Answer: Question 8. Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to deflect. Does pure water conduct electricity? We cannot make the whole article from it because it is a very costly metal. Now test if the tester is working or not. 14.4). Question 11. Question 11. NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations. Question 5. Question 12. Question 6. The compass needle should show deflection. List the possible reasons. Chromium has a good shine, it resists scratches and is corrosion resistant. Question 11. Answer: Question 6. Do you find any difference in any one of them? (c), Question 7. What is electroplating? Objects that are electroplated are door handles, taps, rims of cycles, showers, the handlebar of cycles and bikes, gas burner, tin cans, metallic almirahs, buckles of belts, etc. (a) anode Conducting properties of liquid cannot be compared in this manner. Answer: (c) liquids only. Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Changes of colour of solutions may occur depending on what solution and electrodes are used. (c) semi-conductor The lesson covers the complete explanation of class 8 Chapter 9 Reproduction. Synthetic Fibres and Plastics. NCERT Solutions for Class 8 Maths Chapter 14 Factorisation. Class 8 Science Chapter 13 Sound. Answer: Answer: Solution: (a) Sea water These questions will test your cognizance, understanding, evaluating and mathematical skills. Water is dissociated into its constituent gases, i.e., hydrogen and oxygen. Question 4. Or, the bulb is fused? If the current in the circuit is small, how can we test its presence ? Dissolve two teaspoonfuls of copper sulphate in it. Pour one teaspoon of lemon juice or vinegar in one cap. ( ) (b) … In this activity, if the bulb does not glow, it means that either the connections of the circuit are loose or the bulb is fused or cells are used up. What are electrodes ? In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. However, if the bulb does not glow, it means that the tester is not working. Question 14. Jake three clean plastic or rubber caps of bottles. This process is known as chemical effects of current. Explain your answer. Extra Questions for Class 9 Science Chapter 10 Gravitation with Answers Solutions. An electric current can produce (a) heating effect only. How can you make a tester for testing whether a given material is a conductor or an insulator ? (d) sides of the container How would you classify lemon juice or vinegar—a good conductor or a poor conductor? Why ? Notes & Worksheet. [NCERT] Question 1. What are insulators or poor conductors? Liquid A is a better conductor than liquid B. Answer: Leave the other end free. Answer: Can you think of the possible reasons? Clean copper plates with sand paper. LED glows showing the flow of current. Add a few drops of dilute sulphuric acid to copper sulphate solution to make it more conducting. Chemical Effects of Electric Current Class 8 Extra Questions Science Chapter 14 Chemical Effects of Electric Current Class 8 Extra Questions Very Short Answer Questions Question 1. Prepare a list of objects around you that are electroplated. Give three applications of chemical effect of current. It is very important for the student to tune-in with this topic in order to understand the topics of the higher class. (a) conduction NCERT Class 6 Science Water Chapter 14 MCQ Question Answer for Preparation of Exams. (ii) liquid B is a better conductor than liquid A. Answer: Method : Question 2. Is air an insulator or conductor of electricity ? What are good conductors? Wrap copper wires around the metal caps of the carbon rods and join them to a battery (Fig. (b), Question 5. Question 14. Electroplating. Question 1. Answer: Materials which do not allow electric current to flow through them are called insulators. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. Answer: Question 4. Here is the list of Extra Questions for Class 8 Science with Answers based on latest NCERT syllabus prescribed by CBSE. Solution: NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects of Electric Current Question 2. Answer: Question 10. So she collected some rainwater in a clean glass tumbler aifd tested it using a tester. (iv) The liquid may be an insulator, i.e., a poor conductor of electricity. The Sound Class 8 NCERT solutions provide questions and answers from the NCERT books in a very detailed way. Activity 3 (NCERT Textbook, Page 174) Define the following terms. Question 1. The bulb does not glow because distilled water is an insulator, since it does not have dissolved salts. Add a teaspoonful of salt or a few drops of lemon juice to water to make it more conducting. Question 7. Free PDF download of NCERT Solutions for Class 8 Science (Chemistry) Chapter 18 - Pollution of Air and Water solved by Expert Teachers as per NCERT (CBSE) Book guidelines. Question 16. Add a few drops of lemon juice or dilute hydrochloric acid to distilled water in one cap. Answer: Answer: How should LED be connected ? Now that you are provided all the necessary information regarding CBSE Class 8 Science Worksheet and we hope this detailed article is helpful. [NCERT]. Which properties of chromium make it useful for electroplating on iron ? Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? On passing electric current through the conducting solution of lemon juice and water, chemical reaction takes place. may be the current is so weak that it does not heat the filament of the bulb allowing it to glow. Answer: The bulb may not glow because of the following reasons: What can be the possible reasons for this ? In the Science book, you can also find the basic experiments that you can do with light. The disposal of the used conducting solution after electroplating is hazardous and can cause environmental pollution. (b) Alcohol Use plating artificial jewellery with gold. Answer: If not, what can we do to make it conducting ? Leave your worries of acing the exams and refer to these guides to understand difficult concepts of Chemical Effects of Electric Current with ease. Observe the electrodes carefully. In containers, water evaporates slowly. Answer: Thus food, stored in iron cans, is prevented from being spoilt due to iron by electroplating it by tin. Which one of the following is a weak electrolyte ? The free copper gets deposited on the plate acting as cathode. Question 3. Why are LEDs more useful for testing the flow of electric current ? A tester is used to check the conduction of electricity through two liquids, labelled A and B. Subtopics of Class 8 Science Chapter 14 Chemical Effects of Electric Current. … The thick rod of impure copper plate is to be attached to the positive terminal of the battery because when electric current is passed through the copper sulphate solution, it gets dissociated into copper and sulphate. In each case observe whether the magnetic needle shows deflection or not. Noise pollution, its causes, impacts, and control measures are explained towards the finish off the chapter. Answer: This chapter will strengthen your base for future complex topics. Answer: Question 11. (c) Sodium chloride Take another piece of wire and connect it to the other terminal of the battery (Fig. Question 4. Explain the process of electroplating of copper. The free copper gets drawn to the plate connected to the negative terminal of the battery and gets deposited on that plate. During electroplating, the silver metal from the anode is deposited on the cathode. By volume of hydrogen gas is twice the volume of oxygen gas. Question 5. Answer: Answer: Question 2. [NCERT] of distilled water in a clean and dry beaker. Air is an insulator of electricity. Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. Answer: The NCERT Class 8 Science Chapter 14 Question Answer guide further offers students some details on why they shouldn’t use their bare hands while performing different tests. … Note down the terminal of the battery with which this electrode is connected. Protection of the surface of bases metals which corrode for e.g., iron is plated with chromium. Answer: Question 3. A child staying in a coastal region test the drinking water and also the seawater with his tester. (c) Dilute sulphuric acid Do Liquids Conduct Electricity? No, pure water doesn’t conduct electricity. Answer: The bulb in the tester does not glow when current is passed through it. (a) Aluminium Can you explain the reason ? Question 7. Answer: (c) cathode A tester is used to check the conduction of electricity through two liquids, labelled A and B. (d) semi-insulator To her surprise she found that the compass needle showed deflection. Answer: Connect the negative terminal of battery to the metal sheet. (d) electro refining It is concluded that when electric current is passed through the copper sulphate solution, copper sulphate dissociates into copper and sulphate. The seawater contains a huge amount of salts in comparison to drinking water, hence the seawater is a better conductor of electricity and it produces a stronger magnetic field in the wire and hence deflects the compass needle more. Given here is the complete explanation of the lesson, along with all the exercises, Question and Answers given at the back of the lesson. 14.1. The bulb does not glow even though the circuit is complete because the current is too small. Living Science 2019, 2020 Solutions for Class 8 Science Chapter 14 - Some Natural Phenomena Living Science 2019, 2020 Solutions for Class 8 Science Chapter 15 - Chemical Effects of Electric Current Living Science 2019, 2020 Solutions for Class 8 Science Chapter 16 - Reflection of Light It gets deposited on the What is the disadvantage of electroplating done in the factories ? Activity 2 (NCERT Textbook, Page 773) You can now go through the concise explanations offered in these, to get the utmost clarity on different concepts under the chapter Chemical Effects of Electric Current. Dinesh can study the chemical effect of current at home very easily. Gradually, a layer of copper builds up on the plate. Conductors : lemon juice, tap water. Class 9 Science Chapter 10 Extra Questions and Answers Gravitation. Answer: Question 12. If it is still not working then replace the cells with fresh cells. Test which solutions conduct electricity and which do not. (Instead of carbon rods, you may take two iron nails about 6 cm long.) (a) magnetic energy into chemical energy Electric current can produce magnetic effect also. Answer: What is CFL ? (iii) The cells may be used up. How can the magnetic effect be used as a tester ? We have provided Chemical Effects of Electric Current Class 8 Science MCQs Questions with Answers to help students understand the concept very well. There are specific disposal guidelines for environmental protection. Question 9. Question 6. What is the basic principle of electric pen ? Question 7. In case of a fire, before the firemen uses the water hoses, they shut off the main electrical supply for the area. Answer: You would conclude that The possible reasons for this are : Question 4. Browse further to download free CBSE Class 8 Science Worksheets PDF. Answer: Question 10. Explain. Bridges and automobiles are prevented from rusting by plating them with zinc. LED is Light Emitting Diode. The NCERT Class 8 Science important questions come from this chapter. Answer: Answer: This shows that distilled water does not conduct electricity. NCERT Solutions Class 8 Science Chapter 18 Pollution of Air and Water – Here are all the NCERT solutions for Class 8 Science Chapter 18.This solution contains questions, answers, images, explanations of the complete chapter 18 titled Pollution of Air and Water From of Science taught in class 8. 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