Define the following terms. Protection of the surface of bases metals which corrode for e.g., iron is plated with chromium. Dinesh can study the chemical effect of current at home very easily. First and second cap with acid and base respectively, conducts electricity whereas third cap having sugar dissolved in distilled water do not conduct electricity. Question 10. (i) liquid A is a better conductor than liquid B. Instead the iron can be galvanised or painted. Question 10. 14.5. may cause the magnetic needle to deflect. Question 18. Answer: Question 11. Check that all the connections are tight. Browse further to download free CBSE Class 8 Science Worksheets PDF. (c) Dilute sulphuric acid Explain why these deposits occur. Conductors : lemon juice, tap water. [NCERT] Connect the copper plates to the terminals of a battery and immerse them in copper sulphate solution (Fig. Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. Answer: (b), Question 8. Now test if the tester is working or not. Can you think of the possible reasons? Can you explain the reason ? What could be the reasons ? Answer: (b) cathode Paheli had heard that rainwater is as good as distilled water. (a) Generally, non-metals react with acids. Why is chromium used for electroplating ? Explain. Use the tester to test whether distilled water conducts electricity or not. After the electroplating of a spoon with silver, it was found that the anode has become thin. Prepare a list of objects around you that are electroplated. Sound can travel through. Answer: What are conductors ? 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. (c) Sodium Liquid B is a better conductor than liquid A. The electrode, connected to the positive terminal of a battery, is called He finds that the compass needle deflects more in the case of seawater. In metals electric current is conducted by flow of electrons. Here we Provide Class 6 Science Question Answer, Important Questions, MCQ for Various State Boards Students like CBSE, Haryana, uttar pradesh, mp and other state students. [NCERT] Answer: Materials which do not allow electric current to flow through them are called insulators. Wrap an electric wire a few times around the tray. Question 1. 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Question 3. Gravitation Class 9 Extra Questions Very Short Answer Type. But when salt is dissolved in distilled water and again tested, the bulb glows which shows that water containing salts conduct electricity. Answer: What do you find? Question 1. (ii) The bulb may be fused. Question 14. Make sure that the metal caps of the carbon rods are outside the water. You may also get distilled water from a medical store or a doctor or a nurse). Jake three clean plastic or rubber caps of bottles. Insulators : distilled water, milk. Question 13. Why ? Answer: Answer: The longer lead (leg) from the LED should be connected to the positive terminal of the battery and the shorter lead to the negative terminal of the battery. Question 2. (c), Question 7. Give some uses of LED. What colour is the coating? It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. Can you ex¬plain the reason? Dip the ends of the wire in the given liquid. Does distilled water conduct electricity? (b) solids only. This process is known as chemical effects of current. Is it possible that the connections are loose? (d) semi-insulator Gradually, a layer of copper builds up on the plate. The bulb does not glow even though the circuit is complete because the current is too small. If the tester is put in distilled water, the bulb of the tester does not glow. The compass needle will show deflection with tap water, lemon juice and sodium chloride solution. Attach the free ends of the wires to a LED. The writing appears on the paper. We have provided Chemical Effects of Electric Current Class 8 Science MCQs Questions with Answers to help students understand the concept very well. (c) electrolysis So, the compass needle showed deflection. Answer: It is very important for the student to tune-in with this topic in order to understand the topics of the higher class. These questions will test your cognizance, understanding, evaluating and mathematical skills. Hydroxyl ions (OH )move towards the anode and oxygen is collected on it. Answer: Moreover, students will also learn about the dangerous effects of electricity and how it can harm us. Answer: This shows that distilled water does not conduct electricity. Explain why they do this. Question 13. Dissolve two teaspoonfuls of copper sulphate in it. Explain your answer. Why? (c) cathode Add a few drops of lemon juice or dilute hydrochloric acid to distilled water in one cap. Question 1. Mark ‘T’ if the statement is true and ‘F’ if it is false. Now, check the Class 8 Science Chapter 14 question answer PDF on the main website of Vedantu. No, it is highly dangerous to carry out the electrical repairs outdoors during the heavy downpour. You will also love the ad-free experience on Meritnation’s Living Science 2019 Solutions. The Sound Class 8 NCERT solutions provide questions and answers from the NCERT books in a very detailed way. The rainwater showed deflection with the tester because it is not as pure as distilled water. The Class 8 Science Chapter 14 Solutions are now made easy to understand all the concepts and topics related to the chapter precisely. Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in Fig. Does pure water conduct electricity? Question 6. To her surprise she found that the compass needle showed deflection. Answer: Question 12. Answer: (d) Vinegar Do Liquids Conduct Electricity? Answer: Now, check the Class 8 Science Chapter 14 question answer PDF on the main website of Vedantu. Do you find any difference in any one of them? Answer: Explain how it can be used for writing. Class 8 Science Chapter 14 MCQ with Answers 1. Is air an insulator or conductor of electricity ? Collect a few small plastic or rubber caps of discarded bottles and clean them. Therefore, we can be electrocuted in case we touch appliances with wet hands. The temperature around the electroplating equipment should be optimum. Compact Fluorescent Lamps. Take care that the ends are not more than 1 cm apart but at the same time do not touch each other. The iodide ions (I- ) react with starch to turn blue black. Question 3. Take two pieces of copper wire and iron wire. The loss of copper from solution is cqmpensated and the process goes on. Your tester with two free ends of the wire is ready. Question 5. Extra Questions for Class 9 Science Chapter 10 Gravitation with Answers Solutions. Leave your worries of acing the exams and refer to these guides to understand difficult concepts of Chemical Effects of Electric Current with ease. Activity 5 (NCERT Textbook, Page 176) (c) semi-conductor ( ) (b) … Answer: [NCT 2011] Answer: (i) liquid A is a better conductor than liquid B. (iii) The cells may be used up. Leave your worries of acing the exams and refer to these guides to understand difficult concepts of Chemical Effects of Electric Current with ease. NCERT Solutions for Class 8 Science Chapter 8 Cell-Structure and Functions English and Hindi Medium (Adhyay 8: Koshika – Sanrachana evam Prakarya) to Study online or View in Video Format or download free in PDF file free for session 2020-2021. The conduction of electricity is called ………… this completes the circuit is small, can! The main website of Vedantu ‘ F ’ if it is a conductor and the bulb does not in! After electroplating is hazardous and can cause electrocution, as water is an insulator, since it not. Topics in Class 8 Science Chapter 13 includes Solutions of Class 8 Maths Chapter 14 – Mark! Book for Class 8 Science with Answers Solutions can also download CBSE Class 8 Chapter 9 as per book. Then it glows very dimly for liquid B of …………, ……… you pass current through a solution of are! 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