{"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":"Tai ta nghe \u0111\u01b0\u1ee3c ti\u1ebfng vang khi n\u00e0o?","select":["A. Khi \u00e2m ph\u00e1t ra \u0111\u1ebfn tai sau \u00e2m ph\u1ea3n x\u1ea1","B. Khi \u00e2m ph\u00e1t ra \u0111\u1ebfn g\u1ea7n nh\u01b0 c\u00f9ng m\u1ed9t l\u00fac v\u1edbi \u00e2m ph\u1ea3n x\u1ea1","C. Khi \u00e2m ph\u00e1t ra \u0111\u1ebfn tai tr\u01b0\u1edbc \u00e2m ph\u1ea3n x\u1ea1","D. C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p tr\u00ean \u0111\u1ec1u nghe th\u1ea5y ti\u1ebfng vang"],"hint":"","explain":"<span class='basic_left'>Tai ta nghe \u0111\u01b0\u1ee3c ti\u1ebfng vang khi \u00e2m ph\u00e1t ra \u0111\u1ebfn tai tr\u01b0\u1edbc \u00e2m ph\u1ea3n x\u1ea1.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2291},{"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":"V\u1eadt n\u00e0o d\u01b0\u1edbi \u0111\u00e2y ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t?","select":["A. Mi\u1ebfng x\u1ed1p","B. T\u1ea5m g\u1ed7","C. M\u1eb7t g\u01b0\u01a1ng","D. \u0110\u1ec7m cao su"],"hint":"","explain":"<span class='basic_left'>M\u1eb7t g\u01b0\u01a1ng ph\u1eb3ng, nh\u1eb5n v\u00e0 r\u1eafn n\u00ean ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2292},{"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":"K\u1ebft lu\u1eadn n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang?","select":["A. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t l\u00e0 nh\u1eefng v\u1eadt c\u00f3 b\u1ec1 m\u1eb7t s\u1ea7n s\u00f9i, g\u1ed3 gh\u1ec1","B. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m l\u00e0 nh\u1eefng v\u1eadt c\u00f3 b\u1ec1 m\u1eb7t nh\u1eb5n, c\u1ee9ng","C. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t l\u00e0 nh\u1eefng v\u1eadt c\u00f3 k\u00edch th\u01b0\u1edbc l\u1edbn","D. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m l\u00e0 nh\u1eefng v\u1eadt m\u1ec1m, kh\u00f4ng nh\u1eb5n"],"hint":"","explain":"<span class='basic_left'>V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m l\u00e0 nh\u1eefng v\u1eadt m\u1ec1m, kh\u00f4ng nh\u1eb5n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2293},{"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":"Em ph\u1ea3i \u0111\u1ee9ng c\u00e1ch xa n\u00fai \u00edt nh\u1ea5t l\u00e0 bao nhi\u00eau, \u0111\u1ec3 t\u1ea1i \u0111\u00f3, em \u0111\u01b0\u1ee3c ti\u1ebfng vang t\u1eeb ti\u1ebfng n\u00f3i c\u1ee7a m\u00ecnh? Bi\u1ebft r\u1eb1ng v\u1eadn t\u1ed1c truy\u1ec1n c\u1ee7a \u00e2m trong kh\u00f4ng kh\u00ed l\u00e0 340m\/s.","select":["A. 22,7m","B. 11,35m","C. 34,05m","D. 5,675m"],"hint":"","explain":"<span class='basic_left'>\u0110\u1ec3 c\u00f3 ti\u1ebfng vang trong kh\u00f4ng kh\u00ed, th\u00ec th\u1eddi gian k\u1ec3 t\u1eeb khi \u00e2m ph\u00e1t \u0111\u1ebfn khi nh\u1eadn \u0111\u01b0\u1ee3c \u00e2m ph\u1ea3n x\u1ea1 t\u1ed1i thi\u1ec3u ph\u1ea3i b\u1eb1ng $\\dfrac{1}{15}s$ . Trong kho\u1ea3ng th\u1eddi gian $\\dfrac{1}{15}s$, \u00e2m \u0111i \u0111\u01b0\u1ee3c m\u1ed9t qu\u00e3ng \u0111\u01b0\u1eddng l\u00e0: <br\/>$\\dfrac{1}{15}s$ x 340 m\/s = 22,7m.