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Trng THPT Dn LpNguyn Minh

THI TH I HC LN 3Thi gian lm bi:90 pht

M thi 134

H, tn th sinh:.....................................................................Cu 1: Khi t mt in p xoay chiu vo hai u on mch gm in tr thun R = 50 mc ni tip

vi mt t in C th biu thc dng in c dng 1 2 cos(100 )6

i t A

= + . Mc ni tip thm vo mch

in mt cun dy thun cm L , ri mc vo in p xoay chiu trn th dng in c biu thc

22 cos(100 )

2i t A

= . Biu thc in p hai u on mch l

A. 100 os(100 t- )6

u c V

= B. 100 os(100 t- )3

u c V

=

C. 200 os(100 t- )6

u c V

= D. 200 os(100 t- )3

u c V

=

Cu 2: Mt vt dao ng iu ha vi bin 5 cm v tn s f = 3 Hz. Xc nh vn tc trung bnh saumt chu k dao ng.

A. 30 cm/s B. 15 cm/s C. 60 cm/s D. 0Cu 3: C ba ngun m c tn s 20 Hz, 40 Hz v 60 Hz khi tng hp chng li thnh mt ngun m thc tn s

A. 20 Hz B. 60 Hz C. 120 Hz D. 40 Hz

Cu 4: Mt khe hp pht ra nh sng trng chiu sng hai khe I-ng cch nhau 1,2 mm. Mn quan stcch mt phng hai khe l 2m. Bit rng nh sng nhn thy c bc sng t 380 nm n 760 nm. Xcnh s bc x cho vn sng ti im cch vn trung tm 4 mm?

A. 2 B. 3 C. 4 D. 5

Cu 5: Trong hin tng giao thoa sng c vi hai ngun kt hp cch nhau 12 cm, dao ng cng phav cng tn s f = 20 Hz. Bit tc truyn sng l 0,6 m/s. Trn ng trung trc ca hai ngun imc im M cch trung im I ca on thng ni hai ngun l 10 cm. Xc nh s im dao ng cng

pha vi hai ngun trn on MI ?A. 4 B. 6 C. 2 D. 3

Cu 6: Trong quang ph ca Hidro, khi electron chuyn t qu o L v K s pht ra photon c bc

sng 0. Bit nng lng ca nguyn t hidro c biu thc 02 ( 1;2....)nE

E nn

= = . Bc sng ca tia mu

lam trong dy Banme lA. 5,4 0 B. 4 0 C. 4,5 0 D. 6 0

Cu 7: Mt sng dng trn mt si dy c u B c nh v ngun sng c phng trnh

2cos(20 )

3

u t cm

= + . Bit tc truyn sng trn dy bng 3 m/s. Gi M l mt im trn dy cch B

mt on l d dao ng vi bin bng 2 cm. Gi tr nh nht ca d lA. 15 cm B. 5 cm C. 2,5 cm D. 12,5 cm

Cu 8: Mt vt dao ng iu ha vi bin l 6 cm. Bit rng thi gian ngn nht vt i t v tr cnbng n v tr c ng nng bng 3 ln th nng l 0,1 s. Tc trung bnh ln nht ca vt trong thigian 0,8 s l

A. 37,5 cm/s B. 45 cm/s C. 22,5 cm/s D. 60 cm/s

Cu 9: t in p xoay chiu c gi tr hiu dng v tn s khng i vo hai u on mch gm bintr R mc ni tip vi cun cm thun c t cm L. Gi in p hiu dng gia hai u tu in, giahai u bin tr v h s cng sut ca on mch khi bin tr c gi tr R1 ln lt l UL1, UR1 v cos 1;khi bin tr c gi tr R2 th cc gi tr tng ng ni trn l UL2, UR2 v cos 2. Bit UL1 = 3UL2, UR2 =3UR1. Gi tr ca cos 1 v cos 2 l:

A. 1 21 3

cos ,cos2 5 2 5

= = . B. 1 21 3

cos , cos15 15

= = .

Trang 1/7 - M thi 134


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C. 1 21 3

cos , cos10 10

= = . D. 1 21 3

cos , cos2 7 2 7

= = .

