DeCtLiPb_M132

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    B GIO DC V O TO

    THI CHNH THC(thi c 06 trang)

    K THI TT NGHIP TRUNG HC PH THNG NM 2008Mn thi: VT L - Phn ban

    Thi gian lm bi: 60 pht.

    M thi 132

    H, tn th sinh:..........................................................................S bo danh:...............................................................................PHN CHUNG CHO TT C TH SINH (32 cu, tcu 1 n cu 32).Cu 1: Khi ni v thuyt phtn nh sng (thuyt lng t nh sng), pht biu no sau y l sai?

    A. Vi mi nh sng n sc c tn s f xc nh th cc phtn ng vi nh sng u c nnglng nh nhau.

    B. Bc sng ca nh sng cng ln th nng lng phtn ng vi nh sng cng nh.C. Trong chn khng, vn tc ca phtn lun nh hn vn tc nh sng.D. Tn s nh sng cng ln th nng lng ca phtn ng vi nh sng cng ln.

    Cu 2: Mt sng m truyn trong khng kh, trong s cc i lng: bin sng, tn s sng, vntc truyn sng v bc sng; i lng khng ph thuc vo cc i lng cn li lA.bc sng. B.bin sng.C. vn tc truyn sng. D. tn s sng.

    Cu 3: Trong th nghim giao thoa nh sng ca Y-ng (Young), khong cch gia hai khe l 1 mm,khong cch t mt phng cha hai khe n mn quan st l 2 m. Chiu sng hai khe bng nh sngn sc c bc sng . Trn mn quan st thu c hnh nh giao thoa c khong vn i = 1,2 mm.Gi tr ca bng

    A. 0,65 m. B. 0,45 m. C. 0,60 m. D. 0,75 m.Cu 4: Vi f1, f2, f3 ln lt l tn s ca tia hng ngoi, tia t ngoi v tia gamma (tia ) th

    A. f3 > f2 > f1. B. f1 > f3 > f2. C. f3 > f1 > f2. D. f2 > f1 > f3.Cu 5: Mt on mch in xoay chiu gm in trthun R mc ni tip vi tin C. Nu dungkhng ZC bng R th cng dng in chy qua in trlun

    A. chm pha2

    so vi hiu in thhai u tin.

    B. nhanh pha4

    so vi hiu in thhai u on mch.

    C. chm pha4

    so vi hiu in thhai u on mch.

    D. nhanh pha

    2

    so vi hiu in thhai u on mch.

    Cu 6: Khi ni v tnh cht ca tia hng ngoi v tia t ngoi, pht biu nosauy l sai?A. Tia hng ngoi v tia t ngoi uc tc dng nhit.B. Tia hng ngoi v tia t ngoi cng c bn cht sng in t.C. Tia hng ngoi v tia t ngoi u l cc bc x khng nhn thy.D. Tia hng ngoi c bc sng nh hn bc sng tia t ngoi.

    Cu 7:t hiu in th tUu cos2= vo hai u mt on mch ch c tin C th cng dng in tc thi chy trong mch l i . Pht biu no sau y l ng?

    A. Dng in i lun cng pha vi hiu in thu .B. Dng in i lun ngc pha vi hiu in thu .

    C. cng thi im, hiu in thu chm pha2 so vi dng in i .

    D. cng thi im, dng in i chm pha2

    so vi hiu in thu .

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    Cu 8: Khi ni v phn ng ht nhn, pht biu no sau y l ng?A. Tng ng nng ca cc ht trc v sau phn ng ht nhn lun c bo ton.B. Tt c cc phn ng ht nhn u thu nng lng.C. Tng khi lng ngh (tnh) ca cc ht trc v sau phn ng ht nhn lun c bo ton.D.Nng lng ton phn trong phn ng ht nhn lun c bo ton.

    Cu 9: Gi sban u c Z prtn v N ntron ng yn, cha lin kt vi nhau, khi lng tngcng l m0, khi chng kt hp li vi nhau to thnh mt ht nhn th c khi lng m. Gi E l

    nng lng lin kt v c l vn tc nh sng trong chn khng. Biu thc no sau y lun ng?A. m = m0. B. E =

    2

    1(m0 - m).c

    2.

    C. m > m0. D. m < m0.Cu 10: Hai dao ng iu ha cng phng, cng tn s, c cc phng trnh dao ng l:

    )4

    cos(31

    = tx (cm) v )4

    cos(42

    += tx (cm). Bin dao ng tng hp ca hai dao ng

    trn lA. 5 cm. B. 12 cm. C. 7 cm. D. 1 cm.

