ĐỀ THI THỬ ĐẠI HỌC MÔN LÝ - TRƯỜNG ĐẠI HỌC TỰ NHIÊN pot

DE THr rrilI EAr ugc NAna zorc - LAN I MON: VAT LY Thdi gian ldm bdi. 90 philr, (50 cdtt ndc nghiQtn) Me d6 thi 136 C6u l: Cho cuong dQ Arrr chuAn la 10 -r2 W/m2. Tai di€m c6 cud'ng dQ Am ld 10 -5 W/m2 thi mfic cuong dQ Am ld bao nhi6u? A. 50 dB. B. 50 B. c. 70 dB. D.70 B. Cdu 2: M6 men qu6n tinh cua vdt rin dOi v6'i m6t truc quay c6 dintr A. chi phu thudc vdo kh6i luo'ng crja v6t. B. kh6ng phu thu6c vdo kich thu6c vd hinh dang cria vAt. C. phU thu6c vdo t6c dQ quay crJra vit. D. phU thudc vdo vitri trpc quay cria vAt. Ciu 3: Trong m6itrud'ng ndo bi€n dQ dao ddng giAm chdm nh6t? D. DAu. A. DAu r6t nh6t. B. Khdng khi. C. Nu6c. Ciu 4: Cho do4n mach diOn xoay chi6u gdm cuQn ddy mac nOi ti6p v6i tu di€n. DQ lQch pha cira di€n dp giira hai diu cuQn ddy so vo'i cud'ng dQ dong di€n trong mach ld 1. Oien 6p hiQu dung gi0'a hai - dAu tu diQn b6ng Jg tAn diQn 6p hi6u dung giila hai dAu cu6n day. DQ l€ch pha cria diQn dp gi0a hai dAu cu6n dAy so voi diQn 6p gifi'a hai dAu do4n m4ch tr€n ld D4I HQC QUOC GIA HA NqI TRUO'NG DAI HQC KHOA H9C Tu NHITN trnAi Prrn Chuy€n VQt ti, A.0. B. 7I 2 A. 2n A.40 m/s 8.80 m/s C,7\ 3 C. 2n C.20 m/s D. 160 m/s D.2n 3 Ciu 5: Chqn ph6t bi€u dring? A. Trong dao ddng cu6ng bric, tAn sd dao dQng 1u6n bang tdn sd dao d6ng ri6ng. B. Trong dd'i s6ng vd kTthudt, dao ddng cdng huong lu6n lu6n c6 lq'i. C. Trong doi s6ng vd ki thudt, dao d6ng tat dAn tu6n ludn c6 hai' D. Trong dao ddng duy tri tAn sd dao dQng chi phu thudc vAo ddc tfnh cira h€ dao d6ng. cau 6: Nguyen tic thu s6ng v6 tuytin dua vdo hien tuo, ng chinh ndo duo'i d6y? B.2nE 1e-u D.2nE X g*u A. Hiqu rl'ng Ddp-ple. B. CQng huong. C. Giao thoa s6ng. D. Cdm 0'ng di6n tt , CAu 7: Con lic ld xo gdm vat250 gmhc vdo ld xo c6 dQ cilng ld 100 N/m. Dua vAt d6n vitrf c6 lid0 t- Z cm r6i veo tho'i di6m t = 0 thi tiuy€n cho v4t vdn t5c ld 40 cm/s hu6'ng v€ vi tri c6n bing. Phuong trinh dao dQng cria con ldc ld A. 2rlisin(2}t+ nl 4)(cm) C. 2^D sin(z}t -3n / 4)(cm) B. 2J7sin(20t - n/a)(cm) D. 2",,D sin( 20t + 3nl 4)(cm) CAu 8: Con l6c don treo trong mQt.thang m6y chuy6n dQng chQm dAn d€u l€n trOn v6i gia tdc c6 d0 ld'n ld a. Chu ki dao ddng cta con ldc ld CAu 9: M6t so. i dAy kim lo4i cdng gif,ra hai di€m c6 dinh cdch nhau 2,4 m. Ddt m6t nam chAm vinh criu gAn rg:i day. Khi cho dong diQn xoay chi€u tAn sd 25 Hz thi tren dAy quan sdt duo. c s6ng dirng v6'i 3 br,rng s6ng. Vdn t6c truyOn s6ng tr6n ddy ld: CAu 10: Trong m6t doan m4ch RLC khdng phdn nhdnh g6m diQn tr6'R: 100 fJ, cuQn thuAn cdm L = l/n (H) vd m01ty diQn c6 diQn dung bi6n thi6n. HiQu diqn thC xoay chi€u ddt.vio hai dAu mach di€n c6 tdn tO f = SO ffr. DiQn dung C criatu di€n bing bao nhi6u thi hiQu di6n thii hieu dungtr€n tu diQn bing hiQu diQn th6 hiQu dung ddt vdo hai dAu mach diqn? Trang 1/5 - Ma dA thi 136 A. mirc cuong dQ am. C. cudng dd dm- Cflu 13: MOt v0t dao ddng diAu A. 10 -4 lQn) \F) B. 10 -4 /n (F) c. 10-3 lQn)(F) D. l0 -3 /n (F) CAu l1: Trong ddng co kh6ng ddng bO ba pha: A. r0 to quay ld Jo t6c dpng ctra til truong gAyboi ddng diQn ba pha trong ba cu6n d[y. B. t6c dQ quay cira rdto khdng phu thudc viro tAn s6 quay c[ra til tru'ong. c. r6to quay ld do duo-c kdo boi m6t bQ phan kh6c o'ben ngo2ri dQng co. D. dong diqn ba pha trong ba cu6n cidy la do rdto quay tao ra' C6u 12: Am sic ld I dec tru'ng sinh l;i cira Am phu thudc viro dbc tinh vAt ly ndo cira Am ? B. bi€n do 6m- D. dd thi dao ddng Am. hoi v6.i phuong trinh x=Acos(rot+<p). Tai thdi di6m pha c0a dao ddns ld 3nl4 th\: s theo chi6u ciuons v rc chidu du'ong cta truc toa d0' ' .i. vat chuy6n dQng theo chidu ciu'ong v6'i gia t6c. huong ngu'r B. v6t c6 van t6c v-d gia t5c cirng hu6'ng theo chi6u duo'ng cita truc tga d0' ;. ;;r1,"vA"-AO^g iguqr cniei auo'n[ v6'i gia tOc.hu6'ng theo chidu duong cfia truc toa d0' D. vdt cO van t6c vi glu iO" cung hud'ng nguo-c chiiiu du'ong cua truc toa d6' CAu 14: Trong mach dao dQng g6m tu.di6n c6 di6n dung C :2 PF va cuQn cAm c6 d6 tu cAm L: l0 mH. Ning luo-ng cua mach dao dQng bdng bao nhi6u ntiu vdo tho'i di6m cuo'ng dQ ddng di€n qua cu6n cam bang 1a thi hiQu diQn th€ tr6n tu diQn ld 100V A. 15mJ B.5mJ C'10mJ D'25mJ ciu 15: chon cau dfng' ltuin hodn theo thoi gian thi dao dong MotvdtdaodOngchiut6cdungciram6tngoailucbienthi€r on dinh cua vQt co: a. uien d6 dao dQng phu thu6c vdo ca ngo4i luc vd d4c tinh c0a h€. B. tAn s5 dao dQng chi phu thu6c vdo cudng d0 cira ngoai luc' C. tAn sd dao dQng ph\rthudc vdo dac tinh cira hq vd cia ngoai lu'c' D. bi6n dd dao dQng khdng phu thu6c vdo ngoai luc' Ciu 16: Chon c6u dirng' C6c diOm nim trOn cing phuong truydn s6ng sE dao