Cu 10: Trong mt mch dao ng in t l tng LC, in p cc i gia hai bn t in v cng dng in cc i trong mch ln lt l 12 V v 0,05A . Ti thi im cng dng in trong mchc gi tr bng 0,025A th in p gia hai bn t c ln l

A. 6 3 V. B. 9 V. C. 3 3 V. D. 6 V.

Cu 11: Pht biu no sau y lsai khi ni v nng lng dao ng in t t do (dao ng ring) trong

mch dao ng in t LC khng in tr thun?A.Nng lng t trng cc i bng nng lng in t ca mch dao ng.B.Nng lng in trng v nng lng t trng bin thin iu ha vi tn s bng mt na tn s

ca cng dng in trong mch.C.Nng lng in t ca mch dao ng bng tng nng lng in trng tp trung t in v

nng lng t trng tp trung cun cm.D. Khi nng lng in trng gim th nng lng t trng tng.

Cu 12: Mt on mch xoay chiu gm in tr thun R, cun cm thun L v t in C mc ni tip.t vo hai u on mch mt in p xoay chiu c gi tr hiu dng bng 120 2 V v tn s thay ic. Khi tn s c gi tr f = 50 Hz th cng dng in trong mch c gi tr hiu dng bng 1 A v

sm pha hn in p hai u on mch l4 rad. Khi tn s c gi tr f = 100 Hz th cng dng in

trong mch cng pha vi in p hai u on mch. Gi tr t cm ca cun dy l

A.0, 4

H

B.0,8

H

C.1, 2

H

D.1, 6

H

Cu 13: Mt vt thc hin ng thi hai dao ng iu ha 1 1 os tx A c = ; 2 2, 5 3 os( t+ )x c cm = v c

bin dao ng tng hp l 2,5 cm. A1 t gi tr cc i th gi tr ca l:

A. . B.2

3rad

C.

6rad

D.

5

6rad

Cu 14: Khi chiu ln lt hai bc x in t c bc sng 1 v 2 = 2 1 vo mt tm kim loi th ts gia ng nng ban u cc i ca cc quang electron bt ra khi kim loi l 9. Gii hn quang inca kim loi l 0. Mi quan h gia bc sng 1 v gii hn quang in 0 l

A. 1 03

5 = B. 1 0

5

7 = C. 1 0

5

16 = D. 1 0

7

16 =

Cu 15: Lc ko v tc dng ln mt cht im dao ng iu ha c lnA. t l vi bnh phng bin .B. t l vi ln ca li v lun hng v v tr cn bng.C. khng i nhng hng thay i.D. t l vi ln ca li v hng khng i.

Cu 16: Mt sng ngang truyn dc theo mt trc ta Ox theo phng trnh x. os2 (f- )u a c = ( trong

x, u c o bng cm v t o bng s). Tc dao ng cc i ca cc phn t mi trng gp 4 lntc truyn sng nu :

A.4

a = B. 2 a = C. a = D.

2

a =

Cu 17: Mt nh my pht in gm c 4 t my c cng cng sut hot ng ng thi. in sn sut rac a ln ng dy v truyn ti ni tiu th vi hiu sut truyn ti l 80%. Hi khi ch cn mt tmy hot ng bnh thng th hiu sut truyn ti ti ni tiu th bng bao nhiu ? Coi in p a lntruyn ti, h s cng sut truyn ti v in tr dy khng i.

A. 80% B. 75% C. 20% D. 95%Cu 18: Mt ngun m ng hng pht ra t O. Gi A v B l hai im trn cng mt phng truynm v cng pha so vi O. Mc cng m ti A l 50 dB, ti B l 30 dB. Tnh mc cng m titrung im ca AB?

A. 40 dB B. 34,6 dB C. 35,2 dB D. 37,2 dBTrang 2/7 - M thi 134


3/7

Cu 19: Mt cht im dao ng iu ha c khong thi gian gia hai ln lin tip vt qua v tr cnbng l 0,5 s v qung ng vt i c trong 2 s l 32 cm. Ti thi im t = 1,5 s vt qua v tr c li x = 2 3 cm theo chiu dng. Phng trnh dao ng ca cht im l

A. 8cos( )3

x t cm

= B. 8cos( )6

x t cm

= +

C. 4 cos(2 )6

x t cm

= D.5

4cos(2 )6

x t cm

= +

Cu 20: Mt on mch xoay chiu gm in tr thun R, cun cm thun L v t in C mc ni tip.Tn s gc ring ca mch l 0 , in tr R c th thay i c. Hi cn phi t vo mch mt in pxoay chiu c gi tr hiu dng khng i, tn s gc bng bao nhiu in p hiu dng URL khng phthuc vo R?

