{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"X\u00e9t c\u00e1c d\u1ee5ng c\u1ee5 \u0111i\u1ec7n sau: Qu\u1ea1t \u0111i\u1ec7n; n\u1ed3i c\u01a1m \u0111i\u1ec7n; m\u00e1y thu h\u00ecnh (tivi); m\u00e1y thu thanh (radio); \u1ea5m \u0111i\u1ec7n.<br\/>H\u1ecfi khi c\u00e1c d\u1ee5ng c\u1ee5 n\u00e0y ho\u1ea1t \u0111\u1ed9ng th\u00ec t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n l\u00e0 c\u00f3 \u00edch \u0111\u1ed1i v\u1edbi d\u1ee5ng c\u1ee5 n\u00e0o?","select":["A. Qu\u1ea1t \u0111i\u1ec7n; n\u1ed3i c\u01a1m \u0111i\u1ec7n;","B. Qu\u1ea1t \u0111i\u1ec7n; m\u00e1y thu h\u00ecnh (tivi);","C. N\u1ed3i c\u01a1m \u0111i\u1ec7n; \u1ea5m \u0111i\u1ec7n;","D. T\u1ea5t c\u1ea3"],"hint":"","explain":"<span class='basic_left'>N\u1ed3i c\u01a1m \u0111i\u1ec7n; \u1ea5m \u0111i\u1ec7n c\u00f3 \u1ee9ng d\u1ee5ng bi\u1ebfn d\u1ed5i \u0111i\u1ec7n n\u0103ng th\u00e0nh nhi\u1ec7t n\u0103ng n\u00ean t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n l\u00e0 c\u00f3 \u00edch.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2451},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Ng\u01b0\u1eddi ta s\u1eed d\u1ee5ng \u1ea5m \u0111i\u1ec7n \u0111\u1ec3 \u0111un n\u01b0\u1edbc, h\u00e3y cho bi\u1ebft:<br\/> N\u1ebfu c\u00f2n n\u01b0\u1edbc trong \u1ea5m th\u00ec nhi\u1ec7t \u0111\u1ed9 c\u1ee7a \u1ea5m cao nh\u1ea5t l\u00e0 bao nhi\u00eau?","select":["A. ${100}^\\circ C$","B. ${80}^\\circ C$","C. ${60}^\\circ C$","D. ${50}^\\circ C$"],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t \u0111\u1ed9 c\u1ee7a \u1ea5m cao nh\u1ea5t l\u00e0 ${100}^\\circ C$, b\u1eb1ng nhi\u1ec7t \u0111\u1ed9 s\u00f4i c\u1ee7a n\u01b0\u1edbc.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2452},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"N\u1ebfu v\u00f4 \u00fd \u0111\u1ec3 qu\u00ean, n\u01b0\u1edbc trong \u1ea5m c\u1ea1n h\u1ebft th\u00ec c\u00f3 s\u1ef1 c\u1ed1 g\u00ec x\u1ea3y ra?","select":["A. Khi c\u1ea1n h\u1ebft n\u01b0\u1edbc, do t\u00e1c d\u1ee5ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n, nhi\u1ec7t \u0111\u1ed9 c\u1ee7a \u1ea5m t\u0103ng l\u00ean r\u1ea5t cao. D\u00e2y nung n\u00f3ng ( ru\u1ed9t \u1ea5m) s\u1ebd n\u00f3ng ch\u1ea3y, kh\u00f4ng d\u00f9ng \u0111\u01b0\u1ee3c n\u1eefa. Do v\u1eady \u1ea5m \u0111i\u1ec7n b\u1ecb ch\u00e1y, h\u1ecfng. M\u1ed9t s\u1ed1 v\u1eadt \u0111\u1ec3 g\u1ea7n \u1ea5m c\u00f3 th\u1ec3 b\u1eaft ch\u00e1y, g\u00e2y h\u1ecfa ho\u1ea1n.","B. Khi c\u1ea1n h\u1ebft n\u01b0\u1edbc \u1ea5m b\u1eaft \u0111\u1ea7u ngu\u1ed9i \u0111i","C. Khi c\u1ea1n h\u1ebft n\u01b0\u1edbc, n\u01b0\u1edbc ng\u01b0ng t\u1ee5 l\u1ea1i","D. C\u1ea3 3 \u0111\u00e1p \u00e1n tr\u00ean sai"],"hint":"","explain":"<span class='basic_left'>Khi c\u1ea1n h\u1ebft n\u01b0\u1edbc, do t\u00e1c d\u1ee5ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n, nhi\u1ec7t \u0111\u1ed9 c\u1ee7a \u1ea5m t\u0103ng l\u00ean r\u1ea5t cao. D\u00e2y nung n\u00f3ng ( ru\u1ed9t \u1ea5m) s\u1ebd n\u00f3ng ch\u1ea3y, kh\u00f4ng d\u00f9ng \u0111\u01b0\u1ee3c n\u1eefa. Do v\u1eady \u1ea5m \u0111i\u1ec7n b\u1ecb ch\u00e1y, h\u1ecfng. M\u1ed9t s\u1ed1 v\u1eadt \u0111\u1ec3 g\u1ea7n \u1ea5m c\u00f3 th\u1ec3 b\u1eaft ch\u00e1y, g\u00e2y h\u1ecfa ho\u1ea1n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2453},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"D\u00f2ng \u0111i\u1ec7n c\u00f3 t\u00e1c d\u1ee5ng ph\u00e1t s\u00e1ng khi ch\u1ea1y qua b\u1ed9 ph\u1eadn hay d\u1ee5ng c\u1ee5 \u0111i\u1ec7n n\u00e0o d\u01b0\u1edbi \u0111\u00e2y khi ch\u00fang \u0111ang ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng?","select":["A. Ru\u1ed9t \u1ea5m \u0111i\u1ec7n.","B. C\u00f4ng t\u1eafc.","C. D\u00e2y d\u1eabn \u0111i\u1ec7n c\u1ee7a m\u1ea1ch \u0111i\u1ec7n trong gia \u0111\u00ecnh .","D. \u0110\u00e8n b\u00e1o tivi."],"hint":"","explain":"<span class='basic_left'>D\u00f2ng \u0111i\u1ec7n c\u00f3 t\u00e1c d\u1ee5ng ph\u00e1t s\u00e1ng khi ch\u1ea1y qua \u0111\u00e8n b\u00e1o tivi khi ch\u00fang \u0111ang ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2454},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<span class='basic_left'>Ph\u00e1t bi\u1ec3u n\u00e0o \u0111\u00fang: <br\/>a. C\u00f3 nh\u1eefng v\u1eadt d\u1eabn th\u00f4ng th\u01b0\u1eddng m\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111i qua ch\u00fang ho\u00e0n to\u00e0n kh\u00f4ng g\u00e2y ra t\u00e1c d\u1ee5ng nhi\u1ec7t.<br\/>b. \u0110\u00e8n d\u00e2y t\u00f3c n\u00f3ng s\u00e1ng ch\u1ee9ng t\u1ecf t\u00e1c d\u1ee5ng ph\u00e1t s\u00e1ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n.<br\/>c. \u0110\u00e8n \u0111i\u00f4t ph\u00e1t quang (\u0111\u00e8n LED) ch\u1ec9 cho d\u00f2ng \u0111i\u1ec7n \u0111i qua theo m\u1ed9t chi\u1ec1u nh\u1ea5t \u0111\u1ecbnh.<br\/>d. Vonfram \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m d\u00e2y t\u00f3c c\u1ee7a b\u00f3ng \u0111\u00e8n v\u00ec n\u00f3 l\u00e0 kim lo\u1ea1i c\u00f3 nhi\u1ec7t \u0111\u1ed9 n\u00f3ng ch\u1ea3y cao.<br\/>e. B\u00f3ng \u0111\u00e8n c\u1ee7a b\u00fat th\u1eed \u0111i\u1ec7n ph\u00e1t s\u00e1ng khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua ch\u1ea5t kh\u00ed \u1edf kho\u1ea3ng gi\u1eefa hai \u0111\u1ea7u d\u00e2y b\u00ean trong \u0111\u00e8n.<br\/>g. M\u1ecdi \u0111\u00e8n \u0111i\u1ec7n ph\u00e1t s\u00e1ng \u0111\u1ec1u do d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua l\u00e0m ch\u00fang n\u00f3ng ch\u1ea3y t\u1edbi nhi\u1ec7t \u0111\u1ed9 cao.<br\/>h. C\u1ea7u ch\u00ec t\u1ef1 \u0111\u1ed9ng ng\u1eaft m\u1ea1ch nh\u1edd t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n.<\/span>","select":["A. C\u00e2u \u0111\u00fang l\u00e0: c, d, e, h","B. C\u00e2u \u0111\u00fang l\u00e0: c, d, e, g","C. C\u00e2u \u0111\u00fang l\u00e0: a, c, e, g","D. T\u1ea5t c\u1ea3 \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":"<span class='basic_left'>C\u00e2u \u0111\u00fang l\u00e0: c, d, e, g.