<br\/>V\u1eady, \u0111\u1ec3 nghe \u0111\u01b0\u1ee3c ti\u1ebfng vang ti\u1ebfng n\u00f3i c\u1ee7a m\u00ecnh, ph\u1ea3i \u0111\u1ee9ng c\u00e1ch xa n\u00fai \u00edt nh\u1ea5t:<br\/> 22,7m : 2 = 11,35m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2294},{"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":"\u0110\u1ec3 tr\u00e1nh \u0111\u01b0\u1ee3c hi\u1ec7n t\u01b0\u1ee3ng c\u00f3 ti\u1ebfng vang trong ph\u00f2ng, th\u00ec ph\u1ea3i ph\u1ea3i c\u00f3 k\u00edch th\u01b0\u1edbc n\u00e0o sau \u0111\u00e2y?","select":["A. Nh\u1ecf h\u01a1n 11,5m","B. L\u1edbn h\u01a1n 11,5m","C. Nh\u1ecf h\u01a1n 11,35m","D. L\u1edbn h\u01a1n 11,35m"],"hint":"","explain":"<span class='basic_left'>Theo nh\u01b0 s\u1ed1 li\u1ec7u t\u00ednh to\u00e1n \u1edf c\u00e2u tr\u00ean, ph\u00f2ng ph\u1ea3i c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n 11,35m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2295},{"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":"Nh\u1eefng v\u1eadt n\u00e0o sau \u0111\u00e2y h\u1ea5p th\u1ee5 \u00e2m t\u1ed1t?","select":["A. Th\u00e9p, g\u1ed7, v\u1ea3i","B. B\u00eat\u00f4ng, s\u1eaft, b\u00f4ng","C. \u0110\u00e1, s\u1eaft, th\u00e9p","D. V\u1ea3i, nhung, d\u1ea1"],"hint":"","explain":"<span class='basic_left'>V\u1ea3i, nhung, d\u1ea1 h\u1ea5p th\u1ee5 \u00e2m t\u1ed1t, v\u00ec n\u00f3 m\u1ec1n v\u00e0 kh\u00f4ng nh\u1eb5n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2296},{"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":"V\u1eadt n\u00e0o d\u01b0\u1edbi \u0111\u00e2y ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m? ","select":["A. M\u1eb7t g\u01b0\u01a1ng ","B. M\u1eb7t \u0111\u00e1 hoa","C. \u00c1o len","D. T\u01b0\u1eddng g\u1ea1ch"],"hint":"","explain":"<span class='basic_left'>\u00c1o len m\u1ec1m n\u00ean ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2297},{"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":"Hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 \u00e2m kh\u00f4ng \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?","select":["A. Tr\u1ed3ng c\u00e2y xung quanh b\u1ec7nh vi\u1ec7n.","B. X\u00e1c \u0111\u1ecbnh \u0111\u1ed9 s\u00e2u c\u1ee7a bi\u1ec3n","C. L\u00e0m \u0111\u1ed3 ch\u01a1i \u0111i\u1ec7n tho\u1ea1i d\u00e2y","D. L\u00e0m t\u01b0\u1eddng ph\u1ee7 d\u1ea1, nhung "],"hint":"","explain":"<span class='basic_left'>Tr\u1ed3ng c\u00e2y xung quanh b\u1ec7nh vi\u1ec7n \u0111\u1ec3 c\u00e2y ph\u1ea3n x\u1ea1 c\u00e1c t\u1ea1p \u00e2m (ti\u1ebfng c\u00f2i xe, \u0111\u1ed9ng c\u01a1 xe, ti\u1ebfng ng\u01b0\u1eddi n\u00f3i, ti\u1ebfng m\u00e1y m\u00f3c\u2026) t\u1eeb b\u00ean ngo\u00e0i v\u00e0o trong b\u1ec7nh vi\u1ec7n gi\u00fap b\u1ec7nh vi\u1ec7n \u0111\u01b0\u1ee3c y\u00ean t\u0129nh.