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CLASS 8 SCIENCE CHAPTER-18 POLLUTION OF AIR AND WATER

Question 1. State the different ways in which water is contaminated.Solution :The different ways in which the water is contaminated are :(i) Industrial waste: The harmful chemical wastes, released by the industries into water sources and pollutes the water.(ii) Sewage waste: kitchen, laundry and toilet release the waste materials that are responsible for polluting water.(iii) …

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CLASS 8 SCIENCE CHAPTER-17 STARS AND SOLAR SYSTEM

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Question 1. From the following pick out, which is not the member of the solar system?(a) A satellite(b) A comet(c) An asteroid(d) A constellationSolution : (d) A constellationA constellation is not the member of the solar system. These are the group of stars that forms a recognizable shape is known as Constellation. Question 2. Which is …

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CLASS 8 SCIENCE CHAPTER – 16 LIGHT

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Question 1. Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.Solution : We cannot see objects in the dark room. But, we can see objects outside the room, in case there is a light outside the room. To see an object need light …

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CLASS 8 SCIENCE CHAPTER-15 SOME NATURAL PHENOMENA

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Question 1. Identify the one which does not charge by friction that easily?(i) An inflamed balloon(ii) A woolen cloth(iii) A plastic scale(iv) A copper rodSolution : (iv) Copper rodThe materials which are non-conducting in nature can be charged by friction easily. Copper which is a highly conducting material cannot be charged that easily. Question 2. When …

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CLASS 8 SCIENCE CHAPTER-14 CHEMICAL EFFECTS OF ELECTRIC CURRENT

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Question 1. Complete the following sentence.(a) _______, _______ and _______ are the liquids that conduct electricity.(b) _______ is the effect generated when an electric current is passed through a solution.(c)_______ is known as the process for depositing a layer of any metal on another material by the means of Electricity.Solution :(a)Acids, Bases and Salts.(b) Chemical.(c)Electroplating …

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CLASS 8 SCIENCE CHAPTER-13 SOUND

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Question 1. Choose the correct answer.Sound can travel through(a)Gases only(b)Solid only(c)Liquid only(d)Solids, liquids and gasesSolution : (d)air, liquid and solidsFor the sound to travel it requires a medium. The medium can be solids, liquids and gases which provides the medium through which sound can travel. Question 2. Voice of which of the following is likely to …

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CLASS 8 SCIENCE CHAPTER-12 FRICTION

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Question 1. Fill in the blanks.(a) Friction opposes the ______________ between the surfaces in contact with each other.(b) Friction depends on the ______________ surfaces.(c) Friction produces ______________.(d) Sprinkling of powder on the carom board__________ friction.(e) Sliding friction is ____________ than the static friction. Solution :(a) Friction opposes the relative motion between the surfaces in contact …

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CLASS 8 SCIENCE CHAPTER-11 FORCE AND PRESSURE

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Question 1. In which situations, do you need to pull or push to change the state of motion of an object? Give two examples.Solution :Following are the examples of pull force:(a) In order to open a drawer, we have to pull it. This action changes the state of motion of the drawer.(b) To draw water …

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CLASS 8 SCIENCE CHAPTER-10 REACHING THE AGE OF ADOLESCENCE

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Question 1. What is the term used for secretions of endocrine glands responsible for changes taking place in the body?Solution : The term used for secretion of endocrine glands is hormones, which is responsible for various changes taking place in the body. Question 2. Define adolescence.Solution : The period of life when the body undergoes changes, leading …

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CLASS 8 SCIENCE CHAPTER-9 REPRODUCTION IN ANIMALS

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Question 1. Explain the importance of reproduction in organism.Solution : The production of new individual form the parents is known as reproduction. Reproduction is very important as it ensures the continuation of similar kinds of individuals, generation after generation. If this process do not exist, the generation of living beings will be vanished from the earth. …

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