<br\/>c. \u0110\u00e8n \u0111i\u00f4t ph\u00e1t quang (\u0111\u00e8n LED) ch\u1ec9 cho d\u00f2ng \u0111i\u1ec7n \u0111i qua theo m\u1ed9t chi\u1ec1u nh\u1ea5t \u0111\u1ecbnh.<br\/>d. Vonfram \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m d\u00e2y t\u00f3c c\u1ee7a b\u00f3ng \u0111\u00e8n v\u00ec n\u00f3 l\u00e0 kim lo\u1ea1i c\u00f3 nhi\u1ec7t \u0111\u1ed9 n\u00f3ng ch\u1ea3y cao.<br\/>e. B\u00f3ng \u0111\u00e8n c\u1ee7a b\u00fat th\u1eed \u0111i\u1ec7n ph\u00e1t s\u00e1ng khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua ch\u1ea5t kh\u00ed \u1edf kho\u1ea3ng gi\u1eefa hai \u0111\u1ea7u d\u00e2y b\u00ean trong \u0111\u00e8n.<br\/>g. M\u1ecdi \u0111\u00e8n \u0111i\u1ec7n ph\u00e1t s\u00e1ng \u0111\u1ec1u do d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua l\u00e0m ch\u00fang n\u00f3ng ch\u1ea3y t\u1edbi nhi\u1ec7t \u0111\u1ed9 cao.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2455},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Ho\u1ea1t \u0111\u1ed9ng c\u1ee7a d\u1ee5ng c\u1ee5 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y d\u1ef1a tr\u00ean t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n?","select":["A. \u0110i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng.","B. Ra\u0111i\u00f4 (m\u00e1y thu thanh).","C. Tivi (m\u00e1y thu h\u00ecnh).","D. N\u1ed3i c\u01a1m \u0111i\u1ec7n."],"hint":"","explain":"<span class='basic_left'>Ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u1ed3i c\u01a1m \u0111i\u1ec7n d\u1ef1a tr\u00ean t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2456},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Ho\u1ea1t \u0111\u1ed9ng c\u1ee7a d\u1ee5ng c\u1ee5 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y kh\u00f4ng d\u1ef1a tr\u00ean t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n?","select":["A. B\u00e0n l\u00e0 \u0111i\u1ec7n","B. M\u00e1y s\u1ea5y t\u00f3c","C. \u0110\u00e8n LED","D. \u1ea4m \u0111i\u1ec7n \u0111ang \u0111un n\u01b0\u1edbc"],"hint":"","explain":"<span class='basic_left'>Ho\u1ea1t \u0111\u1ed9ng \u0111\u00e8n LED kh\u00f4ng d\u1ef1a tr\u00ean t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2457},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"D\u1ee5ng c\u1ee5 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y ch\u1ee9ng t\u1ecf d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 c\u00f3 th\u1ec3 l\u00e0m v\u1eadt d\u1eabn n\u00f3ng l\u00ean t\u1edbi nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 ph\u00e1t s\u00e1ng?","select":["A. B\u00f3ng \u0111\u00e8n c\u1ee7a b\u00fat th\u1eed \u0111i\u1ec7n.","B. B\u00f3ng \u0111\u00e8n d\u00e2y t\u00f3c.","C. \u0110\u00e8n LED.","D. \u1ea4m \u0111i\u1ec7n \u0111ang \u0111un n\u01b0\u1edbc."],"hint":"","explain":"<span class='basic_left'>B\u00f3ng \u0111\u00e8n d\u00e2y t\u00f3c ch\u1ee9ng t\u1ecf d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00f3 