dQng.nguo. c pha khi chiing c5ch nhau A. s6 nsuy€n lAn bu6'c s6ng. B' sO 16 ldn bu6c s6ng' ;: ;5 ffiian tin nr,a bu6.c song. n. so te lAn n6'a bu6'c song. Ciu 17: Tr€n mlt chft long c6 hai ngudn ph6t s6ng c6 cung bi€n dd, cirng tAn-s6 25 Hz vd cirng pha' Khoang c6ch giira hai nguSn s6ng lJ5 crn. van trli truyen song la 20 cm/s. K6t ludn ndo sau ddy ld oung / A. C6 13 vdn cuc daivd 12 vdn cr,rc ti6u' C. C6 12vln cuc daivd 12 vAn cuc tieu' B. C6 lzvAn cuc dai vd 13 vAn cuc ti6u' D. C6 13 vAn cuc dai vd 13 vAn cuc ti€u. B.5 m/s. C. 500 m/s. B. n =4ocos(l oont -[)V) D. 50 cm/s. cau 18: Cho m6t s6ng ngang truyan tr€n day c6 phuong trinh: u = 5cos(l0t-0,02x)' trong d6 u vd x tinh bing cm, t tlJi#; gjav frl Toc d0 aao JEng cuc dai cira phAn tri tr€n dAy khi c6 s6ng truvan qua ld A. 100 crn/s. Ciu 19: Con lic ld xo gdm vat nhd mic v6'i ld xo co d6 cirng 80 N/m. Trong mQt chu ky dao ddng .o', far di duq.c qudng Oirong ta ZO cm. Ndng luo-ng dao dQng cia con lic ld: A. 1000 J 8.0,+ J c.4 J D' 0,1 J Cf,u 20: TOc d0 truy€:n s6ng co hgc trong mdt m6i truong phu thudc vdo A.cudngdQs6ng.!.ujenf0cnangrrons6ng. C. bAn cnat mOi trud'ng truydn s6ng. D' tAn s6 song' Chu2l:Dat diCn 6p xoay chibu v?ro doan mach RLC mic nt5i tii5p. BiCt R: 10O, cuQn cAm thuAn c6 L: t 10r ' r- 7T _ (H),tudifncoC= ,- (r)vaorgnapgifrahai dAucuoncdmthuAnld Ltr.=20^JZcos(l00n'1+-\(v)' lon zlt -*'^' "'-*" '- l' 2' Bi€u thilc diQn dp gifr'a hai dAu doan m4ch l2r A. tr =4oJ7cos1l oont-|ltv) Trang215 - Ma dA thi 136 C|,u 22: Tai ngu6n O phuong trinh dao ddng cira s6ng ld a = l. cos (10 ttt) . Y dn t6c truydn s6ng trong mdi truo'ng ld v = 4 rnls. Tim nhAn xdt sai khi n6i vA quii trinh truy€n s6ng trong rndi tru'd'ng ndy? A. Li dd dao d6ng cira di6m M tai tho'i di6m t vd t * 0,2s ld nhu nhau. B. Hai di€m A, B c6ch nhau 0,4m lu6n dao d6ng ngu'oc pha nhau. C. S6ng tr6n mdt nu6'c c6 br"rd'c s6ng l": 0,8m. D. Cfic phdn til nu6'c kh6ng chuy€n do'i theo s6ng. Cdu 23: Mdy biiin rip ld thitit bi A. ldm tdng cdng su6tcira dong diQn xoay chidu. B. c.6 khA ndng bit5n ddi diQn 6p cira dong diQn xoay chidu. C. bi€n dOi dong di6n xoay chidu thdnh dong diQn mdt chidu. D. bi6n dditin s5 cia ddng di6n xoay chid:u. Cdu24: Tim chu k! dao ddng nh6 cira mdt thanh mAnh d6ng chAt chi6u ddi L=20 cm xung quanh ^J m6t truc ndm ngang di qua m6t dAu cira thanh. A. 0,45 s. B. 0,9 s. C. 0,73 s. D. 0,37 s. CAu 25: S6ng co hoc c6 tAn s6 f.:50H2, v6n t6c truy€n s6ng ld v trong d6 3,5m/s <v <4,5m1s. Hai di6m A, B tr€n mdt phuo-ng truydn s6ng c6ch nhau 18cm ludn dao d6ng vu6ng pha v6'i nhau. Gi6 tri cira v ld A.3,75mls \ B. 4,5rn/s C.4mls D.4,25mls CAu 26: TOng ho.p cria hai dao d0ng di6u hda cirng phu'o-ng xr = Asin(Znt-n/3) vd Xz = Acos(2nt-n/3) ld dao d6ng c6 phuong trinh: c. rr =4oJ7cos(i ooz,l +[)V) a. AlDsin (Znt - n l12) . C.2Acos(Znt) D. tt =4ocos(l 00nt+f,lVl B. 2Asin(2nt). D. AJ2 sin (2nt + nl 4) B.5cm D. kh6ng dCI dfr' tiQu d€ x6c dinh. Cdu27z Mdt ngudn Am ph6t Amcoi nhu mQt ngudn di6m vd ph6t.dm trong kh6.ng khi.theo mgi hu6'ng. GiA s0' mdi trud'ng kh6ng h6p thq Am. Khi tbng khoang cdch d6n ngudn l6n g6p. hai lAn thi A. mfic cud'ng dQ Am gidm di.hai lAn. B. mri'c cuong dQ 6m gidm.di bdn lAn. C. cudng d6 Am giAm di hai lAn. D. cudng dQ 6m giAm di bdn lAn. Cdu 28: Chon c6u sal. Edt vdo hai dAu mdt tu di6n m6t hiqu diQn th6 xoay chiAu c6 bi€n dQ kh6ng dOi vd tAn s6 thay ddi duo-c thi: di6n s6m oha so vdi I la 900. A. cudng d0 ddng diQn s6m pha so v6i hi€u diqn th€ mdt g6c B. c6ng sudt ti€u thu bdng khdng. C. biOn dQ ddng diQn tj'l€ thudn v6itAn s6 c[ta hiQu diQn th0. D. bi€n d6 dong dien ri lQ nghlch vdi di€n dung c0a tU diQn. CAn 29: Con l6c lo xo treo thing dring. Vdt m dang dilng ydn, truydn cho v6t m vAn t5c v hudng ''l ! 1' ^ ' '' isau At =4s vqt dilng lai lAn dAu vd khi d6 ld xo bi gi6n 15cm. LAy g = tnang dung xuong tn 20 lu'ng lal lan oau va Knl oo lo xo Dl glan l0m/s2. Bi€n dd dao ddng c0a v6t ld A. 15cm C. i0cm Ciu 30: Ph6t bi€u ndo sau d6y dirng khi n6i vd vAt rin quay quanh truc quay cO Ointrt A. Momen luc t6c dr,rng l€n vQt bing kh6ng thi vdt dilng y€n hoqc quay ddu. B. Mgt diOm b6t kj,ndm 6'tr€n vAt khi ndo ciing co,giat6c ti6p tuy6n khiic kh.ong . C. MOt diOm bAt kj, ndm o'tr0n vQt ludn c6 cA gia t6c hu'6'ng tdm vd gia t6c ti€p tuy€n. D. Momen lpc tiic dung l0n vdt duong thi ludn lim vdt quay nhanh dAn. CAu 3l: TAn sd crja suAt diQn dQng tao bo'i m6y phdt di€n xoay chidLr m6t pha ld 50H2. RO to c6 6 cf,p cuc. TOc d0 quay cta 16 to ld: A. 500 vdng/phirt. B. 600 vongiphftt. CAu 32: Giao thoa ld hiqn trro-ng: D. 1200 vong/phfrt. Trang 3/5 - Ma dA thi 136 C. 1500 vongiphrit. A. tdng hop c6cdao dQng