    Cu 11: Mt con lc n gm mt hn bi nh khi lng m, treo vo mt si dy khng dn, khi

    lng si dy khng ng k. Khi con lc n ny dao ng iu ha vi chu k 3 s th hn bi chuynng trn mt cung trn di 4 cm. Thi gian hn bi i c 2 cm k t v tr cn bng l

    A. 0,75 s. B. 0,25 s. C. 0,5 s. D. 1,5 s.

    Cu 12:t hiu in th tUu cos2= (vi U v khng i) vo hai u mt on mchR,L,C mc ni tip, xc nh. Dng in chy trong mch c

    A. gi tr tc thi ph thuc vo thi gian theo quy lut ca hm s sin hoc cosin.B. cng hiu dng thay i theo thi gian.C. gi tr tc thi thay i cn chiu khng thay i theo thi gian.D. chiu thay i nhng gi tr tc thi khng thay i theo thi gian.

    Cu 13: Vi T l chu k bn r, l hng s phng x ca mt cht phng x. Coi 2ln = 0,693, mi

    lin h gia T v l

    A.

    2ln=T . B.

    2

    ln=T . C.

    693,0

    =T . D. 2lnT= .

    Cu 14: Cng dng in chy qua tin c biu thc i = 10 2 sin100t (A). Bit tin cdung khng ZC = 40 . Hiu in th gia hai bn ca tin c biu thc l

    A. u = 200 2 sin(100t +2

    ) (V). B. u = 300 2 sin(100t +2

    ) (V).

    C. u = 400 2 sin(100t -2

    ) (V). D. u = 100 2 sin(100t -2

    ) (V).

    Cu 15: Khi ni v sng chc, pht biu no sau y l sai?A. Sng chc c phng dao ng vung gc vi phng truyn sng l sng ngang.B. Sng chc l s lan truyn dao ng chc trong mi trng vt cht.C. Sng chc truyn c trong tt c cc mi trng rn, lng, kh v chn khng.D. Sng m truyn trong khng kh l sng dc.

    Cu 16: Mt my bin th (my bin p) c hiu sut xp x bng 100%, c s vng dy cun scpln hn 10 ln s vng dy cun th cp. My bin th ny

    A. c cng sut cun th cp bng 10 ln cng sut cun scp.B. c cng sut cun scp bng 10 ln cng sut cun th cp.C. l my h th (ci h p).D. l my tng th (ci tng p).

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    Cu 17: Mt cun dy thun cm (cm thun) c t cm L mc ni tip vi mt tin c indung C thnh mt mch dao ng (cn gi l mch dao ng LC). Bit L = 2.10-2 H v C = 2.10-10 F.Chu k dao ng in t t do trong mch dao ng l

    A. 4 s. B. 4.10-6 s. C. 2 s. D. 2.10-6 s.

    Cu 18: Chiu ti b mt ca mt kim loi bc x c bc sng , gii hn quang in ca kim loi l 0.Bit hng s Plng l h , vn tc nh sng trong chn khng l c . c hin tng quangin xy ra th

    A. >0. B. 2 >3. B. 2 > 3 >1. C. 2 > 1 >3. D. 3 > 1 >2.Cu 31: Mt con lc l xo gm mt l xo khi lng khng ng k, mt u cnh v mt ugn vi mt vin bi nh. Con lc ny ang dao ng iu ha theo phng nm ngang. Lc n hica l xo tc dng ln vin bi lun hng

    A. theo chiu dng quy c. B. theo chiu m quy c.C. theo chiu chuyn ng ca vin bi. D. v v tr cn bng ca vin bi.

    Cu 32: ln in tch nguyn t l e = 1,6.10-19 C, in tch ca ht nhn B105 l

    A. 5e. B. 10e. C. - 10e. D. - 5e._________________________________________________________________________________PHN RING (Th sinh hc theo ban no phi lm phn thi ring ca ban ).Phn dnh cho th sinh ban Khoa hc Tnhin (8 cu, tcu 33 n cu 40).

    Cu 33: Mt mch dao ng in t gm tin c in dung2

    4

    =C .10-12 F v cun dy cm

    thun (thun cm) c t cm L = 2,5.10-3 H. Tn s dao ng in t t do ca mch lA. 2,5.105 Hz. B. 0,5.105 Hz. C. 0,5.107 Hz. D. 5.105 Hz.

    Cu 34: Mt vt rn ang quay nhanh dn u quanh mt trc cnh xuyn qua vt. Mt im trn

    vt rn khng nm trn trc quay cA. gia tc tip tuyn hng vo tm quo.B. gia tc tip tuyn tng dn, gia tc hng tm gim dn.C. ln ca gia tc tip tuyn lun ln hn ln ca gia tc hng tm.

