(d) Nitric acid On passing electric current through the conducting solution of lemon juice and water, chemical reaction takes place. The water used in the water hoses is not pure water and is a good conductor of electricity. What do you conclude this time? Take out the ends of the tester from the lemon juice, dip them in water and then wipe them dry. Pour about two teaspoonfuls of distilled water in each of them. What are insulators ? Question 2. (iii) both liquids are equally conducting. Take the tray from inside a discarded matchbox. Copper from impure rod is sought to be transferred to the thin copper plate. Add a few drops of lemon juice or dilute hydrochloric acid to distilled water in one cap. If not, what can we do to make it conducting ? So, the deflection of the compass needle is more. Question 4. Materials which allow electric current to flow through them are called conductors. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. CBSE Science Class 8 Chapter Wise Solved Q&A . Here is the list of Extra Questions for Class 8 Science with Answers based on latest NCERT syllabus prescribed by CBSE. A tester can be made by attaching one free end of the wire to a terminal of a battery and another wire from other terminal of the battery to a bulb. Answer: The rainwater showed deflection with the tester because it is not as pure as distilled water. (b) chemical Question 2. Answer: Now that you are provided all the necessary information regarding CBSE Class 8 Science Worksheet and we hope this detailed article is helpful. (Remember to wash and wipe the ends of tester after testing each liquid). In Chapter 8 of Grade 8 Science, we have to study about few synthetic fibres like Nylon, Rayon or Artificial Silk, Polyester and Acrylic.We should know about the properties of these synthetic fibres. So she collected some rainwater in a clean glass tumbler aifd tested it using a tester. The free copper, being positively charged, gets drawn to the negative terminal of the battery and gets deposited on it. Now connect one free end of the wire to the terminal of a battery. So, the fire¬men shut off the electric supply before spraying water to save themselves and other people from electrocution. If the magnetic compass shows deflection glows, it is a conductor, but if it does not deflect, it is an insulator. Answer: What are good conductors? Question 10. Give some uses of LED. Question 3. What precautions should be observed when doing electroplating ? Reproduction Class 8 Science Chapter 9 as per NCERT Book used in CBSE and other Schools. [NCERT] Vedantu is a platform that provides free, and other study materials for students. Collect a few small plastic or rubber caps of discarded bottles and clean them. To her surprise, she found that the compass needle showed deflection. How would you classify lemon juice or vinegar—a good conductor or a poor conductor? 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. Clean copper plates with sand paper. Sound talks about the distinction between music and noise. (d) sides of the container Answer: Dip the ends of the wire in the given liquid. (i) liquid A is a better conductor than liquid B. Question 13. Answer: Answer: Clean their metal caps with sand paper. Do Liquids Conduct Electricity? In each case observe whether the magnetic needle shows deflection or not. Question 5. Answer: If the ends of the wire of tester are touched for a long time, what will happen ? Question 18. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. We should not do the experiments on electricity by using electric supply from the mains because there is large amount of current and the person using it can get electrocuted. Why are LEDs more useful for testing the flow of electric current ? You would conclude that. Why? It is concluded that when electric current is passed through the copper sulphate solution, copper sulphate dissociates into copper and sulphate. CBSE Topper Answer Sheet; CBSE Sample Papers for Class 12; CBSE Sample Papers for Class 11; ... NCERT Solutions for Class 10 Science Chapter 14; ... RD Sharma Class 8: RD Sharma Class 7: CBSE Previous Year Question Papers Class 12: CBSE Previous Year Question Papers Class 10: NCERT Books: Maths Formulas: CBSE Sample Papers: Vedic Maths . However, if the bulb does not glow, it means that the tester is not working. Question 7. (i) The wires in the circuit may be loosely connected. Repeat the activity with other liquids such as tap water, vegetable oil, milk, honey. Question 5. … Question 9. Jake three clean plastic or rubber caps of bottles. In Class 8 Science Chapter 3, the descriptions of man-made fires and their uses are given. We will need copper sulphate and two copper plates of size around 10 cm x 4 cm. (ii) liquid B is a better conductor than liquid A. (c), Question 2. If you are a student of class 8 who is using NCERT Textbook to study Science, then you must come across chapter 14 Chemical Effects of Electric Current . The liquid is a conductor and the circuit is also complete, but the bulb does not glow. The process of depositing a layer of any desired metal on another material by means of electricity is called …………. Answer: 14.4). But when salt is dissolved in distilled water and again tested, the bulb glows which shows that water containing salts conduct electricity. These questions will test your cognizance, understanding, evaluating and mathematical skills. Question 11. Question 5. Now, check the Class 8 Science Chapter 14 question answer PDF on the main website of Vedantu. The bulb does not glow because distilled water is an insulator, since it does not have dissolved salts. He finds that the compass needle deflects more in the case of seawater. This completes the circuit of the tester and the bulb should glow. The Class 8 Science Chapter 14 Solutions are now made easy to understand all the concepts and topics related to the