c\u00f3 th\u1ec3 l\u00e0m v\u1eadt d\u1eabn n\u00f3ng l\u00ean t\u1edbi nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 ph\u00e1t s\u00e1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2458},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Trong c\u00e1c c\u1ee5m v\u1eadt d\u1ee5ng li\u1ec7t k\u00ea d\u01b0\u1edbi \u0111\u00e2y, c\u1ee5m n\u00e0o ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n?","select":["A. N\u1ed3i c\u01a1m \u0111i\u1ec7n, qu\u1ea1t \u0111i\u1ec7n, radio, tivi.","B. M\u00e1y b\u01a1m n\u01b0\u1edbc, b\u00e0n l\u00e0, b\u00fat th\u1eed \u0111i\u1ec7n, \u0111\u1ed3ng h\u1ed3 \u0111i\u1ec7n.","C. \u1ea4m \u0111i\u1ec7n, m\u00e1y t\u00ednh b\u1ecf t\u00fai, m\u00e1y ch\u1ee5p \u1ea3nh t\u1ef1 \u0111\u1ed9ng, chu\u00f4ng \u0111i\u1ec7n.","D. B\u1ebfp \u0111i\u1ec7n, b\u00f3ng \u0111\u00e8n d\u00e2y t\u00f3c, n\u1ed3i c\u01a1m \u0111i\u1ec7n, b\u00e0n l\u00e0, l\u00f2 s\u01b0\u1edfi \u0111i\u1ec7n."],"hint":"","explain":"<span class='basic_left'>B\u1ebfp \u0111i\u1ec7n, b\u00f3ng \u0111\u00e8n d\u00e2y t\u00f3c, n\u1ed3i c\u01a1m \u0111i\u1ec7n, b\u00e0n l\u00e0, l\u00f2 s\u01b0\u1edfi \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2459},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"D\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u1ee5ng c\u1ee5 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y khi ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng v\u1eeba c\u00f3 t\u00e1c d\u1ee5ng nhi\u1ec7t, v\u1eeba c\u00f3 t\u00e1c d\u1ee5ng ph\u00e1t s\u00e1ng?","select":["A. Thanh nung c\u1ee7a n\u1ed3i c\u01a1m \u0111i\u1ec7n","B. Radio (m\u00e1y thu thanh)","C. Ru\u1ed9t \u1ea5m \u0111i\u1ec7n","D. \u0110\u00e8n s\u1ee3i \u0111\u1ed1t"],"hint":"","explain":"<span class='basic_left'>D\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u00e8n s\u1ee3i \u0111\u1ed1t khi ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng v\u1eeba c\u00f3 t\u00e1c d\u1ee5ng nhi\u1ec7t, v\u1eeba c\u00f3 t\u00e1c d\u1ee5ng ph\u00e1t s\u00e1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2460},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Ho\u1ea1t \u0111\u1ed9ng c\u1ee7a d\u1ee5ng c\u1ee5 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y ch\u1ee9ng t\u1ecf d\u00f2ng \u0111i\u1ec7n \u0111i qua \u0111\u01b0\u1ee3c ch\u1ea5t kh\u00ed?","select":["A. B\u00f3ng \u0111\u00e8n d\u00e2y t\u00f3c","B. B\u00e0n l\u00e0","C. C\u1ea7u ch\u00ec","D. B\u00f3ng \u0111\u00e8n c\u1ee7a b\u00fat th\u1eed \u0111i\u1ec7n"],"hint":"","explain":"<span class='basic_left'>Trong b\u00f3ng \u0111\u00e8n b\u00fat th\u1eed \u0111i\u1ec7n c\u00f3 2 c\u1ef1a t\u00e1ch r\u1eddi nhau, b\u00ean trong b\u00f3ng l\u00e0 kh\u00ed neon, khi c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1eb7t v\u00e0o 2 c\u1ef1c, d\u00f2ng \u0111i\u1ec7n ph\u00f3ng qua ch\u1ea5t kh\u00ed gi\u1eefa 2 b\u1ea3n c\u1ef1c l\u00e0m \u0111\u00e8n