<br\/>Ng\u01b0\u1eddi ta th\u01b0\u1eddng s\u1eed d\u1ee5ng s\u1ef1 ph\u1ea3n x\u1ea1 c\u1ee7a si\u00eau \u00e2m \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 s\u00e2u c\u1ee7a bi\u1ec3n. V\u00ec si\u00eau \u00e2m c\u00f3 th\u1ec3 ph\u00e1t th\u00e0nh ch\u00f9m tia h\u1eb9p v\u00e0 \u00edt b\u1ecb n\u01b0\u1edbc h\u1ea5p th\u1ee5 n\u00ean truy\u1ec1n \u0111i xa trong n\u01b0\u1edbc.<br\/>Trong c\u00e1c ph\u00f2ng tr\u00ean ng\u01b0\u1eddi ta l\u00e0m t\u01b0\u1eddng s\u1ea7n s\u00f9i v\u00e0 treo r\u00e8m nhung \u0111\u1ec3 h\u1ea5p th\u1ee5 \u00e2m t\u1ed1t h\u01a1n n\u00ean gi\u1ea3m ti\u1ebfng vang, \u00e2m nghe t\u1ed1t h\u01a1n.<br\/>V\u1eady, ch\u1ecdn \u0111\u00e1p \u00e1n C. Hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 \u00e2m kh\u00f4ng \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong vi\u1ec7c ch\u1ebf t\u1ea1o \u0111\u1ed3 ch\u01a1i \u201c\u0111i\u1ec7n tho\u1ea1i d\u00e2y\u201d.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2298},{"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":"K\u1ebft lu\u1eadn n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang? ","select":["A. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t l\u00e0 nh\u1eefng v\u1eadt c\u00f3 b\u1ec1 m\u1eb7t s\u1ea7n s\u00f9i, g\u1ed3 gh\u1ec1","B. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m l\u00e0 nh\u1eefng v\u1eadt c\u00f3 b\u1ec1 m\u1eb7t nh\u1eb5n, c\u1ee9ng","C. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t l\u00e0 nh\u1eefng v\u1eadt c\u00f3 k\u00edch th\u01b0\u1edbc l\u1edbn","D. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m l\u00e0 nh\u1eefng v\u1eadt m\u1ec1m, kh\u00f4ng nh\u1eb5n"],"hint":"","explain":"<span class='basic_left'>V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m l\u00e0 nh\u1eefng v\u1eadt m\u1ec1m, kh\u00f4ng nh\u1eb5n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2299},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"H\u00e3y ch\u1ecdn c\u00e2u sai ","select":["A. \u00c2m ph\u1ea3n x\u1ea1 l\u00e0 \u00e2m truy\u1ec1n \u0111i trong m\u00f4i tr\u01b0\u1eddng v\u00e0 b\u1ecb m\u1eb7t ch\u1eafn h\u1ea5p th\u1ee5","B. \u00c2m ph\u1ea3n x\u1ea1 l\u00e0 \u00e2m d\u1ed9i l\u1ea1i khi g\u1eb7p m\u1eb7t ch\u1eafn","C. Ta nghe \u0111\u01b0\u1ee3c ti\u1ebfng vang khi \u00e2m truy\u1ec1n \u0111\u1ebfn v\u00e1ch \u0111\u00e1 d\u1ed9i l\u1ea1i \u0111\u1ebfn tai ta ch\u1eadm h\u01a1n \u00e2m truy\u1ec1n tr\u1ef1c ti\u1ebfp \u0111\u1ebfn tai m\u1ed9t kho\u1ea3ng \u00edt nh\u1ea5t $\\dfrac{1}{15}s$ ","D. \u00c2m g\u1eb7p m\u1eb7t ch\u1eafn \u0111\u1ec1u b\u1ecb ph\u1ea3n x\u1ea1 nhi\u1ec1u hay \u00edt"],"hint":"","explain":"<span class='basic_left'>\u00c2m ph\u1ea3n x\u1ea1 l\u00e0 \u00e2m d\u1ed9i l\u1ea1i khi g\u1eb7p v\u1eadt