cilng phu.ong cing tAn s6 cira ciic s6ng truy6n d6n cung m6t di6m. B. haiiOng truyOn d6n ctng m-gi AiC* lim cho phAn tir mditrud'ng tai do dao ddng v6'i bi€n dO , J .; bang tong bi€n d0 cila hai ngu6n. C. cOng hu'o'ng cila dao ddng ri€ng c0a phAn tri'mdi trudng vd dao ddng crr'6ng b6'c gAy boi ngudn s6ng. O. tOng hop c5c dao ddng ciing phu'ong cing tAn s6 vd ciing pha cira c6c song truy€n ddn cung nTdt ', A drem. CAu 33: Eid:u ndo sau dAy sai khi noi vir mriy ph6t diOn xoay chidu 3 pha ? A. Nguy6n t6c hoat d6ng cira Tdy 9Uu tr€n hi€n tu'o. ng c6m ring di6n tir. B. Tfi tO qr^y cua roto bing tAn s6 cira sudt diQn ddng do mdy ph6t ra. C. M6i ru9n iay cta phAn rlng c6 mdt su6t diQn dQng mang mQt tAn sd kh6c nhau. o. Ci ifr6 *a" giien tir: m6y phTt di6n xoay chibu ba p1a dtin noi sil dung bing c6ch m6c tam gidc hodc hinh sao, Cf;u 34: Cho mech di€n xoay chidu R, L, C mic nOi.ti6p. Di6n 6p hiQu dung hai dAu tq di0n, cuon day thuin cdm vd hai dA mach lin lugt le 20 V, 60 V vd 50 V. KCt lu4n ndo sau dAy Id d[ng? A. Cudng dQ ddng di6n tri'c thd'i scrm pha hon di6n dp hai dAu mech la I ' 4 B. Kh6ng dn dir kiqn ae tintr dQ 16ch pha gifr'a cudng d6 ddng di€n vir di6n 6p hai diu mach. C. HQ sd c6ng suAt cira dogn mach lil 0,6. D. Cud'ng dQ ddng diqn tri'c thoi tr6 pha hon diQn 6p hai dAu mach ld I ' 4 Cdu 35: Mdmen d6ng ll-rorrg cila mQt vAt rin quay qr-ranh truc c6 dinh l]r 5kg.m2ls, ddng nang quay cira vAt d6 le 25J. Tdc dQ g6c cira vAt ld A. 0,5 rad/s. B. 10 radls. C,2A radls. D. 5 rad/s. CAu 36: MQt ilng dAy c6 di6n tr6'r.vd hQ s6 tu cAm L. Dat vao hai dAu.6ng ddy mQt diQn rip khong d6i 6V, rhi cudng O9 aOng di6n trong 6ng dAy la 0,124. Dat vdo haidAu 6ng-dAymQt diQn 6p xoay chidu cO iAn rO SOftr vd gi61r! hiQu dung 100V thi cu'o'ng dQ ddng di€n hiQu dr,rng trong 6ng dAy ld 1A. GiA tri cria r vd L ld A. r:50O ; L:0,5H C.r=1000;L:0,28H B. r: 100Q ; L:0,5H D.r:50f); L:0,28H B. nguo-c pha. C. lOch pha nhau 900. D. lQch pha nhau 1200. Cdu 37: Trong mach dao dQng diQn tir, cud'ng d6 ddng di6n qua cu6n cZLm vd di6n tfch tr6n tu di€n bitin thi6n A. cirng pha. cau 38: Ta ggi c6c dQng co sil dpng tir trud'ng quay ld kh6ng d6ng bQ vi roto cria n6: A. quay v6'i tin sr5 nho hon tAn s6 quay cira tu trudng' B. quay ngugc chiAu quay cira tu trucng. C. quay vdi tAn s6 l6n hon tAn s5 quay crla til trub'ng. D. quay kh6ng dAu khi nhanh khi chdm phu thu6c vdo tdi' Cdu 39: VAn t6c cta s6ng di€n tir A. khdng phLr thudc vdo mOi truong truyAn song v.a tAn s6 cia s6ng B. phU thudc vdo m6i trud'ng trr,ry€n s6ng vd tdn s6 c0a s6ng' C. phU thu6c vdo mdi tru'o'ng truy0n s6ng vd bu6'c s6ng. O. ^t<frOng php thuQc vdo mdi tru'dng truytn s6ng, nhung phu thu6c vdo tAn s6 cua s6ng- Cdu 40: Phdt bi€u nio sau ddy sai khi n6i vC Oign til tru'd'ng A. Khi ril trud.ng bi6n thi€n theo thd'i gian thi n6 sinh ra di€n truo'ng. B. Dub.ng s6'c cria di€n truong xo6y ld nhffng dudng cong kh6ng khdp kin. C. Khi diQn truong bi6n thi€n theo thoi gian, n6 sinh ra tir trudng. D. TiI'trud'ng xo6y c6 duo'ng c6m ri'ng til bao quanh c6c duo'ng silc di€n trud'ng. CAu 41: C6ng huo'ng ld hiQn tuong bi€n d0 dao dQng: - a,.,t1uy O6ItuAn h-oan theo thoi-gian khitAn s5 cua ngoai h-rc bing tAn s5 cira dao d6ng tr,r do. n. cO gia tr! khOng dOi khi ngo4i lq'c cdn bing v6i luc ma s6t' C. c6 gi6 tri l6'n nhAt khi vAt dao ddng chiu tric dr,ing cira ngoqi luc thich hop. Trang 415 - Ma dc thi 136 D. c6 gia tri ld'n nhAt khi lch6ng c6 h,rc ma sdt t6c dLrng l€n vdt. Ciu 42: Trong mach dao dOng gdm tu di€n c6 di6n dung C vii cu6n cAm c6 dd tu'cdLm L xuAt hi6n dao d6ng Oigit. HiQu diQn t[e;uc dai tr€n tu di€n ld U. Vdo m6t thoi di6m, hi6u diQn th6 tr6n tu diqn ld u thi cud'ng dQ ddng di€n qua cu6n cirm khi d6 ld: tr A. u. /- VL B. (u -,)\F c. CAu 43: Coi tan tAm cria nhd mdy co'khi sil.1 canh du'dng Nguy6n TrEi ph6t 6m tAn s5 +:0.Ht M6t nguo'i c6ng nhan ra ve lsOm; di xe may v6i t6c dd 54 km/h trdn duong d6 sO nghe duo-c dm tAn s6 bao nhi0u? Cho t6c dQ dm thanh trong khdng khi ld 340 m/s' A. 430 Hz. B. 378,5 Hz. C. 470 Hz. D. 450 Hz' CAu 44: MOt mdi, thu thanh v6 tuy6n don gi6n g6m ft nhAtc6c bd phAn sau: l: anten thu; II: mach t6ch s6ng; III: mach khu6ch dai dao d6ng di6n tu cao tAn; IV: mach khut5ch dai dao dQng diQn tir 6m tAn; V: loa' C6c b0 phAn trong so- AO mOl cira mdy thu thanh cdn x6p theo thri'tu ndo? D.u D. I-II-III-IV-V. D. cr-rc ngin. A. i-III.IV-II-V. B. I.III-II-IV-V C. I-II-IV-III.V. Cdu 45: Song v6 tuy6n c6 tAn sd l5 MHz thudc dAi s6ng. A. dei. B. trr"rng C. ngan. Cdu 46: Mach chon song cira m6y thu s6ng v6 tLry6n g6rn cudn dAy c6 d6 tu cAm 0,04 mH vd tu di6n c6 diqn dung ld 16 nF. Bu'6'c s6ng cira