s\u00e1ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2461},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/vatly/bai22/lv2/img\/h0.jpg'\/><\/center>H\u00e3y gh\u00e9p c\u00e1c d\u1ee5ng c\u1ee5 cho \u1edf c\u1ed9t b\u00ean ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi m\u1ed7i t\u00e1c d\u1ee5ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c n\u00eau \u1edf c\u1ed9t b\u00ean tr\u00e1i.","select":["A. 1 - b ; 2 - e ; 3 - c ; 4 - a","B. 1 - e ; 2 - b ; 3 - c ; 4 - a","C. 1 - b ; 2 - c ; 3 - d ; 4 - a","D. 1 - b ; 2 - e ; 3 - a ; 4 - c"],"hint":"","explain":"<span class='basic_left'>V\u1edbi:<br\/> B\u00f3ng \u0111\u00e8n d\u00e2y t\u00f3c d\u00f2ng \u0111i\u1ec7n c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m v\u1eadt d\u1eabn n\u00f3ng l\u00ean \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 ph\u00e1t s\u00e1ng.<br\/>C\u1ea7u ch\u00ec d\u00f2ng \u0111i\u1ec7n c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m n\u00f3ng ch\u1ea3y \u0111o\u1ea1n d\u00e2y d\u1eabn v\u00e0 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n ph\u00e1t s\u00e1ng.<br\/>LED d\u00f2ng \u0111i\u1ec7n c\u00f3 t\u00e1c d\u1ee5ng khi \u0111i qua theo m\u1ed9t chi\u1ec1u nh\u1ea5t \u0111\u1ecbnh th\u00ec \u0111\u00e8n ph\u00e1t s\u00e1ng.<br\/>\u1ea4m \u0111i\u1ec7n, n\u1ed3i c\u01a1m \u0111i\u1ec7n, b\u00e0n l\u00e0 d\u00f2ng \u0111i\u1ec7n c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m n\u00f3ng d\u00e2y d\u1eabn \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u00e1c ngu\u1ed3n to\u1ea3 nhi\u1ec7t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2462},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Thi\u1ebft b\u1ecb \u0111i\u1ec7n n\u00e0o sau \u0111\u00e2y bi\u1ebfn n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n th\u00e0nh chuy\u1ec3n \u0111\u1ed9ng ?","select":["A. N\u1ed3i c\u01a1m \u0111i\u1ec7n","B. B\u00f3ng \u0111\u00e8n s\u1ee3i \u0111\u1ed1t","C. M\u00e1y b\u01a1m n\u01b0\u1edbc","D. \u1ea4m \u0111un n\u01b0\u1edbc"],"hint":"","explain":"<span class='basic_left'>M\u00e1y b\u01a1m n\u01b0\u1edbc bi\u1ebfn n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n th\u00e0nh chuy\u1ec3n \u0111\u1ed9ng ( c\u01a1 n\u0103ng ).<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2463},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"C\u1ea7u ch\u00ec ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean t\u00e1c d\u1ee5ng n\u00e0o c\u1ee7a d\u00f2ng \u0111i\u1ec7n?","select":["A. T\u00e1c d\u1ee5ng nhi\u1ec7t","B. T\u00e1c d\u1ee5ng ph\u00e1t s\u00e1ng","C. T\u00e1c d\u1ee5ng nhi\u1ec7t v\u00e0 ph\u00e1t s\u00e1ng","D. M\u1ed9t t\u00e1c d\u1ee5ng kh\u00e1c"],"hint":"","explain":"<span class='basic_left'>Khi trong m\u1ea1ch \u0111i\u1ec7n c\u00f3 d\u00f2ng \u0111i\u1ec7n cao, l\u00e0m d\u00e2y ch\u00ec trong c\u1ea7u ch\u00ec n\u00f3ng l\u00ean, ch\u1ea3y ra (v\u00ec d\u00e2y ch\u00ec c\u00f3 nhi\u1ec7t \u0111\u1ed9 n\u00f3ng ch\u1ea3y th\u1ea5p), ng\u1eaft m\u1ea1ch.