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 Chapter 16 Light Here is the answer of chapter 16 LIGHT of NCERT science of class 8.The complete solution of CHAPTER 16 LIGHT is given here which is prepared subject expert. Some important extra questions and important points about Chapter 16 are also given. Ques1:-Suppose you are in a dark room can you see object in the room? Can you see object outside the room.Explain. Ans 1.  When we are in a dark room, we cannot see the object in the room because there is no light being reflected by the object.However, we can see the object outside the room because they reflect light falling on them. Ques2:-Differentiate between regular and diffused reflection does diffused reflection mean the failure of the law of reflection. Ans 2. In regular reflection, all the  rays that are   reflected from the surface are parallel to each other. In diffused reflection the reflected light   consists of rays that are not parallel to each other. Diffused reflection does not mea...

 CHAPTER 17 STARS AND THE SOLAR SYSTEM Here is the answer of chapter 17 STARS AND THE SOLAR SYSTEM of NCERT science of class 8.The complete solution of CHAPTER 17 STARS AND THE SOLAR SYSTEM is given here which is prepared subject expert. Some important extra questions and important points about Chapter 17 are also given. Ques 1. Why does  phases of the moon occur? Ans. We can see the moon due to the reflection of sunlight incident on it towards us. Hence, we  can see only the part of the moon  that reflects light towards us. As the position of the moon changes from day to day. Sunlight portion of the moon facing the earth changes  too and this cause the phases of moon. Ques 2. In which part of the sky can you find venus if it is visible as a evening  star? Ans. We can find venus in the western part of the sky after sunset as an evening star. Ques 3. Name the largest planet of the solar system? Ans. Jupiter is the largest planet in the solar system. Ques 4. ...

 CHAPTER 15  SOME NATURAL PHENOMENA Here is the answer of chapter 15 SOME NATURAL PHENOMENA of NCERT science of class 8.The complete solution of CHAPTER 15 SOME NATURAL PHENOMENA is given here which is prepared subject expert. Some important extra questions and important points about Chapter 15 are also given. Select the correct option in Questions 1 and 2. 1.Which of the following cannot be charged easily by Friction? a) A plastic scale. b) A copper rod. c)An inflated balloon. d) A woollen cloth. Ans. b) A copper rod Ques 2. When a glass rod is rubbed with a piece of silk cloth the rod a) and the cloth both acquire positive charge. b) becomes positively charged while the cloth has a negative charge. c) and the cloth both acquire negative charge. d) becomes negatively charged while the cloth has a  positive charge. Ans. b) becomes positively charged while the cloth has a negative charge. Ques 3. Write  T against True and F against False in the following statements. a...

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...

Chapter 12 Friction Here is the answer of chapter 12 FRICTION  of NCERT science of class 8.The complete solution of CHAPTER 12 FRICTION is given here which is prepared subject expert. Some important extra questions are also given with their answers. Textbook Questions Ques1 Fill in the blanks.  (a)  Friction opposes the ________between the surfaces in contact with each other.   b)Friction depends on the ________of surfaces.  c)Friction produces __________. d) Sprinkling of powder on the carrom board ______ friction.  e) Sliding friction is ________than the static friction.  Answers. a)Motion b)nature c)heat d )Reduces e)  Less Ques2. Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order.Their arrangements are given below. Choose the correct arrangement . a)  Rolling, static, sliding (b) Rolling, sliding, static c) Static, sliding, rolling (d) Sliding, static, rolling Ans2.c)  ...

 CHAPTER 11  FORCE AND PRESSURE Here is some important points and answer of chapter 11 FORCE AND PRESSURE NCERT science of class 8.These important points help the student to better understanding of the topic of CHAPTER 11 FORCE AND PRESSURE OF CLASS 8. The complete solution of CHAPTER 11 FORCE AND PRESSURE is given here  which is prepared subject expert. Important Points:- a) Force:- A push or pull of an object is called force. b) Nature of Force:- Force applied on an object in the same direction add to one another and if two forces acting on an object in opposite direction then the net force is the difference  of  between the two forces. c) Contact force:- When a force is applied physically through a direct contact between two object. Example:- Muscular force and Frictional Force. d) Non contact force:-  When a force is applied between bodies without being in contact with each other are known as non contact force. For example:- electrostatic force and gra...

 CHAPTER 18  POLLUTION OF AIR AND WATER Here is some important points and answer  of chapter 18   POLLUTION OF AIR AND WATER  NCERT science of class 8 which helps students to better understand the  topics of chapter. Important Points:- i) Pollution:- The contamination of any natural resources by unwanted substance or impurities is called Pollution. ii) Global warming:- Increase in the average temperature of the earth due to green house effect and other reason is called Global Warming. iii) Green house effect:- The availity of the earth's atmosphere to trap and reflect radiation of the sun is called Green house effect. iv) Air Pollution:- When air got contaminated by impurities  is known as Air pollution. v) Chemical Contimination:- The chemical which are created disturbance in environment are known as Chemical Contimination. vi) Pollutants:- Particles or substance which creates disturbances in the environment  resources such as water, soil,et...

CHAPTER 10 REACHING THE AGE OF ADOLESCENCE Chapter 10 Reaching The Age of ADOLESCENCE SCIENCE NCERT of CLASS 8 complete solution and some important points are given. This will help student to understand the topics of CHAPTER 10 REACHING THE AGE OF ADOLESCENCE of Class 8. Students can solve the textbook Questions easily and understand all the important points of chapter . Important Points:- a) Adam's apple:- At puberty, the voice box begin to grow in boys and develop as a large voice box this developed part seen at the throat known as Adam's apple. b) Adolscence:- The period of life when reproductive  maturity is growing  up is called Adolscence. c) Adernalin :- Kind of gland which release hormone  to adjust body from  when we are facing emergency situation stress. d)  Balanced Diet:-  A diet  which contain all nutritional value like carbohydrates, fats, vitamins etc.is known as balanced diet. e) Endocrine  gland:- The glands which release their se...