s6ng vd tuy6n md m6y thu du'o-c ld A. 150 m B. 15 m. C. i,5 m. n r<n^* I'. IJUU ITI. Ch,u 47t Trong mach dao ddng diQn til li tuo'ng c6 dao dQng diQn til di6u hod v6'i tAn s5 g6c a: 5.l06rad/s.Khi diQntfcht0'ctho'i ciratudi€n lit q=JJ.tO-'Cthi dongdi€ntri'cthdi trongmachi: 0,054. Di6n tich l6n nhAt cfta tu di€n ld A.3,2.10-8 C B. 3,0.10-8 C c.2,0.10-8 c D. 1,9.10'8 C. CAu 48: Khi hidn tuo-ng giao thoa xdy rathi tai mot di6m: A. bi€n dd dao dQng t4i d6 bi6n thiOn.tuAn hodn theo tho'i gian. B. dd IQch pha cria hai s6ng tai d6 bi6n thi6n theo tho'i gian. C. pha dao-dQng cira phAn iu tOi truong tai d6 bii5n thi6n theo thd'i gian. D. pha dao d6ng cria phAn tri m6itrud'ng tai d6 bi6n thi6n di0u hda theo thoi gian. CAu 49: MQtvAtc6 phuo'ng trinh dao dQng ld x=Acos(2xt-n/ 3).Taithd'idi€m t: i sthi A. dQng ndng cira vAt dat cuc dai. B. dQng ning cira vAt dang tdng l€n. C. dQng ndng cira vAt dat cuc tieu. D. dong ndng cira vAt dang giAm' CAu 50: MQt hiQu dien thd xoay chidu c6 bi6n dd.vd tAn sd kh6ng O6i dat.vao hai dAu cira mdt.doqn , )' ^' I 'd 'rA rri .',At tl rliAn Kl' it nho l€n r6t l6n mach g6m m6t bien tro vd mdt tu diQn. Khi tdng ddn gi6 tri diQn tro'cta bi€n tro tt ri thi nhiit luo. ng toa ra trdn bi6n tro'trong mQt do'n v! thd'i gian sO bi6n AOi nhu th6 ndo? A. gilm dAn d6n mdt gi6 tri nho nhAt sau d6 lai tdng l€n. B. gidm d6n. . C. tdng dAn d€n m6t gi6 tri ld'n nhat rOi gidm d6n. D. tdng d6n. HET Khiii Chtty|n Li - DHKHTN - DHOG Hd N|i, tvww.chuyenly.edu.vn Trang 5/5 - Ma de thi 136 DAr r{oc Qtioc GIA FIA NOI TllU'ONG EAI HOC KIiOA IIqC TU'N{lltN hh0i f'fl H ('htt1,t1tt Vitl 111 MA (t6 rhi 513 I. puAN cI{uNG cFxo TAr cA cAc TfIi sINI{ (40 cau, tri'ciu I diin cau,10). CAu 1: CiLdpg d6 cldng di6n lirc thd'i cliay troirg mach dao d6ng LC l! ttlong lA: i:0,05sin2000t (A). Ctt$n dAy c6 dQ tu,cAm L = iO n1g. foi thoi cli6il .u:d'lg d6 dong cli€n tflc thdi trong mach bang gi6 tri cLlong c16 ddng diQn hiQLr clLrng thi hi6u di6n the giLra hai bfrn ttr di6n Id: A. 1,264 V [t.3,192V c.2,828 V D. s,056 V Cf,u 2: SLl triry6n song cuc nghn trong tlrr-r phdt song vo ttry6n dLlocthuc hiQn tlteo cdch: A. 1'ruyAn thing tir dAi ph6t diin mdy thu tai rnoi vi trf tr6n mat det' B. Truyen ttring til ddi ph6t ddn v0 tinh rOitruydn tiL v0 tinh c16rr nrdy thLi. C. TrLryAn til ddi phit vA phzin x4 trOn tAng cii6n ly d6n miy 1ltrt. D. PhAn xa rrhi6u lAn gifr'a tAng di6n ly vd mat dAt. Ciu 3: N,lach dao d6ng LC lj, tp'6ng clirng lAm nrach chorr s6ng cira rr6y tlttr vd trry6n cii6n g6m m6t ctr6n ciiy 106 *.r. c6 ci6 tu canr L H. Cho c :3.10s ui/s. D€ thLr cdng hLr'6ng nQt s6ng di6n tLl c6 brroc s6ng 2: 565 nr thi 4n di0n dLrng cira tr: cli6n C lz\: A. l,131r[r 11.A,57 PrF C.2,261-tF D. 3,39 p F Cf,u 4: Ciin cil vdo cALr tao ctia ntdy quang ph6, co tlr6 noi: A. M6i vacS mAu tr6n kirrh Arrh ld An6 clo' sic cira khe 6'ciia nrfy. B. I\46i vach nrdu tr6n l<inh Anh ld Anh don sic cira lang l<inh' C. M6ivaclr tlitt tr'€rr l<irrh Anh ld irrlt clon sac cira thALr kinh' D. Ce A, B, C dOu dLing. Cf;u 5: S6ng dirng dr-Loc hi1[ thdph tr6n rr6t soi clAy co hai clALrbi bLrQc cd dinlr, btidc s6ng cira s6ng bing: A. I(hoing c6ch giila hai birng s6ng hoac hainirt s6ng Ii6n ti6p. B. Mqt nira chiAr,r dAi cira dAy. C. Ca chidu cldi cira dAy. D. Hai lAn khoAng c6ch gifr.a hai bprrg s6ng hoac hai nfrt s6ng li6n ti6p. Ciu 6: Khi nguydn til dang 6n dinh o trang th6i diLng, nguv€tr tit: A.Kli6ngiraprfrr,,.,l-,,,,.r!c6th6bilcx4ndngluo-ng. B. I(hdngbiLcxanhLtngc6th€h6pthLr.ndrrglLlo-ng. C. C6 tn5 n6p rlp vd bilc x4 n[ng luo-ng. D. C6 nang lLro-ng giil nguydn kh6ng d6i. Cf;u 7: Hi€Lr di€n th5 hanr cira nrQt t6 bdo qlrang di6n Ii 1,5 V. Dat vdo hai clALr an,lt (A) vA cat6t (K) cna te bdoqr-rangdi0ntr€nn6thi€udi,3nth6xoaychiAu: LrAK:3cos(100nt++)ry) KhoAngtlroi gianDdngcliqrr J chay trong te bdo ndy trotg thoi gian 2 phfrt kti ti1 gOc thoi gian t : 0 li: A 40s 8.60s C.80s D. 120 s DE 'r'nn{ r'{[u DAI F{qg I{Ary 2010 - LAN MOF{: VA'{'LV Tltd'i gian ldm bdi. 90 pluit, (50 catt tdc nghiAnt) Cdu 8: Tai nguoi bilh thLiong nghe dLioc 16 nhilng 6rn c6 tAn s6 vA rrflc cud'ng d6 Arn nim trong l<hoAng: A. 16llz <f< 2CkHz, 0 dB < L < 130 dB C.0Hz<f< 16Hz. 0dB < L < 130dB B. 20kl'lz<f< 50hHz, 0 dB < L < l30dB D. 16l{z {f< 201<Hz, 130 dB < L < 200 dB Cf;u 9: Didu nAo dir6i clAy ld sai, khi n6i vd su'phdt vA tlru s6ng di€n tir ? A. Tropg rr6y thu, ,u' ,l1nn s6ng li sLl didLr chinh c16 dao 116ng ri0ng cira nrach LC co tAn s6 bing tAn s6 cira s6ng cli6n til do cldi ph6t (c6ng hLlong). il. O6 ph6t s6pg dign itr., rigLr.o'ita n.rdc phOi hop rn,3t rr6y phdt dao d6ng didLr hira v6i rnQt angten' C. Ee thLr s6ng