzes

,

Sample Paper

,

Objective type Questions

,

study material

,

Class 9 Geography climate notes

,

past year papers

,

Ncert-notes-class-9-science-chapter1 Class 9 Notes | EduRev

,

Viva Questions

,

pdf

,

shortcuts and tricks

,

Science Class 9 Notes Sound

,

Science Class 9 Notes Sound

,

Important questions

,

Ncert-notes-class-9-science-chapter1 Class 9 Notes | EduRev

;