A. 02 = B.0

2

= C. 0 2 = D. 0 =

Cu 21: Trong th nghim I-ng v giao thoa nh sng , khong cch gia hai khe bng 1,5 mm, khongcch t hai khe ti mn l 1,5m v ngun sng pht ra hai bc x c bc sng 1 = 480 nm v 2 = 640nm. Bit b rng ca trng giao thoa l 2 cm. Xc nh s vn sng cng mu vi bc x 1 trn mnquan st?

A. 72 B. 28 C. 30 D. 41Cu 22: t mt hiu in th xoay chiu c gi tr hiu dng khng i vo hai u on mch RLCkhng phn nhnh. Hiu in th gia hai u

A. cun dy lun vung pha vi hiu in th gia hai u t in.B. cun dy lun ngc pha vi hiu in th gia hai u t in.C. on mch lun cng pha vi dng in trong mch.D. t in lun cng pha vi dng in trong mch.

Cu 23: Trong s ca mt my pht sng v tuyn in, khng c mch (tng)A.pht dao ng cao tn B. khuch iC.bin iu D. tch sng

Cu 24: Ngi ta a mt con lc n t mt t ln mt ni c cao 5 km. Coi nhit khng thayi v bn knh tri t bng 6400 km. chu k dao ng con lc khng thay i th phi tng hay gimchiu di con lc bao nhiu phn trm?

A. 0,16% B. 0,45% C. 0,32% D. 0,57%

Cu 25: Mt my pht in xoay chiu mt pha m phn cm gm 4 cp cc, phn ng gm 3 cp cun

dy mc ni tip, mi cun c 50 vng dy. Bit rng t thng cc i qua mt vng dy l10

Wbm

.

Cho rto quay vi tc 900 vng/pht th sut in ng hiu dng do my pht to ra lA. 180 2 V B. 30 2 V C. 90 2 V D. 60 2 V

Cu 26: iu no sau y l ng khi ni v c nng ca mt vt dao ng iu ha?

A. Bng ng nng ca vt khi ti v tr cn bng.B. Bin thin tun hon theo thi gian vi chu k bng mt na chu k dao ng.C. Tng gp i khi bin ca vt tng gp i.D. Bin thin tun hon theo thi gian vi chu k bng vi chu k dao ng ca vt.

Cu 27: Mt n ng c mc vo mt mng in xoay chiu c tn s f = 50 Hz v in p hiu dngU = 220 V. Bit rng n ch sng khi in p gia hai cc ca n c ln khng nh hn 155,6 V.Trong mt chu k thi gian n sng l

A.3

100s B.

1

20s C.

1

100s D.

1

75s

Cu 28: Hy chn pht biusai?

A. Dng in xoay chiu ba pha to ra t trng quay c tn s nh hn tn s ca dng inB.Nguyn tc hot ng ca ng c khng ng b da trn hin tng cm ng in t v s dngt trng quay.

C. Trong ng c khng ng b tc quay ca rto lun nh hn tc quay ca t trng.



4/7

D. T ng c khng ng b ba pha c th bin i thnh my pht in xoay chiu ba pha.

Cu 29: Hai ngun sng kt hp S1 ; S2 dao ng cng pha v cch nhau 10 cm. V mt pha ca S1S2 lythm hai im S3S4 = 4 cm v hp thnh mt hnh thang cn S1S2S3S4. Bit bc sng trn mt nc l = 1 cm. Hi ng cao ln nht l bao nhiu trn on S3S4 c 5 im dao ng vi bin cc i

A. 6 2 cm B. 4 cm C. 3 2 cm D. 2 2 cm

Cu 30: Mt toa xe trt khng ma st trn mt ng dc xung di, gc nghin ca dc so vi mtphng nm ngang l 300. Treo ln trn xe mt con lc n gm mt dy treo chiu di l = 1 m. Trong thigian xe trt xung kch thch cho con lc dao dng iu ha. B qua mi ma st, ly g = 10 m/s 2. Chu kdao ng ca con lc l

A. 1,849 s. B. 1,721 s. C. 2,294 s. D. 2,135 s.

Cu 31: Sng in t l qu trnh lan truyn ca in t trng bin thin, trong khng gian. Khi ni vquan h gia in trng v t trng ca in t trng trn th kt lun no sau y l ng?