chapter precisely. Question 1. A tester is used to check the conduction of electricity through two liquids, labelled A and B. We can test the presence of the small current by using a LED instead of the bulb. We have provided Sound Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Materials which do not allow electric current to flow through them are called insulators. Connect the negative terminal of battery to the metal sheet. Answer: What is the objective of electroplating ? Class 8 is one of the crucial stages of a student’s life. Record your observations in Table 14.1. Question 1. How can the magnetic effect be used as a tester ? Solution: Activity 6 (NCERT Textbook, Page 176) CL provides CBSE Science prep material for class 8 students. Question 14. (b), Question 5. Prepare a list of objects around you that are electroplated. What is electroplating? Question 6. Pour a cupful of water in a glass/ plastic bowl. Join the free ends of two wires momentarily. A metal is released in the electrolysis of a salt. If not, what can we do to make it conducting? Answer: Answer: of distilled water in a clean and dry beaker. Answer: Chapter 1 Crop Production and Management Class 8 Extra Questions Chapter 2 Microorganisms: Friend and Foe Class 8 Extra Questions Write its one use. Subtopics of Class 8 Science Chapter 14 Chemical Effects of Electric Current. An electric current can produce (a) heating effect only. Water is dissociated into its constituent gases, i.e., hydrogen and oxygen. Explain why these deposits occur. Decoration of articles by giving them a layer for e.g., silver plating on cutlery. If they are, then replace the bulb with another bulb. Answer: Connect the copper plates to the terminals of a battery and immerse them in copper sulphate solution (Fig. (b) electrical energy into chemical energy The sea water contains more salts dissolved in it as compared to the tap water. Answer: (a) Copper Note down the terminal of the battery with which this electrode is connected. Mark ‘T’ if the statement is true and ‘F’ if it is false. Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. (b) Oxalic acid Insulators : distilled water, milk. Check the below NCERT MCQ Questions for Class 8 Science Chapter 13 Sound with Answers Pdf free download. Gradually, a layer of copper builds up on the plate. Question 3. Explain how it can be used for writing. 14.3). Now remove the electrodes from the solution and look at them carefully. When electric current is passed in water hydrogen ions (H+) move towards cathode and get collected over it. Do you find a coating over it? You can refer to NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects of Electric Current to revise the concepts in the syllabus … Answer: Question 10. Activity 7 (NCERT Textbook, Page 177) This solution contains questions, answers, images, explanations of the complete chapter 14 titled Chemical Effects of Electric Current From of Science taught in class 8. Answer: Answer: The process that you saw in Activity 14.7 is used for purification of copper. 14.5. may cause the magnetic needle to deflect. As pure water is free of salts and thus it is an insulator so to make pure water conducting, we can add some salts or acid to it. Maths Students who are looking for better solutions, they can download Class 8 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations. So, the compass needle showed deflection. How should LED be connected ? 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. Name the gases formed when electric current is passed in water containing a few drops of acid ? Question 12. Solution: How are bridges and automobiles prevented from rusting ? (c) chemical energy into electrical energy Thus, lemon juice, vinegar, tap water, milk, curd and water, and soda are good conductors of electricity while vegetable oil, honey, kerosene oil, and distilled water are poor conductors of electricity or insulators. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Visit to Discussion Forum to ask your doubt and reply to your classmates. Answer: Answer: Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in Fig. [NCERT]. Jaya sets up a circuit as given below. Name three liquids, which when tested in the manner shown in Fig. (b) The passage of an electric current through a solution causes _______ effects. (a) Aluminium Answer: Question 6. Compass needle shows deflection due to magnetic effect of electric current. Classify the following liquids into conductors and insulators : lemon juice, , distilled water, tap water, milk. Answer: [NCT 2011] Fill in the blanks. (a) magnetic energy into chemical energy Why ? (c) Sodium chloride Take care that the ends are not more than 1 cm apart but at the same time do not touch each other. (c) electrolysis (c) semi-conductor (d) electroplating. Answer: Answer: What do you find? (iii) The cells may be used up. Question 2. Changes of colour of solutions may occur depending on what solution and electrodes are used. Class 9 Science Chapter 10 Extra Questions and Answers Gravitation. Check the below NCERT MCQ Questions for Class 9 Science Chapter 8 Motion with Answers Pdf free download. What are electrodes ? Browse further to download free CBSE Class 8 Science Worksheets PDF. Answer: Class 8 Science Chapter 14 Chemical Effects of Electric Current Question 10. Why the iron cans are electroplated with tin ? We call these two rods electrodes. (iv) The liquid may be an insulator, i.e., a poor conductor of electricity. If it is still not working then replace the cells with fresh cells. (b) cathode You would conclude that Question 21. Chromium has a good shine, it resists scratches and is corrosion resistant. Cause electrocution, as water is dissociated into its constituent gases, i.e., a layer e.g.., why does hydrogen collect on cathode and oxygen is collected on it instead. 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