di€n til', lgird'ita niic ph6i ho.'p rnQt Sngten voi m$t m4ch dao d0ng LC' D. De ph6t s61g cliqp tir, ngLroi ta mic ph6i hop nrdt mAy plr6t di€n v6'i nr6t dngtett. CAu 10: Cuong cl6 dong <Ji6n tflc thoi cira ddng di6n xoary chidrr cliay trottg ui7clt R, i,, C m5c,r6i tiep co -V darrg: i= J3sirr(l00zt-;l i.nl Iloi saLrtho'i gian ngan nhAtnAo dLr6i cldytinh tiL lirct- 0, cLLdngclldong 6 T; diqn tirc thoi co gid rri i - u^' n, 2 ^I a -e 400 B. 1, 300 c. 1, 100 D. 1, 200 Cffu 11: Chitiu m$t chirrn tia li6ng ngoai vAo niQt tAm l<6rn tich diQrr drri thi A. T6m k6r'r.r lrAt b6t di61 tich Am. Il. Dien tich t6nr k6rl lth6ng thay d6i. C. TAm k€m mAt b6t di6n tich du'ong. D. Ce ba phuong 6n A, B, C d6Lr sai Cf;u 12: Trong c6ch mic nrach cliQir ba pha hltth sao: A. hi€u aien tn6 giiia cl.iy pha vd clAy trLrrrg hda goi ld hieLr cli6n thrS dAy. B. hi6Lr di6n tlri5 giLia hai dAy pha goi Id hi6tr di6n th6 pha. C. d6iv6.i c6c gi6rri l'lielr dr-rngthi hi€Lr dien th6 clal,gAp .,6 lAn hi6u cli6n th6 pha. D. cLrdng d6 dong diOn tfic thili trorrg cliy trurrg hoa bing cud'ttg c16 dong c1i6n tlong ci ba 1;ha. Ctu l3: Mdt lrach c1i|n xoay chidLr g6m c6ll, C, L mic,,6iti6p, a: +F, ctrertr cley lf tLLotrg c6 c1Q tir cAm );l I . : ,: L - ' l-1. NgLr6n cli6n xoay chi6u clirt vdo hai ciiiu cira nrach clitn c6 hi6Lr di6n th6 ctLc dai Uo:200V, tAn s6 f : lt 50 Hz" Bi6t cu'drrg d6 dong di6n tirc thoi chay trong m4ch s6tr pha 7f 6 so vdi hi6Lr cliOn th6 tirc thoi o hai dALr doan mach. C6rtg suit ti€tr thu di6n cfra rlach dign niy lA: /' A. 10 \5 w B. l2,s .6 w c. 25 ^,6 w D. 37,5\6 W Ciu 14: Ngu'o'i ta dirng nrdy bi6n 6p tlng th6 tru6c khi trtrl,pp tAi cli€n narrg c'li xa l.i d6: A. GiAn hao phi diQn rrang do t6a nhiQt trdn dLrd'ng dAy tii c1i0n. B. Tang cudng d6 dong diQn hi6Lr durrg cAn truyAn di xa' C. Tang cdng su6t di6n cAn truydn tii di xa. D. Tang 116 s5 cdng strit cira dorrg di€n. Ciu 15: T'i6ng 6l ngoAi ph6,c6 rnirc cudttg d6 Arn lA cudng dd fun chr-rArr bing l0-r2 W/rn2. A. u54 - 5cos(40 nt)- it /4) (rnm) C. tlla:0 80 clfl. Tinh cLldng do Anr cLra ti6ng 6rr ngoii phO, U;6t B. u11:2,5cos(40 lrt- lr /4) (ntttt) I). rrnl:5cos(40 nr-r3 z/4) (mn) A. 10 6 Wim2 Cf,u 16: Chon c6u sai: B. 1o e W/rlr C. l0 3 W/m2 I). 10 a W/m2 A. Quang ph6 clo b6ng cldn di6n c6 dAy t6c n6ng s6ng li qLrarrg ph6 vach phht x4. B. euang plO tien tuc kh6ng phLr thu6c v2Lo bAn chAt cia vdt phAt s6ng nriL chi pliLr thu6c vio nhi6t dQ cira n6. C. M6i ngLry6p tO 56a hoc khi bi kfch thich, phdt ra c5c b[r'c xa c6 br-L5c s6ng x6c clinh vd cho rn6t qLrang ph6 vach ph6t xa ri6ng ddc trutrg cho nglr)/erl tO ey. D. Quang ph6 vacl-r hdp thLr cira rnSi nguyOn t5 co tinh chAt dic trtltrg cho rl6i rrgiryAn t6 d6. Ciu 17: Chi6Lr m6t chr}nr 6nh s6ng don sic c6 bLL6c s6rrg 2 =0,45l,tnr vAo cat6t cira rn6t t6 bdo quang di6n c6gi6.i hariquangdiQn 2o = A,66l.nn.'Choh:6,625.10-3aJs,c:3.108r.tt/s,e: l,6.10rec.D6 l6ncirahi6Lr cli6n th6 h5m t16 ddng quang di6n tri6t ti6u lioin todn ld: A. 1,756 V B. 0,878 V c. 1 ,3 I 7 V D. 0,439 V CAu.18: Hai rrgu6l ph6t song k6t hop S1, 51tr6n n-r5t nu'oc.lh1t.tu haidro d6ng cli.6Lr hda cirng plirLong, cirng tAn s6 f = 20H;,.i,,'rg bien dq a,:2,5 nnr vi cirng pha ban ciALr bang 0. X^eni rirtg birln dQ s6lg kh6ng tlray,d6i tr.ongqLr6 trinh trr,ry€1 sorig- Bi6t van_t6c^trLry6n song tr6n nrdt nrroc v:32 cm/s. PhiLong trinli s6ng t6ng hqp tqi di6rn M tr6p rnat nr-r6c (l\4 c6ch 51, 52 nhting khohng tLtong ilng cl1 :4,2 crrt, dr - 9 cnr) gay ra b6i hai ,.tg.'6" S1, 52 lir: Cftu 19: 'h'ong thi nghi6rr Y-6rrg r,6 giao thoa 6nh s6ng: zt - I tltl, D:2 rn, hai lihe S1,S2 drto-c chi6Lr bnng clrirnr 6nh sang tringi6 bLr6c s6ng ndnr tlorrg lilioAng tir 0,3811n cl€n 0,76 pL rrr. H6i nh[ing br,Loc s6rrg nd.o clLroi dAy co vAn sdr-rg nant triing nhau 6' cli6rn A trdn mdtr qttair sAt giao tlroa cdch v6tt s6ng trr-rng tittt mdt l<hoing x: 3 r'nrr.r. 4. 0,425 p m vd 0,625 lt rn C.0,45 p ni vir 0,65 trtnt A. lr > 12. C. Is = 12. CAu 20: MQt nrach dao ddng 96rl cLr6n tliuAn cAm L:50 pH vitLr di6n C: 1.5 nF. IJi6u cli6n th6 cu'c dai tr.6n ty di€rr Uo: I ,2Y.Xtrc ainn gia tri tfi'c thdi cira cudng dQ clong c1i6rr tai thd'i di6rn gi6 tri tilc thoi cira hi6r-r di€n th6 tr6n tLr di0n bing hi6u di0n thO hi6Lr clLrng cita n6. A. 14,7 IIA Il. 20,8 mA C' 29,4 nA Cf,u 21: Chgn cAu sai ve song cl0n tLr': A. S6ng cli6n tLl truy6n trong chAn l<h6ng vd tlotrg rroi nrdi trudng vAt chAt. B. S6ng di6rr tir c6 tnang n[ng lLto-ttg. C. S6ng dien tii tudn theo c6c dinh luit: lrLryAn thing, phAn xa, khftc xa, giao thoa, nhi6Lr xa. D. Ei6n tru'bng E vA tir tludng g Uien thi6n tr-rAn hodn vd lr.r6n vu6irg pha vdi nhau. Ciu22: MQt mach clao d6ng I-C ly tLr'6ng c6 tAn s6 dao cl6ng ri6ng f0:90 MIIz. M4clr ndy n6i voi InQt ang ten d6 thr-r s6ng diQn tiL. GiA sil hai s6ng c1i6n til c6 cilng ndttg lLto-ttg ttlturrg c6 c6c tAn s6 tttortg frng f, : 92 MI:z,f2:95 ]r4llz tluydn v.io ang ten. Goi bi6n c16 clao c16ng cira rnach fi'ng v6i hai tAn s6 nAy ld I1, 12. Ci6 tli cira 11 hay 12 s0 ldn hon gi6 tri cdn lai? B. Ir < Iz. D. C6 thil xiy ra cA ba phLLong 6n A, B, C tiry thu6c vio pha ban dAu cita song trLrydn c15n. CAu 23: M6t ddng co di€n ti€Lr thLr nr6t c6ng suAt P:300 W. Ddng cli0n chay qtra d6ng co c6 gid tri cuc dai I0 7f :4 A vA cliAnr pha a so v5i hi6Lr cli€n thd o'hai dALr d6ng co. Tinh hi6u di6n th6 cLrc dai Uo giti'a hai clALr dOng ita. J co. A.75 V I].300 V c.22Av D. 150 v Ciu 24: D6ng nang cira mQt vAt clao cl6ng di6Lr hoa biOn tlri€n tLrAn hodn v6'i tAn s6 f :5H2. Chu l<i dao d6ng cira vAt ld: A. 0,2 s B. 0,3 s c.0,1s I). 0,4 s Citr 25: Mdt cop lic ld xo c6 hC s6 din h6i l<: 60 N/rn treo thlng dilng vio nr6t gifi c.6 dinh. O vi tri cAn bang lo xo bi gi6l 5 cn. Cor.r lic dao d6ng didu hda v6i bi6n dd A : 3 cn-r. 'fai vi tri cao nlrAt cira vAt ndrtg, ld xo tdc dung vdo gi6 do'nrQt l\rc c6 d6 16n lA: A. 1,8 N B.ON C.3N D. I,2 N ,tT Ciu 26: M6t con lic ld xo clao ddng diALr hda vditAn s6 go. 0l: 5n rad/s vir pha ban dAu tp = -; rad. Hoi sau pror thoi gial ngin nhat nio clLi6i day (tinh tiL l<lii con lic bit dALr clao d6ng) d6ng rrlng dao d6ng bang tlrd rrang dao d6rrg. c. l, 60 bing chirng thu'c nghi6nl qllarl B. 0,5 1-t nt vd 0,7 5 7t nt D. 0,58 tr; m vi\ 0,72 pn B. Hien tuong qr-rang dAn D, I(hirc x3 6nh s6ng L D s 60 tlorrg khirrg clinh 6rrh sArrg co tirrlr chAt l). 10,4 nrA A.7 s B. 14, 60 60 Ch,u 27: HiQn tLro. ng nio sau dAy ld s6ng: A. Hi€n tuo-ng quang diQn C. Giao thoa 6nh sdng Ciu 28: Pha ban dAu cira clao c16ng didtr hoa: A. Chi phr.r tlir-rQc vdo su kich thich clao cl6ng: toa d6, vAn tdc ban dALr. B. Chi phu thu6c vdo g6c thoi gian t: 0. C. Chi pliu thudc vdo trttc toa ilQ Ox vi chidu cluo'ng cita n6' D, Phu tliudc vdo trurc toa d6, 96c tho'i gian vA sir kich thich dao d6ng. C6u 29: Trong thi nghiem Y-Ang vd giao thoa 6nli s6ng: a: 1,5 tttt't't, D = 2 rl. Vi trivAn toi thfl'ba kA ti| r'ln s6rrg trr.rng tAm cicir yAn'sdng trLr"ng tAm rndt l<hoAng r^:2 n.tnr. BrLoc song cita cltr-rrr anh saltg clort sic chi6tr A. 0,45 1r nr W.0,54 pt rn C.0,6 1t r"n f). 0,65 7z rrr CAu 30: Trong thi nghi6nr Y-Ang v6 giao thoa 6nh s6ng, hai l<lie S1,52 cluoc chi6Lr bing chirnr birc xa c6 bu6c s6ng l' Lr(4=0,63pm). Bi6t rrng vAn t6i thfi'3 I(e til'vAn sdrrg truirg tArn cua bu6c song 2, trirng v6i vArr t6i thfi'4 k€ tiL vAn sAng trung tdnr cila bu'6'c song .Lr. BLLdc song ) , cira chilir bilc xa lA: A. 0,45 1t t'n 13. 0,48 ;z m C. 0,5 1 yt rn l). 0,54 7r rn D. Dao dong t6t clAn Cfiu 31: I(hi bo qua rnoi lrrc c6n vd lLlc ma sft, clao clQng cna con lic ld xo li: A. Dao d6ng dLry tri B. Dao clong cu'6ng biLc C. Dao c16ng tir do C6u 32: Chon cAu sai: Anh sdng don s[c lA: A. Anh s6ng kh6ng bi t6n sirc nrA chi bi l€cli khi di qrra lang liinh Il. Anh sdng c6 budc s6ng x6c dinh C. Anh s6ng c6 tAn s6 xfc clinh Il. Anh sdng bi l6ch vzi cl6i rliiu khi cli qua lirng lifnh Cf,u 33: MOt soi dAy rrAnh dirn h6i AB ddi 2,5 ir clLroc cing theo phrLong r'lgang, trong c16 dALr B cd dinh, dAu A dLloc rLrng nhd' mot clr-rng cu d0 tao song diLng tr6n dAy. TAn s6 nrrrg f c6 th6 thay rloi dLroc gid tri trong kho.lng tir'93 I'lz d6n 100 Hz. Ilidt t6c tlo truydn s6ng lr'€n cliy v: 24 nls.lloi tAn rO tpnai nhAn gid tri ndo .; dLrtii driy de trirr di1' c6 s6ng diLrrg: .d. 98 Hz l|.95 Hz C. 1001-lz l). 94 Hz. Cf,u 34: Tlong cluang pho vach c*a ngLry€n tir hiclr6, vacl-r ilng vo'i sLl chLry6n cira 6lectron til qLry dao M v€ qu! dao K li: ll = S, 1026/sru , v+ch rl ng vd'i bLro'c srlng clAi nlrdt tlong cldy Ban-rre ld, 2, = 0,65661tut . BLr'6c s6ng ddi nlrdt cira d$y Lai-rnan lA: A. 0,0608 prir 8.0,11tr6 $nr C. 0.1 824 prtr D.0,24321,tttt Cf,tr 35: Dat vAo hai diu rn6t thi6t bi cii€n hi6u di0n th6 u:220cos(l00nt-r xl6) (V) tlri co clong di6n i: 2sin(100nt + nl3) (A) chay qLra thi6t bi. G;6 tri cira c6rrg suit ti6Lr tlru cfra macli: A.220 W. c.440 W. B. 1r0 w. D. Chua dfi th6ng tin dd tinh. Cf,u 36: Con lic don c6 chidu ddi l:20 cnr. Taithd"i di6m t:0 con lic du'o-c trLrydn vAn toc 14 crn/s til vi trf cAn bing theo chiCLr clr-Long cira truc toa d6. L.4y g - 9,8 n/sz. PhLrong trinli clao d6ng cLia con lac lA: A. 20sin(7t + nl2) (cn). B. 20sin(?t - n/2i {cnr). C" 2.sin(7t) (cm). Cf,u 37: Bi6u thflc trio dudi clAy khdng dirng d6i v6.i hi6n tuo-ng quang cli6n: I - Itc ltc l]. lif- A+:/rir,o,,,,, C. ::+eU,, 2 ""'"' I )o D. 2sin(7t + n/2) (cnr). D. E=!!