{"id":3941,"date":"2026-03-08T14:39:32","date_gmt":"2026-03-08T14:39:32","guid":{"rendered":"https:\/\/physicscatalyst.com\/testprep\/class-8-science\/electricity-magnetic-and-heating-effects-class-8-mcq\/"},"modified":"2026-03-08T14:39:32","modified_gmt":"2026-03-08T14:39:32","slug":"electricity-magnetic-and-heating-effects-class-8-mcq","status":"publish","type":"post","link":"https:\/\/physicscatalyst.com\/testprep\/class-8-science\/electricity-magnetic-and-heating-effects-class-8-mcq\/","title":{"rendered":"Electricity: Magnetic and Heating Effects Class 8 MCQ"},"content":{"rendered":"<script type=\"text\/javascript\" >\ndocument.addEventListener(\"DOMContentLoaded\", function(event) { \nif(!window.jQuery) alert(\"The important jQuery library is not properly loaded in your site. Your WordPress theme is probably missing the essential wp_head() call. You can switch to another theme and you will see that the plugin works fine and this notice disappears. If you are still not sure what to do you can contact us for help.\");\n});\n<\/script>  \n  \n<div  id=\"watupro_quiz\" class=\"quiz-area single-page-quiz\">\n<p id=\"submittingExam503\" style=\"display:none;text-align:center;\">Please wait...<br><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/physicscatalyst.com\/testprep\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\"><\/p>\n\n<div class=\"watupro-exam-description\" id=\"description-quiz-503\"><p><strong>General Instructions<\/strong><\/p>\n<ul>\n<li>Your test contains multiple-choice questions with only one answer-type question. There are a total of 10 questions<\/li>\n<li>This is a 20 min test. Please make sure you complete it in the stipulated time<\/li>\n<li>You can finish this test any time using the <span style=\"color: #ff0000;\"><strong>'Submit'<\/strong><\/span> button.<\/li>\n<\/ul>\n<\/div>\n\n<form action=\"\" method=\"post\" class=\"quiz-form\" id=\"quiz-503\"  enctype=\"multipart\/form-data\" >\n<div class='watu-question ' id='question-1' style=';'><div id='questionWrap-1'  class='   watupro-question-id-8466'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>1. <\/span>The device which works on the principle of magnetic effects of electric current is<\/div><input type='hidden' name='question_id[]' id='qID_1' value='8466' class='watupro-question-id'\/><input type='hidden' id='answerType8466' class='answerTypeCnt1' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8466'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8466[]' id='answer-id-33812' class='answer   answerof-8466  ' value='33812'   \/><label for='answer-id-33812' id='answer-label-33812' class=' answer'><span>Electric heater<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8466[]' id='answer-id-33813' class='answer   answerof-8466  ' value='33813'   \/><label for='answer-id-33813' id='answer-label-33813' class=' answer'><span>Room heater<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8466[]' id='answer-id-33814' class='answer   answerof-8466  ' value='33814'   \/><label for='answer-id-33814' id='answer-label-33814' class=' answer'><span>Kettle<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8466[]' id='answer-id-33815' class='answer   answerof-8466  ' value='33815'   \/><label for='answer-id-33815' id='answer-label-33815' class=' answer'><span>electric bell<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-2' style=';'><div id='questionWrap-2'  class='   watupro-question-id-8467'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>2. <\/span>who discovered the magnetic effect of electric current?<\/div><input type='hidden' name='question_id[]' id='qID_2' value='8467' class='watupro-question-id'\/><input type='hidden' id='answerType8467' class='answerTypeCnt2' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8467'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8467[]' id='answer-id-33816' class='answer   answerof-8467  ' value='33816'   \/><label for='answer-id-33816' id='answer-label-33816' class=' answer'><span>Hans Christian Oersted<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8467[]' id='answer-id-33817' class='answer   answerof-8467  ' value='33817'   \/><label for='answer-id-33817' id='answer-label-33817' class=' answer'><span>Faraday<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8467[]' id='answer-id-33818' class='answer   answerof-8467  ' value='33818'   \/><label for='answer-id-33818' id='answer-label-33818' class=' answer'><span>Flemings<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8467[]' id='answer-id-33819' class='answer   answerof-8467  ' value='33819'   \/><label for='answer-id-33819' id='answer-label-33819' class=' answer'><span>Newton<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-3' style=';'><div id='questionWrap-3'  class='   watupro-question-id-8468'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>3. <\/span>The strenght of the electromagents increases<\/div><input type='hidden' name='question_id[]' id='qID_3' value='8468' class='watupro-question-id'\/><input type='hidden' id='answerType8468' class='answerTypeCnt3' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8468'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8468[]' id='answer-id-33820' class='answer   answerof-8468  ' value='33820'   \/><label for='answer-id-33820' id='answer-label-33820' class=' answer'><span>Current decrease<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8468[]' id='answer-id-33821' class='answer   answerof-8468  ' value='33821'   \/><label for='answer-id-33821' id='answer-label-33821' class=' answer'><span>No of turns get decreased<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8468[]' id='answer-id-33822' class='answer   answerof-8468  ' value='33822'   \/><label for='answer-id-33822' id='answer-label-33822' class=' answer'><span>Ironcore is removed<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8468[]' id='answer-id-33823' class='answer   answerof-8468  ' value='33823'   \/><label for='answer-id-33823' id='answer-label-33823' class=' answer'><span>when both the current and turns increases<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-4' style=';'><div id='questionWrap-4'  class='   watupro-question-id-8469'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>4. <\/span>When the current is switched off in an electromagnet ?