c\u1ea3n ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2300},{"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":"Gi\u1ea3 s\u1eed t\u00e0u ph\u00e1t ra si\u00eau \u00e2m v\u00e0 thu \u0111\u01b0\u1ee3c \u00e2m ph\u1ea3n x\u1ea1 c\u1ee7a n\u00f3 t\u1eeb \u0111\u00e1y bi\u1ec3n sau 1,2 gi\u00e2y. Bi\u1ebft t\u1ed1c \u0111\u1ed9 truy\u1ec1n si\u00eau \u00e2m trong n\u01b0\u1edbc l\u00e0 1500 m\/s. \u0110\u1ed9 s\u00e2u c\u1ee7a \u0111\u00e1y bi\u1ec3n l\u00e0: ","select":["A. 900 m","B. 1800 m","C. 3600 m","D. M\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c"],"hint":"","explain":"<span class='basic_left'>Qu\u00e3ng \u0111\u01b0\u1eddng m\u00e0 s\u00f3ng si\u00eau \u00e2m \u0111\u00e3 \u0111i l\u00e0: <br\/>S = v.t = 1500x 1,2 = 1800 m<br\/>Qu\u00e3ng \u0111\u01b0\u1eddng m\u00e0 s\u00f3ng si\u00eau \u00e2m \u0111\u00e3 \u0111i g\u1ea5p 2 l\u1ea7n \u0111\u1ed9 s\u00e2u c\u1ee7a bi\u1ec3n \u1edf v\u1ecb tr\u00ed \u0111\u00f3. V\u00ec v\u1eady, \u0111\u1ed9 s\u00e2u c\u1ee7a bi\u1ec3n l\u00e0:<br\/>h = $\\dfrac{s}{2}=$ $\\dfrac{1800}{2}=900$ m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2301},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi sai:<br\/>Hi\u1ec7n t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c ph\u1ea3n x\u1ea1 \u00e2m \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0o d\u01b0\u1edbi \u0111\u00e2y? ","select":["A. Tr\u1ed3ng c\u00e2y xung quanh b\u1ec7nh vi\u1ec7n","B. X\u00e1c \u0111\u1ecbnh \u0111\u1ed9 s\u00e2u c\u1ee7a bi\u1ec3n","C. Soi g\u01b0\u01a1ng","D. L\u00e0m t\u01b0\u1eddng ph\u1ee7 d\u1ea1, nhung"],"hint":"","explain":"<span class='basic_left'>Hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p soi g\u01b0\u01a1ng => c\u00e2u C sai. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2302},{"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":"Ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang Khi n\u00e0o th\u00ec tai c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c \u00e2m to nh\u1ea5t?","select":["A. \u00c2m ph\u00e1t ra \u0111\u1ebfn tai c\u00f9ng m\u1ed9t l\u00fac v\u1edbi \u00e2m ph\u1ea3n x\u1ea1","B. \u00c2m ph\u00e1t ra \u0111\u1ebfn tai tr\u01b0\u1edbc \u00e2m ph\u1ea3n x\u1ea1","C. \u00c2m ph\u00e1t ra \u0111\u1ebfn tai, \u00e2m ph\u1ea3n x\u1ea1 \u0111i n\u01a1i kh\u00e1c kh\u00f4ng \u0111\u1ebfn tai","D. C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p tr\u00ean"],"hint":"","explain":"<span class='basic_left'>Khi \u00e2m ph\u00e1t ra \u0111\u1ebfn tai c\u00f9ng m\u1ed9t l\u00fac v\u1edbi \u00e2m ph\u1ea3n x\u1ea1 th\u00ec tai c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c \u00e2m to nh\u1ea5t<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2303},{"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":"Trong ph\u00f2ng k\u00edn ta th\u01b0\u1eddng nghe \u00e2m thanh to