*\,,,,] ) )o 2 urti\ A.hf:eU5-A Cffu 38: Rdto cira nr6y ph6t difn xoay chidLr m6t pha li phin cim c6 4 cdp cuc quay v6i vdn t6c g6c id bao nhi6u {tinh theo dsn vi radls) d€ tAn sd cira ddng diOn tao ra b6'i nrdy phdt ld 50 IIz? A. 12,5 B. 7s0 c.7B,s D. 200 Ciu 39: Chon c6u sai: Trorrg slr lan tluy€n cira s6ng: A. Nhfrrrg di6m crich uhau nr6t s,3 rigLry6n lin uira bii6c s6ng thi lLr6rr dao cl6ng ngLro-c pha nhau. B. Tin s6 s6ng kh6ng rhay d6i khi tlLrydn tu m6itrrrdng rtdy sang nr6i tLLLd'ng hhAc. C. Tdc d6 truy€n s6ng ld tdc d0 tri.rydrr pha dao cl6ng. D. NhLlng di€m niur t16n cirng nrQt phLtorrg trLrydn s6ng vd c6ch nltau rrr6t sO ngLry6n lAn bLroc s6ng lu6n dao d6ng cirng pha v6'i uhau. Ciu 40: Cho mach di6rr xoay chidLr g6m rrdt cudn dAy co dd trr cAr-n L vd di€n tr6 R mic nOi tiep v6i rr6t tLr di6n C. Ddt vdo hai dAu mach di6n rrrQt lii6u di6n th6 u: 100J2.ort0Qzt (V). l(hi d6, hi6u cli6n tli6 hi6Lr dung c1o duo'c trOn hai ddLr tLr di6n c6 giri tri gAp 1,2 lAn hi€u di0n th6 tr6n liai dALr cuQn d6y. Neu nOi tit hai dALr '' . '' ; tu di6n thi thAy cudng dQ ddng di€n trong m4ch c6 gi6 tri hi6u dgrrg khdng thay ddi vd blng 0,5 (A). IJoi cArl khdng 21, cta cu6n dAy nhAn gi6 tri nAo dLr'6i dAy: .4.80 f) B. 120 f) c. 160 f) D. r80 Q [{. Pr{Ar{ TU cI]oN. Thi sinh clti eTtro'c chorl I:irn nl0t trong 2 phAn satl: A) PI{AN CO frAN (10 cau, tri'ciu "{1 dan cSu 50)" PbQqe} ba!! ho:ic l'hin n4nq cao. CAu 41: Dao dQng duy tri ld dao c16ng: A. du'o'c cirng cAp th€m ndrrg ltLong vtii c6ng su6t kh6ng clOi theo thdi gian. B. c6 tAn sO Uing tAn si5 crha ngoai lLrc t6c dqng 1€n vdt dao d6ng' C. c6 bi6n d6 giArn dAn theo thdi gian. f). cJir.o c bir lai phAn nang luong hao phirnd hh6ng lAnr lhay cl6i chLr dao d6ng cira hQ. Ch642:M6tvAtdaodQngdi6uhdaruantheoqLrylLrit: x:6cos(2,t-+)(crn).'l-ai thoi tliirlt1 vAtcolicl6 6 I xr :3 crn vd vAn tdc du.ong thi 6 thoi cliem l s ti6p theo vat o li c16: J A. -3 crn B. 3 cm C. - 6 cnr f). 0 crr Cf,u 43: IliSn thi6n vAn t6c cira m6t vAt dao dQng di0Lr hod sdrn hay rlE pha bao rrhi0u so v6i biOn thi6n li d6 dao d6rrg? A. T16 pl'ranl2 B. fr6 phanl4. C. S6n phanl2. D. Sonr phanl4 Ciu 44: MQt con lic do1 g6n-r rr6t qLra cALr c6 kli6i luo. ng nr : 0,2 l<g treo vio dALr Ilot soi diy kh6ng giarr, f.froi f ua.ng f.|o',g dling ii6 .? .l,ie ,icli'i 1: 0,5 rl. Con lirc dao ct6ng cli6Lr hda quanh vi 1r"i cArr birrg cira n6. LAl' g: l0rn/s2. XAc dinh cl6 lon cira luc h6iphuc lihi v0t di qLra vitricri liclO s:3ctn: A. 0,12 N B. 2,12 N c. 2 N D' 2,06 N Cjiu 45: M6t m6y biiln 6p c6 cAc cuQn dAy ro "Ap, thil cAp cieLr lli tLrdng vdi s6 vong dAy ttLorrg [lng N,, Nz \T (l\: l0). Mdy bi6n 6p c6 hi6Lr s,r5t H :95 o/o, cudng d6 hi6Lr dung cira ddng cli6n xoay chi6u ch4y o cLtorr .N, tnir c6p 12- 1,9 (n), Biet h0 s6 c6ng suat ci," rlach so cAp vd thil cAp dCLr bing l. Cudrrg d6 hi6Lr dLrng cira ddng di6n xoay chi€u chay o cuOn so cdp ld: A. 0,20 A ll. 0.18 A c. 0.19 A D,20A Cjiu 46: Chi,lu mdt chim 6nh sirrg tinr vi\o nr6r tirn gd son nriu cl6, ta thAy tdn 96 c6 nrAu: A. D6 R. Xanh C. Den D. Tinr Cfiu 47: Chi6u nr6t chirrr 6nh s6ng rlorr sac c6 bLL6c s6ng )"=0,65ptnt vd c6ng strAt P: 12,5 W vdo cat6t cira rr6t tti udo quang c1i6n (Z .lo) Bi6t ring cir' 1000 plr6t6n d4p vdo cat6t thi c6 1 dlectron bat ra. cho h : 6,625.10-3aJs,c:3.108ni/s,e: l,6.l0reC.Cudngd6ddngquangdiQrrbaohdalA: A. 13,082 rnA 8.3,27i mA C' 9,812 mA D' 6,541 rrA CAu 48: Chi6Lr m6t chirlr inh s6lg clorr sic bu'6c s6ng 21 tiL rru6c co chi5t su6t Irl vAo thiry tinh co chitit sLrAt 12. Bg6c s6ng 2 2 cita cliitrn 6nh sing don sic triy truydn trong thiry titrh li: A. 1, =\4 11, t1^ l|. )', = -L.1, 11t c. 7, =e!-).s", I'12 - 11l l). 1., = ( "t ).4 l'l) * 1'll Ciu 49: Cho rnach cliel xoay clri€u 96nr ba phin tir L, R, C mic nOitiCp theo thil tLl cl6. CLrQn day lli tLL6ng c6 0.2 l0-r I . do tu cim l-: u'u H. C: '" F. Ngr-r6n di€n xoay chiOu dat vio hai clAu mach clign c6 hi€u ciiOn thO hi6ir tr 8lr 1 dung kh6ng aOiva tAn sti f :501'lz. Bi€t ur-n l6ch pha 1 so v6i LrB6. Hdi R nh4n giir tri ndo dLr'6iddy: '1 A.40fl " l]. 30 (-) C. lOO l). 20 f) CAu 50: C6 tne tao ra tir tlllong qtray bing dong di6n xoay chi0r-1 nrQt pha [h6ng? A.C6tne,bingc6chchobaddngm6tphaviobacu6ndAydatlechnhart 120otlongstato. B. C6 th6, bing c6ch n6i hai cu6n dny dflt l€ch nhau 180o trong stato, vio mang cli6n rnQt pha, (mOt cr-rOn nOi tru'" tiOp, mQt cu6n n6i qtta nl6t tLr di6n). C. Iih6ng th6. D. C6 tne, bing cAch n6i lrai cr.rgl dAy dlrt l6ch nhaLr 90o trong stato, vio nrang clien nrot pha. (nr6t cLi6rr nrli trgc ti6p, m6t cuOn n'ii qtta nr6t tu cli€n). [...]