<\/div><input type='hidden' name='question_id[]' id='qID_4' value='8469' class='watupro-question-id'\/><input type='hidden' id='answerType8469' class='answerTypeCnt4' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8469'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8469[]' id='answer-id-33824' class='answer   answerof-8469  ' value='33824'   \/><label for='answer-id-33824' id='answer-label-33824' class=' answer'><span>its increases the strenght<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8469[]' id='answer-id-33825' class='answer   answerof-8469  ' value='33825'   \/><label for='answer-id-33825' id='answer-label-33825' class=' answer'><span>it become a permanant magnet<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8469[]' id='answer-id-33826' class='answer   answerof-8469  ' value='33826'   \/><label for='answer-id-33826' id='answer-label-33826' class=' answer'><span>it loses the magnetism<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8469[]' id='answer-id-33827' class='answer   answerof-8469  ' value='33827'   \/><label for='answer-id-33827' id='answer-label-33827' class=' answer'><span>None of the above<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-5' style=';'><div id='questionWrap-5'  class='   watupro-question-id-8470'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>5. <\/span>When an electric current passes through a conductor, it gets heated. This phenomenon is called as<\/div><input type='hidden' name='question_id[]' id='qID_5' value='8470' class='watupro-question-id'\/><input type='hidden' id='answerType8470' class='answerTypeCnt5' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8470'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8470[]' id='answer-id-33828' class='answer   answerof-8470  ' value='33828'   \/><label for='answer-id-33828' id='answer-label-33828' class=' answer'><span>Magnetic effect of electric current<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8470[]' id='answer-id-33829' class='answer   answerof-8470  ' value='33829'   \/><label for='answer-id-33829' id='answer-label-33829' class=' answer'><span>chemical effect of electric current<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8470[]' id='answer-id-33830' class='answer   answerof-8470  ' value='33830'   \/><label for='answer-id-33830' id='answer-label-33830' class=' answer'><span>Heating effect of electric current<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8470[]' id='answer-id-33831' class='answer   answerof-8470  ' value='33831'   \/><label for='answer-id-33831' id='answer-label-33831' class=' answer'><span>None of the above<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-6' style=';'><div id='questionWrap-6'  class='   watupro-question-id-8471'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>6. <\/span>which of these metal pairs is not used in Voltaic cells<\/div><input type='hidden' name='question_id[]' id='qID_6' value='8471' class='watupro-question-id'\/><input type='hidden' id='answerType8471' class='answerTypeCnt6' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8471'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8471[]' id='answer-id-33832' class='answer   answerof-8471  ' value='33832'   \/><label for='answer-id-33832' id='answer-label-33832' class=' answer'><span>magnesium\/copper<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8471[]' id='answer-id-33833' class='answer   answerof-8471  ' value='33833'   \/><label for='answer-id-33833' id='answer-label-33833' class=' answer'><span>iron\/copper<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8471[]' id='answer-id-33834' class='answer   answerof-8471  ' value='33834'   \/><label for='answer-id-33834' id='answer-label-33834' class=' answer'><span>aluminium\/copper<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8471[]' id='answer-id-33835' class='answer   answerof-8471  ' value='33835'   \/><label for='answer-id-33835' id='answer-label-33835' class=' answer'><span>None of these<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-7' style=';'><div id='questionWrap-7'  class='   watupro-question-id-8472'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>7. <\/span>The polarity of the electromagnet depends on<\/div><input type='hidden' name='question_id[]' id='qID_7' value='8472' class='watupro-question-id'\/><input type='hidden' id='answerType8472' class='answerTypeCnt7' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8472'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8472[]' id='answer-id-33836' class='answer   answerof-8472  ' value='33836'   \/><label for='answer-id-33836' id='answer-label-33836' class=' answer'><span>direction of the current <\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8472[]' id='answer-id-33837' class='answer   answerof-8472  ' value='33837'   \/><label for='answer-id-33837' id='answer-label-33837' class=' answer'><span>thickness of the wire<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8472[]' id='answer-id-33838' class='answer   answerof-8472  ' value='33838'   \/><label for='answer-id-33838' id='answer-label-33838' class=' answer'><span>Number of turns<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8472[]' id='answer-id-33839' class='answer   answerof-8472  ' value='33839'   \/><label for='answer-id-33839' id='answer-label-33839' class=' answer'><span>nature of the wire<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-8' style=';'><div id='questionWrap-8'  class='   watupro-question-id-8473'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>8. <\/span>Assertion (A): Electromagnets do not have poles like the North pole and South pole of a bar magnet.<br \/>\r\nReason (R): When we interchange the terminals of the battery in a circuit, the poles of the electromagnet also change positions.<\/div><input type='hidden' name='question_id[]' id='qID_8' value='8473' class='watupro-question-id'\/><input type='hidden' id='answerType8473' class='answerTypeCnt8' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8473'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8473[]' id='answer-id-33840' class='answer   answerof-8473  ' value='33840'   \/><label for='answer-id-33840' id='answer-label-33840' class=' answer'><span>Both (A) and (R) are true, and (R) is the correct explanation of (A).<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8473[]' id='answer-id-33841' class='answer   answerof-8473  ' value='33841'   \/><label for='answer-id-33841' id='answer-label-33841' class=' answer'><span>Both (A) and (R) are true, but (R) is not the correct explanation of (A).<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8473[]' id='answer-id-33842' class='answer   answerof-8473  ' value='33842'   \/><label for='answer-id-33842' id='answer-label-33842' class=' answer'><span>(A) is true, but (R) is false.<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8473[]' id='answer-id-33843' class='answer   answerof-8473  ' value='33843'   \/><label for='answer-id-33843' id='answer-label-33843' class=' answer'><span>(A) is false, but (R) is true.<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-9' style=';'><div id='questionWrap-9'  class='   watupro-question-id-8474'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>9. <\/span>Carbon rod acts as ______ in dry cell<\/div><input type='hidden' name='question_id[]' id='qID_9' value='8474' class='watupro-question-id'\/><input type='hidden' id='answerType8474' class='answerTypeCnt9' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8474'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8474[]' id='answer-id-33844' class='answer   answerof-8474  ' value='33844'   \/><label for='answer-id-33844' id='answer-label-33844' class=' answer'><span>positive terminal<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8474[]' id='answer-id-33845' class='answer   answerof-8474  ' value='33845'   \/><label for='answer-id-33845' id='answer-label-33845' class=' answer'><span>Negative terminal<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8474[]' id='answer-id-33846' class='answer   answerof-8474  ' value='33846'   \/><label for='answer-id-33846' id='answer-label-33846' class=' answer'><span>Neutral terminal<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8474[]' id='answer-id-33847' class='answer   answerof-8474  ' value='33847'   \/><label for='answer-id-33847' id='answer-label-33847' class=' answer'><span>None of the above<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div class='watu-question ' id='question-10' style=';'><div id='questionWrap-10'  class='   watupro-question-id-8475'>\n\t\t\t<div class='question-content'><div><span class='watupro_num'>10. <\/span>which electrode acts as postive terminal in Lemon cell?<\/div><input type='hidden' name='question_id[]' id='qID_10' value='8475' class='watupro-question-id'\/><input type='hidden' id='answerType8475' class='answerTypeCnt10' value='radio'><!-- end question-content--><\/div><div class='question-choices watupro-choices-columns '  id='questionChoices8475'><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8475[]' id='answer-id-33848' class='answer   answerof-8475  ' value='33848'   \/><label for='answer-id-33848' id='answer-label-33848' class=' answer'><span>copper<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8475[]' id='answer-id-33849' class='answer   answerof-8475  ' value='33849'   \/><label for='answer-id-33849' id='answer-label-33849' class=' answer'><span>zinc<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8475[]' id='answer-id-33850' class='answer   answerof-8475  ' value='33850'   \/><label for='answer-id-33850' id='answer-label-33850' class=' answer'><span>iron<\/span><\/label><\/div><div class='watupro-question-choice  ' dir='auto' ><input type='radio' name='answer-8475[]' id='answer-id-33851' class='answer   answerof-8475  ' value='33851'   \/><label for='answer-id-33851' id='answer-label-33851' class=' answer'><span>aluminium<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div><\/div><div style='display:none' id='question-11'>\n\t<div class='question-content'>\n\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/physicscatalyst.com\/testprep\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\" alt=\"Loading...\" title=\"Loading...\" \/>&nbsp;Loading...\t<\/div>\n<\/div>\n\n<br 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