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Class 9 NCERT SCIENCE Chap 1 SOLUTION

 CHAPTER 1  MATTER IN OUR SURROUNDINGS Chapter 1 MATTER IN OUR SURROUNDINGS of SCIENCE NCERT of CLASS 9 complete solution and some important points are given. This will help student to better understand the topic and can easily solve the problems related to CHAPTER 1 MATTER IN  OUR SURROUNDINGS Class 9. SOME IMPORTANT POINTS OF CHAPTER 1  MATTER IN OUR SURROUNDINGS I) Melting point :- The temperature at which solid melts to became a liquid at the atmospheric pressure is called its melting point. II) Fusion :- The process of melting that is change of solid state into liquid states is also known as fusion. III) Latent Heat Of vapourisation:- The amount of heat energy that is required to change 1kg of liquid into gas(vapour) at its boiling point is known as latent heat of vapourisation. IV) Latent heat of Fusion :- The amount of heat energy that is required to change 1kg of solid into liquid at atmospheric pressure as its melting point is known as latent heat of Fus...
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Class 8 NCERT Science Chap 13 Solution

CHAPTER 13  SOUND Here is the answer of chapter 13 SOUND of NCERT science of class 8.The complete solution of CHAPTER 13  SOUND is given here which is prepared subject expert. Some important extra questions and important points about Chapter 13 are also given. Textbook questions:- Ques1.  Choose the correct answer.  (1)  Sound can travel through a)Gases only b)Solids only c)Liquids only d)Solids, liquids and gases  Ans 1. Solids, liquids and gases.  Ques 2) Voice of when of the following is likely           to have minimum frequency?  a)Baby girl  b)Baby boy  c)A man  d)A woman  Ans.2 Baby girl Ques 3.   In the following statements, tick 'T' against those which are true and 'F' against those which are false. a)Sound cannot travel in vaccum. (T/F) b)The number of oscillations per second of a vibrating object is called its time period. (T/F) c)If the amplitude of vibration is large, sound is fee...
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Class 7 Science NCERT Chapter 4 Solution

 CHAPTER 4 HEAT  Here is some important points and answer of chapter 4 Heat  NCERT science of class 7 which helps students to better understand topics of chapter 4 Heat. Important Points:- I) Conduction:- The process by which heat is transferred from the hotter end its colder end of an object  is known as Conduction. 2) Conductor:- Material which allow to heat pass through them easily are known as conductor. 3) Convection:- The process by which heat is transmitted in liquid and gas through any medium is known as convection. 4)Insulator:- Material which do not allow to hear pass through them easily are known as insulator. Example:- wood, plastic etc. 5) Land breeze:- During night when hot air rise from sea surface and cold air of land surface  move towards sea surface known as land breeze. 6) Radiation:- When the heat is transfer in surrounding without any medium is known as radiation. 7)Sea breeze:- During day time when cold air of sea surface move towards land ...
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