... ,,,,6t iou i.ti-,iqt ,,rut mq.cir tiray d6! niru tii5 : D" Gihiir d} 2 r1tn' C" Ting 1,En n,l3 IE Kirdng A Cia*'Oi n,l: I-: " : A; nAo? rioi 1dn' ('4 fwdc E)" i]IgAN runruc qro cAq: Tkf sinlt c!$ daa.-c ckan {ir1t nyt tr:a:g lrai phi:n 4-, W-ep-c-tw.q4gtt'iil e-q!?-t4,{im-.iWcLu-tLegw-I:ldt-Al}sft a:5@ tHet phai ld mOt chtrydn d$irg Cdm 4tr: Pli6t hiqn r:han dinh sai Dac AOngTflo AiOu nOa nnat " A c6 r'Qn... cLha vqt tang 2 lin thi d6ng nang quay cita v4t tang 4 IAn D Khi rndrnen d,3ng lLro-rrg cira vAt tang bao nhiEu lAn thi tndtrett qu.ln titrh clra no ciirtg tartg bay Irhie Lr larr -, -: HFT - , {, ^, : L1 |- DHKHTN - DIIQG HA Kltoi Cittrl'1tt Arci ilsr HQc T'RTIO}.IG PE{ QUGC GEA F{A NQI , I{}{CA E{OC T'EIi-THTEN ' g(hdii T'EIPT Chu3'6re VAt X,i DE T'5{{ TE{Ll'F}+nFqA s,AN S - IVAF*{ 2CIlCI i\40N:... 1530H2' CAu 54: M6t doirn tdu c6 chi€r-i cldi tinh L chuy6n dQng thing ddiu v6'i t6c d0 v so voi inQt quan vi6n ngdi canh duong ray Quan sdt vi€n do do dugc chiOu ddi cua no blng A L I) _!-D -_ L c /r-v- a1 r-^/i-f \lc- s6t r, lvD L.li + Vc' Vc' Cflu 55: ph6t bi6u ndo sau diy sai kiri noi vA chuy6n ddng cluay cira m6t vdt rin co truc quay cd dfnh ? A Khi vat quay deu thi nhfing di6rn cdng xa truc quay... dQ ddng cuc dai Io trong mach r l/o = il'no D o^ -fvL {- =! 4at r ar i ^ t-0 drtl sj6ng'hau' quans ph6 vach cua msi 'guven rE nai' tren rndi nc* toi' "Pi*,"1 "a mdnh B" r"quang pii6 ,u.rir c,la n-,.,r','rg.,r,1,, lu lr"ie t?:l,rye,nhaur' 'iO'g td kl6.r: rilia-* ld ki6c C" Quar .-, € pt 6 i,acli criia nl,iing nguy6n t i ,t r.s cli€^ ph6ng qr-ra thi phht- ra q'\J,ngphd va'cli' D I.,,16r khdi tcirl ],,"t;.1'",;... c6u 6,0: h46t t.,: rji6n vo,i r1i€n dLrng c: iOprF duoc nap l*o-ng ciizL'iu riiii' iiclr tran tu ciie'va-o luc ci6 co i-not irri'a n5'ng ciieri qr_r-a i'61o'on,JAy ii tuo.'g.-ffrdra'iqn ci6"y chuy6n thdnir n[ng luo-ng trciig cudii q ' A' q t0,tlu,]7,JrC ',i':| q = z:a,00']/,ttl2C C|" q _ !0,00a14i42c |D" -: |0,0000707C ''-vi1i.1e7 616 - llii L;i ihi :' lt' DAI FIOC QUOC GIA rXA NqI TFTU.ONG DAI INOC... i= t0J3 cos(l00nt +i, doan rn4ch ld B i = 5JI ) ^ (H) thi n 4A N6u dEt vdo hai dAu doan mach ndy di€n 6p - 4l V thi bidu thric cira dong diQn trong A i=5cos(l00nt+ilo :0'l cos(] oont - I, ^ D i=5cos(100nt-il^ 'frarro 1lA rJA thi i09 Ciu 8: Mdt mach diQn g6m diOn tro R : 200 f), cudn dAy 11'r.,6t-, cAm L :ZlnIl, vd tu di€n c6 thd thay d6i di0n dr-rn-q C Mic.rAo hai dAu rnach di6n hi€u di6n thd xoa1, chi€u... tirdm ni6t do4n bdng 7,9 cm, thi chng trong khodng thoi gian At Ciu '1,.,,,^^ 1lA l\,4; ,{A rl-i ?OO : n6 tliuc hiQn duo c 39 dao d6ng Cho gia t6c tror-rg truong g 9,8 il/sr Chu ki dao d6ng cua cori l5c khi chua tdr-rg chi6u ddi 1d: r} 1 /?< J D 0.475 s !r l-a / -' A 1,475 s Cdu 19: O ddu xuAt hign diQn tu trudlg bi6n thiOn? A Xung quanir rnQt diQn tich c6 dinh 4 B Xr-u-rg quanh m6t tia lira di0n'... Uittg nlifrng doan'bihg 1,5cm 0,5 giAy thi vat fai "'a" "a"nii dQng cria vAt: 1,5cm, tinh ning lugng dao , J D Z,?S.l 0-1 J l)'z''2 c.4,5'1 0-' J' 8.2,25.1 0-3 J A.4,5,1 0-4 J hydro c6 bi€u thitc Cdu 32: Bitit c6c muc ni.ng lugng ctra cfc tr4ng th6i dimg, trong nguy6n tu g"=-tgo/rl.gi6trengkhinguy6ntuchuy6ntirmircn:6xu6ngmircfl=1'thin6pht.t:'abircxac6 i"O" *ng %1.10-sm ffri ng.typn tir chuy€n tu mitc n... ld; r: '6; - radls rn l' Girii: Phuong trinh ly dQ currg: s - s6.sitr(u,rt I q) c6: ,= J u= =l! =2crrr Do tai 0 ^l+=./2{ \i !o,z thoi di6nr t:0, r,Ai dQng ld hdm cosin) - / r / ,-t t ''1 ,1/,h t'' .- r o'vj tri cln bfng vd di theo chiAu du.ong n€n g:0 (ch* ii = s = 2sin(7i) (cm) /' ( : 2cos(7t * ni2) (cm) f^i* klrx kU rp 7 - -nlL trong lruong hop hiinr dao / ^-' h Khbi TII FT Chuydn Vdt L! - DHKHTN lld... con D 450 vdng/phirt ('l- lic ld xo dao dQng diAu hda v6i phuong trinh x=8cosl:,_ -\ 1)A^1 Tai tho'i ; ' ,.i ,.-r .,^.^.,tt-!^AliAA' diern r, v?t o vi trix, = *4 cm vd di theo chi6u duong Sau 0,5 s kd tu thoi di€m t, vdt d vitri co li d0: A.4crn B .-4 cm C.Scm D .-8 cm tr8: Mdt con lic don g6rn mot vit nho cO kh6i luo-ng m :200 g, treo o ddu m$t scri dAy m6nh, chi6u ddi I duoc kfch thich clio dao d6ng di€u . loa' C6c b0 phAn trong so- AO mOl cira mdy thu thanh cdn x6p theo thri'tu ndo? D.u D. I-II-III-IV-V. D. cr-rc ngin. A. i-III.IV-II-V. B. I.III-II-IV-V C. I-II-IV-III.V. Cdu 45: Song. ckan {ir1t nyt tr:a:g lrai phi:n ('4 fwdc E)" 4-, W-ep-c-tw.q4gtt'iil e-q!?-t4,{im iWcLu-tLegw-I:ldt-Al}sft a:5@ Cdm 4tr: Pli6t hiqn r:han dinh sai. Dac AOngTflo diqn? Trang 1/5 - Ma dA thi 136 A. mirc cuong dQ am. C. cudng dd dm- Cflu 13: MOt v0t dao ddng diAu A. 10 -4 lQn) F) B. 10 -4 /n (F) c. 1 0-3 lQn)(F) D. l0 -3 /n (F) CAu