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    D. gia tc tip tuyn cng chiu vi chiu quay ca vt rn mi thi im.Cu 35: Mt bnh xe bt u quay nhanh dn u quanh mt trc cnh ca n. Sau 10 s k t lc

    bt u quay, vn tc gc bng 20 rad/s. Vn tc gc ca bnh xe sau 15 s k t lc bt u quaybng

    A. 15 rad/s. B. 20 rad/s. C. 30 rad/s. D. 10 rad/s.Cu 36: Trong quang ph vch pht x ca nguyn t hir (H), dy Banme c

    A. tt c cc vch u nm trong vng hng ngoi.

    B.bn vch thuc vng nh sng nhn thy l H,H,H,H, cc vch cn li thuc vng hngngoi.

    C. tt c cc vch u nm trong vng t ngoi.D.bn vch thuc vng nh sng nhn thy l H,H,H,H, cc vch cn li thuc vng t ngoi.

    Cu 37: Trong dao ng chc, khi ni v vt dao ng cng bc (giai on n nh), pht biuno sau y l ng?

    A. Bin ca dao ng cng bc lun bng bin ca ngoi lc tun hon tc dng ln vt.B. Chu k ca dao ng cng bc lun bng chu k dao ng ring ca vt.C. Bin ca dao ng cng bc ch ph thuc vo tn s ca ngoi lc tun hon tc dng ln

    vt.

    D. Chu k ca dao ng cng bc bng chu k ca ngoi lc tun hon tc dng ln vt.Cu 38: Mt vt rn quay chm dn u quanh mt trc cnh xuyn qua vt. Ti mt im xcnh trn vt cch trc quay mt khong r 0 th i lng no sau y khng ph thuc r?

    A. Vn tc di. B. Vn tc gc. C. Gia tc tip tuyn. D. Gia tc hng tm.

    Cu 39: Mt vt rn ang quay quanh mt trc cnh (). Khi tng momen ca cc ngoi lc tcdng ln vt i vi trc () bng 0 th vt rn s

    A. quay chm dn ri dng li. B. quay u.C. quay nhanh dn u. D. quay chm dn u.

    Cu 40:n v ca gia tc gc lA. kg.m/s. B. rad/s2. C. kg.rad/s2. D. rad/s.

    _________________________________________________________________________________Phn dnh cho th sinh ban Khoa hc X hi v Nhn vn (8 cu, tcu 41 n cu 48).

    Cu 41: Ht nhn Na2411 cA. 11 prtn v 24 ntron. B. 13 prtn v 11 ntron.C. 24 prtn v 11 ntron. D. 11 prtn v 13 ntron.

    Cu 42: Ntron l ht scpA. khng mang in. B. mang in tch m.C. c tn gi khc l ht ntrin. D. mangin tch dng.

    Cu 43: Nu quan nim nh sng ch c tnh cht sng th khng th gii thch c hin tng no

    di y?A. Khc x nh sng. B. Giao thoa nh sng.C. Phn x nh sng. D. Quang in.

    Cu 44: Khi ni vin t trng, pht biu no sau y l sai?A. ng sc in trng ca in trng xoy ging nhng sc in trng do mt in

    tch khng i, ng yn gy ra.B. ng cm ng t ca t trng xoy l cc ng cong kn bao quanh cc ng sc in

    trng.C. Mt t trng bin thin theo thi gian sinh ra mt in trng xoy (bin thin theo thi gian).D. Mt in trng bin thin theo thi gian sinh ra mt t trng xoy (bin thin theo thi gian).

    Cu 45: Mt my pht sng pht ra sng cc ngn c bc sng = 103 m, vn tc nh sng trong

    chn khng bng 3.108 m/s. Sng cc ngn c tn s bngA. 90 MHz. B. 60 MHz. C. 100 MHz. D. 80 MHz.

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    Cu 46: Trong cc gi thit sau y, gi thit no khngng v cc ht quac (quark)?A. Mi ht quac u c in tch l phn s ca in tch nguyn t.B. Mi ht quac u c in tch l bi s nguyn ca in tch nguyn t.C. C 6 ht quac cng vi 6 i quac (phn quac) tng ng.D. Mi harn u to bi mt s ht quac.

    Cu 47: Gi sban u c Z prtn v N ntron ng yn, cha lin kt vi nhau, c khi lngtng cng l m0, khi chng kt hp li vi nhau th to thnh mt ht nhn c khi lng m. Gi c l

    vn tc nh sng trong chn khng. Nng lng lin kt ca ht nhn ny c xc nh bi biuthc

    A. E = (m0 - m).c2. B. E = m0.c

    2. C. E = m.c2. D. E = (m0 - m).c.

    Cu 48: S phn hch ca ht nhn urani ( U23592 ) khi h p th mt ntron chm xy ra theo nhiu

    cch. Mt trong cc cch c cho bi phng trnh nkSrXeUn 109438

    14054

    23592

    10 +++ . S ntron

    c to ra trong phn ng ny lA. k =3. B. k = 6. C. k = 4. D. k =2.

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