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2464},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Ch\u1ecdn ph\u00e1t bi\u1ec3u sai trong c\u00e1c c\u00e2u sau:","select":["A. B\u00f3ng \u0111\u00e8n c\u1ee7a b\u00fat th\u1eed \u0111i\u1ec7n ph\u00e1t s\u00e1ng khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua ch\u1ea5t kh\u00ed \u1edf trong kho\u1ea3ng gi\u1eefa hai \u0111\u1ea7u d\u00e2y b\u00ean trong \u0111\u00e8n","B. M\u1ecdi \u0111\u00e8n \u0111i\u1ec7n ph\u00e1t s\u00e1ng \u0111\u1ec1u do d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua l\u00e0m ch\u00fang n\u00f3ng t\u1edbi nhi\u1ec7t \u0111\u1ed9 cao","C. Vonfram \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m d\u00e2y t\u00f3c c\u1ee7a b\u00f3ng \u0111\u00e8n v\u00ec n\u00f3 l\u00e0 kim lo\u1ea1i c\u00f3 nhi\u1ec7t \u0111\u1ed9 n\u00f3ng ch\u1ea3y cao","D. \u0110\u00e8n \u0111i\u00f4t ph\u00e1t quang (\u0111\u00e8n LED) ch\u1ec9 cho d\u00f2ng \u0111i\u1ec7n \u0111i qua theo m\u1ed9t chi\u1ec1u nh\u1ea5t \u0111\u1ecbnh"],"hint":"","explain":"<span class='basic_left'>\u0110\u00e8n LED v\u00e0 \u0111\u00e8n hu\u1ef3nh quang, \u0111\u00e8n trong b\u00f3ng th\u1eed \u0111i\u1ec7n, ... kh\u00f4ng tu\u00e2n theo quy t\u1eafc n\u00e0y.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2465},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"M\u1eb7t tr\u1eddi v\u1eeba t\u1ecfa nhi\u1ec7t, v\u1eeba ph\u00e1t s\u00e1ng, v\u1eady m\u1eb7t tr\u1eddi c\u00f3 \u0111i\u1ec7n \u0111\u00fang kh\u00f4ng? V\u00ec sao?","select":["A. \u0110\u00fang, v\u00ec c\u00f3 \u0111i\u1ec7n th\u00ec m\u1edbi ph\u00e1t s\u00e1ng l\u00e2u v\u1eady \u0111\u01b0\u1ee3c","B. Sai, v\u00ec kh\u00f4ng c\u00f3 d\u00e2y \u0111i\u1ec7n n\u1ed1i t\u1edbi m\u1eb7t tr\u1eddi","C. Sai, v\u00ec n\u0103ng l\u01b0\u1ee3ng c\u1ee7a m\u1eb7t tr\u1eddi l\u00e0 s\u1ef1 t\u1ed5ng h\u1ee3p c\u00e1c ph\u1ea3n \u1ee9ng nhi\u1ec7t h\u1ea1ch v\u00e0 ph\u00e2n h\u1ea1ch","D. C\u1ea3 3 \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":"<span class='basic_left'>N\u0103ng l\u01b0\u1ee3ng c\u1ee7a m\u1eb7t tr\u1eddi l\u00e0 s\u1ef1 t\u1ed5ng h\u1ee3p c\u00e1c ph\u1ea3n \u1ee9ng nhi\u1ec7t h\u1ea1ch v\u00e0 ph\u00e2n h\u1ea1ch, l\u00e0 c\u00e1c ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc sinh ra nhi\u1ec7t. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2466},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"D\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u00e8n n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0m ph\u00e1t s\u00e1ng ch\u1ea5t kh\u00ed?","select":["A. \u0110\u00e8n LED (diot ph\u00e1t quang)","B. \u0110\u00e8n d\u00e2y t\u00f3c \u0111ui c\u00e0i","C. \u0110\u00e8n d\u00e2y t\u00f3c \u0111ui xo\u00e1y","D. \u0110\u00e8n c\u1ee7a b\u00fat th\u1eed \u0111i\u1ec7n"],"hint":"","explain":"<span class='basic_left'>Trong b\u00f3ng \u0111\u00e8n b\u00fat th\u1eed \u0111i\u1ec7n c\u00f3 2 c\u1ef1c t\u00e1ch r\u1eddi nhau, b\u00ean trong b\u00f3ng l\u00e0 kh\u00ed neon, khi c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1eb7t v\u00e0o 2 c\u1ef1c, d\u00f2ng \u0111i\u1ec7n ph\u00f3ng qua ch\u1ea5t kh\u00ed gi\u1eefa 2 b\u1ea3n c\u1ef1c l\u00e0m \u0111\u00e8n s\u00e1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2467},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Nh\u1eadn x\u00e9t g\u00ec khi d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u1eadt d\u1eabn?","select":["A. V\u1eadt d\u1eabn \u0111i\u1ec7n n\u00f3ng l\u00ean khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua","B. V\u1eadt d\u1eabn \u0111i\u1ec7n l\u1ea1nh \u0111i khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua","C. V\u1eadt d\u1eabn \u0111i\u1ec7n cho d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua n\u00ean kh\u00f4ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng g\u00ec","D. C\u1ea3 3 \u0111\u1ec1u sai"],"hint":"","explain":"<span class='basic_left'>V\u1eadt d\u1eabn \u0111i\u1ec7n n\u00f3ng l\u00ean khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u00f3 l\u00e0 t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a d\u00f2ng \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2468},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"T\u1ea1i sao c\u1ea7u ch\u00ec l\u1ea1i c\u00f3 l\u00f5i l\u00e0m b\u1eb1ng ch\u00ec m\u00e0 kh\u00f4ng ph\u1ea3i kim lo\u1ea1i kh\u00e1c?","select":["A. V\u00ec ch\u00ec r\u1ebb h\u01a1n ","B. V\u00ec \u0111\u1ed3ng d\u1ec5 n\u00f3ng ch\u1ea3y h\u01a1n","C. V\u00ec ch\u00ec c\u00f3 nhi\u1ec7t \u0111\u1ed9 n\u00f3ng ch\u1ea3y th\u1ea5p h\u01a1n n\u00ean khi g\u1eb7p s\u1ef1 c\u1ed1 v\u1ec1 \u0111i\u1ec7n th\u00ec n\u00f3 s\u1ebd ch\u1ea3y ra l\u00e0m ng\u1eaft d\u00f2ng \u0111i\u1ec7n","D. C\u1ea3 3 \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":"<span class='basic_left'>C\u1ea7u ch\u00ec l\u1ea1i c\u00f3 l\u00f5i l\u00e0m b\u1eb1ng ch\u00ec v\u00ec ch\u00ec c\u00f3 nhi\u1ec7t \u0111\u1ed9 n\u00f3ng ch\u1ea3y th\u1ea5p h\u01a1n n\u00ean khi g\u1eb7p s\u1ef1 c\u1ed1 v\u1ec1 \u0111i\u1ec7n th\u00ec n\u00f3 s\u1ebd ch\u1ea3y ra l\u00e0m ng\u1eaft d\u00f2ng \u0111i\u1ec7n. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2469},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/>V\u1eadt d\u1eabn \u0111i\u1ec7n\u2026\u2026\u2026\u2026khi\u2026\u2026\u2026\u2026\u2026ch\u1ea1y qua","select":["A. N\u00f3ng l\u00ean - c\u00f3 d\u00f2ng \u0111i\u1ec7n","B. N\u00f3ng l\u00ean - kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n","C. Kh\u00f4ng n\u00f3ng l\u00ean - c\u00f3 d\u00f2ng \u0111i\u1ec7n","D. C\u1ea3 ba c\u00e2u \u0111\u1ec1u sai"],"hint":"","explain":"<span class='basic_left'>V\u1eadt d\u1eabn \u0111i\u1ec7n n\u00f3ng l\u00ean khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2470}],"lesson":{"save":0,"level":2}}