h\u01a1n so v\u1edbi nghe \u1edf ngo\u00e0i tr\u1eddi v\u00ec:","select":["A. Trong ph\u00f2ng k\u00edn th\u01b0\u1eddng c\u00f3 ph\u1ea3n x\u1ea1 \u00e2m. Tai ng\u01b0\u1eddi nh\u1eadn \u0111\u01b0\u1ee3c nhi\u1ec1u \u00e2m ph\u1ea3n x\u1ea1 c\u00f9ng m\u1ed9t l\u00fac s\u1ebd nghe to h\u01a1n so v\u1edbi nghe \u1edf ngo\u00e0i tr\u1eddi","B. Ph\u00f2ng k\u00edn n\u00ean \u00e2m kh\u00f4ng tho\u00e1t ra ngo\u00e0i \u0111\u01b0\u1ee3c","C. Ngo\u00e0i tr\u1eddi \u00e2m thanh s\u1ebd d\u1ec5 b\u1ecb ti\u00eau t\u00e1n","D. Ph\u00f2ng k\u00edn n\u00ean kh\u00f4ng c\u00f3 s\u1ee9c c\u1ea3n c\u1ee7a kh\u00f4ng kh\u00ed do \u0111\u00f3 \u00e2m thanh d\u1ec5 truy\u1ec1n \u0111\u1ebfn tai ng\u01b0\u1eddi nghe h\u01a1n"],"hint":"","explain":"<span class='basic_left'>Trong ph\u00f2ng k\u00edn th\u01b0\u1eddng c\u00f3 ph\u1ea3n x\u1ea1 \u00e2m. Tai ng\u01b0\u1eddi nh\u1eadn \u0111\u01b0\u1ee3c nhi\u1ec1u \u00e2m ph\u1ea3n x\u1ea1 c\u00f9ng m\u1ed9t l\u00fac n\u00ean s\u1ebd nghe \u00e2m thanh to h\u01a1n so v\u1edbi nghe \u1edf ngo\u00e0i tr\u1eddi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2304},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"T\u00ecm c\u00e2u sai ?","select":["A. Ph\u00f2ng k\u00edn c\u00e0ng l\u1edbn ti\u1ebfng vang c\u00e0ng to","B. Trong ph\u00f2ng k\u00edn n\u00e0o c\u0169ng \u0111\u1ec1u c\u00f3 ti\u1ebfng vang","C. Ng\u01b0\u1eddi n\u00f3i ph\u1ea3i \u0111\u1ee9ng c\u00e1ch t\u01b0\u1eddng h\u01a1n 11 m m\u1edbi c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c ti\u1ebfng vang","D. Tai nh\u1eadn \u0111\u01b0\u1ee3c c\u00f9ng l\u00fac c\u00e0ng nhi\u1ec1u \u00e2m ph\u1ea3n x\u1ea1 th\u00ec s\u1ebd nghe c\u00e0ng to"],"hint":"","explain":"<span class='basic_left'>Ph\u00f2ng k\u00edn ph\u1ea3i c\u00f3 k\u00edch th\u01b0\u1edbc \u0111\u1ee7 l\u1edbn v\u00e0 th\u01b0\u1eddng kh\u00f4ng c\u00f3 \u0111\u1ed3 \u0111\u1ea1c m\u1edbi c\u00f3 ti\u1ebfng vang => c\u00e2u sai l\u00e0 B.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2305},{"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":"T\u1ea1i sao khi n\u00f3i l\u1edbn trong ph\u00f2ng to th\u00ec nghe \u0111\u01b0\u1ee3c ti\u1ebfng vang c\u00f2n trong ph\u00f2ng nh\u1ecf th\u00ec kh\u00f4ng?","select":["A. V\u00ec ph\u00f2ng nh\u1ecf kh\u00f4ng c\u00f3 ph\u1ea3n x\u1ea1 \u00e2m","B. V\u00ec ch\u1ec9 ph\u00f2ng l\u1edbn c\u00f3 ph\u1ea3n x\u1ea1 \u00e2m","C. V\u00ec ph\u00f2ng l\u1edbn kh\u00f4ng kh\u00ed lo\u00e3ng n\u00ean \u00e2m truy\u1ec1n \u0111i d\u1ec5 d\u00e0ng","D. V\u00ec ph\u00f2ng \u0111\u1ee7 l\u1edbn th\u00ec khi \u00e2m ph\u1ea3n x\u1ea1 d\u1ed9i l\u1ea1i \u0111\u1ebfn tai ta m\u1edbi c\u00f3 th\u1ec3 ch\u1eadm h\u01a1n \u00e2m truy\u1ec1n tr\u1ef1c ti\u1ebfp \u0111\u1ebfn tai m\u1ed9t kho\u1ea3ng \u00edt nh\u1ea5t $\\dfrac{1}{15}$ s \u0111\u1ec3 t\u1ea1o th\u00e0nh ti\u1ebfng vang"],"hint":"","explain":"<span class='basic_left'>V\u00ec ph\u00f2ng \u0111\u1ee7 l\u1edbn th\u00ec khi \u00e2m ph\u1ea3n x\u1ea1 d\u1ed9i l\u1ea1i \u0111\u1ebfn tai ta m\u1edbi c\u00f3 th\u1ec3 ch\u1eadm h\u01a1n \u00e2m truy\u1ec1n tr\u1ef1c ti\u1ebfp \u0111\u1ebfn tai m\u1ed9t kho\u1ea3ng \u00edt nh\u1ea5t $\\dfrac{1}{15}$ s \u0111\u1ec3 t\u1ea1o th\u00e0nh ti\u1ebfng vang. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2306},{"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":"Em kh\u00f4ng nghe \u0111\u01b0\u1ee3c ti\u1ebfng vang v\u1ecdng l\u1ea1i ti\u1ebfng n\u00f3i to c\u1ee7a em \u1edf \u0111\u00e2u? ","select":["A. G\u1ea7n v\u00e1ch n\u00fai","B. Hang \u0111\u1ed9ng","C. Trong h\u1ed9i tr\u01b0\u1eddng r\u1ed9ng c\u00f3 t\u01b0\u1eddng bao quanh","D. \u1ede s\u00e2n tr\u01b0\u1eddng gi\u1edd ra ch\u01a1i"],"hint":"","explain":"<span class='basic_left'>C\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c ti\u1ebfng vang \u1edf n\u01a1i g\u1ea7n v\u00e1ch n\u00fai, hang \u0111\u1ed9ng hay trong ph\u00f2ng (h\u1ed9i tr\u01b0\u1eddng) r\u1ed9ng c\u00f3 t\u01b0\u1eddng bao quanh \u2192 \u1edf nh\u1eefng n\u01a1i \u0111\u00f3 em c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c ti\u1ebfng v\u1ecdng l\u1ea1i ti\u1ebfng n\u00f3i to c\u1ee7a em.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2307},{"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":"Trong nh\u1eefng v\u1eadt sau \u0111\u00e2y, v\u1eadt n\u00e0o ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t, v\u1eadt n\u00e0o ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m? Mi\u1ebfng x\u1ed1p, m\u1eb7t g\u01b0\u01a1ng, \u00e1o len, m\u1eb7t \u0111\u00e1 hoa, gh\u1ebf \u0111\u1ec7m m\u00fat, t\u1ea5m kim lo\u1ea1i, cao su x\u1ed1p, t\u01b0\u1eddng g\u1ea1ch.","select":["A. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t: m\u1eb7t g\u01b0\u01a1ng, \u0111\u00e1 hoa c\u01b0\u01a1ng, t\u1ea5m kim lo\u1ea1i, t\u01b0\u1eddng g\u1ea1ch.","B. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m: Mi\u1ebfng x\u1ed1p, \u00e1o len, \u0111\u00e1 hoa c\u01b0\u01a1ng, \u0111\u1ec7m m\u00fat.","C. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m: Mi\u1ebfng x\u1ed1p, \u00e1o len, t\u1ea5m kim lo\u1ea1i, \u0111\u1ec7m m\u00fat.","D. V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t: m\u1eb7t g\u01b0\u01a1ng, \u0111\u00e1 hoa c\u01b0\u01a1ng, t\u1ea5m kim lo\u1ea1i, \u0111\u1ec7m m\u00fat."],"hint":"","explain":"<span class='basic_left'>V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t l\u00e0 nh\u1eefng v\u1eadt r\u1eafn, c\u00f3 b\u1ec1 m\u1eb7t nh\u1eb5n.V\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m l\u00e0 nh\u1eefng v\u1eadt m\u1ec1m, c\u00f3 b\u1ec1 m\u1eb7t kh\u00f4ng nh\u1eb5n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2308},{"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":"Trong nhi\u1ec1u ph\u00f2ng h\u00f2a nh\u1ea1c, ph\u00f2ng chi\u1ebfu b\u00f3ng, ph\u00f2ng ghi \u00e2m, ng\u01b0\u1eddi ta th\u01b0\u1eddng l\u00e0m t\u01b0\u1eddng s\u1ea7n s\u00f9i v\u00e0 treo r\u00e8m nhung \u0111\u1ec3 l\u00e0m gi\u1ea3m ti\u1ebfng vang. V\u00ec sao?","select":["A. T\u01b0\u1eddng s\u1ea7n s\u00f9i v\u00e0 r\u00e8m nhung l\u00e0 nh\u1eefng v\u1eadt ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t \u2192 l\u00e0m gi\u1ea3m ho\u1eb7c m\u1ea5t \u0111i ti\u1ebfng vang gi\u00fap \u00e2m thanh trong c\u00e1c ph\u00f2ng chuy\u00ean d\u00f9ng \u0111\u00f3 \u0111\u01b0\u1ee3c r\u00f5, to h\u01a1n.","B. T\u01b0\u1eddng s\u1ea7n s\u00f9i v\u00e0 r\u00e8m nhung l\u00e0 nh\u1eefng v\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m \u2192 l\u00e0m gi\u1ea3m ho\u1eb7c m\u1ea5t \u0111i ti\u1ebfng vang gi\u00fap \u00e2m thanh trong c\u00e1c ph\u00f2ng chuy\u00ean d\u00f9ng \u0111\u00f3 \u0111\u01b0\u1ee3c r\u00f5, to h\u01a1n.","C. T\u01b0\u1eddng s\u1ea7n s\u00f9i v\u00e0 r\u00e8m nhung l\u00e0 nh\u1eefng v\u1eadt ph\u1ea3n x\u1ea1 \u00e2m t\u1ed1t\u2192 l\u00e0m t\u0103ng ti\u1ebfng vang gi\u00fap \u00e2m thanh trong c\u00e1c ph\u00f2ng chuy\u00ean d\u00f9ng \u0111\u00f3 \u0111\u01b0\u1ee3c r\u00f5, to h\u01a1n","D. T\u01b0\u1eddng s\u1ea7n s\u00f9i v\u00e0 r\u00e8m nhung l\u00e0 nh\u1eefng v\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m \u2192 l\u00e0m t\u0103ng ti\u1ebfng vang gi\u00fap \u00e2m thanh trong c\u00e1c ph\u00f2ng chuy\u00ean d\u00f9ng \u0111\u00f3 \u0111\u01b0\u1ee3c r\u00f5, to h\u01a1n."],"hint":"","explain":"<span class='basic_left'>T\u01b0\u1eddng s\u1ea7n s\u00f9i v\u00e0 r\u00e8m nhung l\u00e0 nh\u1eefng v\u1eadt ph\u1ea3n x\u1ea1 \u00e2m k\u00e9m \u2192 l\u00e0m gi\u1ea3m ho\u1eb7c m\u1ea5t \u0111i ti\u1ebfng vang gi\u00fap \u00e2m thanh trong c\u00e1c ph\u00f2ng chuy\u00ean d\u00f9ng \u0111\u00f3 \u0111\u01b0\u1ee3c r\u00f5, to h\u01a1n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 .<\/span><\/span> ","column":1}]}],"id_ques":2309},{"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":"Hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 \u00e2m \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?","select":["A. Tr\u1ed3ng c\u00e2y xung quanh b\u1ec7nh vi\u1ec7n","B. X\u00e1c \u0111\u1ecbnh \u0111\u1ed9 s\u00e2u c\u1ee7a bi\u1ec3n","C. L\u00e0m \u0111\u1ed3 ch\u01a1i \u0111i\u1ec7n tho\u1ea1i c\u00f3 d\u00e2y d\u1eabn","D. L\u00e0m t\u01b0\u1eddng ph\u1ee7 d\u1ea1, nhung"],"hint":"","explain":"<span class='basic_left'>Ch\u1ecdn B, kh\u00f4ng ch\u1ecdn A, D v\u00ec tr\u1ed3ng c\u00e2y, x\u00e2y t\u01b0\u1eddng ch\u1ec9 l\u00e0m \u0111\u1ed5i h\u01b0\u1edbng. C\u00e2u C kh\u00f4ng li\u00ean quan \u0111\u1ebfn s\u1ef1 ph\u1ea3n x\u1ea1 \u00e2m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2310}],"lesson":{"save":0,"level":2}}