A. Vct cng in trng v cm ng t cng phng v cng ln.B. Ti mi im ca khng gian, in trng v t trng lun lun dao ng ngc pha.C. Ti mi im ca khng gian, in trng v t trng lun lun dao ng lch pha nhau /2.D. in trng v t trng bin thin theo thi gian vi cng chu k.

Cu 32: Mt on mch xoay chiu AB ni tip mc theo th t : on AM cha cun cm thun, onMN cha in tr thun, on NB cha t in. t vo hai u AB mt in p xoay chiu n nh th

o c UAN = 200 V, UMB = 150 V v ng thi uAN lch pha /2 so vi uMB. Bit rng dng in trongmch c biu thc 2cos(100 )( )i t A= . Cng sut tiu th ca on mch l

A. 120 W B. 120 2 W C. 100 W D. 240 W

Cu 33: Dng in trong mch LC l tng c dng 0 os(2000 t)Ai I c = . Thi gian ngn nht kt t thiim t = 0, dng in c ln bng gi tr hiu dng v ang tng l

A.35.10

8s

B.310

8s

C.33.10

8s

D.310

4s

Cu 34: Tia hng ngoi l mt bc x c bn cht l sng in t c kh nngA. Ion ha khng kh mnh. B. m xuyn mnh.

C. Kch thch mt s cht pht quang. D. giao thoa v nhiu x.Cu 35: Mt vt dao ng iu ha vi phng trnh cosx A t= . Hy xc nh t s gia tc trung

bnh v ln vn tc trung bnh khi vt dao ng c3

4chu k u tin.

A. 2 B. 3 C. v cng ln D. 1

Cu 36: Chiu nh sng trng i qua lng knh c gc chit quang bng 30 0 th thy nh sng tm c gclch cc tiu. Bit chit sut ca lng knh i vi tia tm v tia ln lt l 1,58 v 1,54. Xc nh gclch ca tia khi tia tm c gc lch cc tiu?

A. 16058 B. 16,580. C. 1506 D. 15,60

Cu 37: Bit khi lng ca prtn; ntron; ht nhn 168 O ln lt l 1,0073 u; 1,0087 u; 15,9904 u v 1u

= 931,5 MeV/c2. Nng lng lin kt ca ht nhn 168 O xp x bngA. 14,25 MeV. B. 18,76 MeV. C. 128,17 MeV. D. 190,81 MeV.

Cu 38: Ti im M trn mn c vn sng bc 10. Dch mn i so vi v tr c 10 cm th ti M c vn tith 10 k t vn sng trung tm. Khong cch t mt phng hai khe n mn trc khi dch chuyn l

A. 1,2 m B. 1,9 m C. 1,5 m D. 1 m

Cu 39: Bit cng thot electron ca Litium l 2,39 eV. Bc x in t no c thnh phn in trngbin thin theo quy lut di y s gy ra c hin tng quang in? Cho hng s Plng h = 6,625.10-34Js.

A. 140 os(10 .10 )E E c t= B.14

0os(9 .10 )E E c t=

C.14

0 os(5 .10 )E E c t= D.15

0 os(2 .10 )E E c t=

Cu 40: Trong th nghim I-ng v giao thoa nh sng. Ngun sng c chiu ng thi ba bc x cbc sng ln lt 1 = 480 nm, 2 = 540 nm v 3 = 720 nm. Ba bc x trn cho vn trng gn vntrung tm nht ti vn sng bc my ca bc x 2?



5/7

A. 27 B. 12 C. 8 D. 18

Cu 41: Mt vt dao ng tt dn c cc i lng gim lin tc theo thi gian lA.bin v gia tc B.bin v tc C.bin v nng lng D. li v tc

Cu 42: Khi ni v photon, pht biu no sau y lsai?A. Photon lun chuyn ng vi tc rt ln trong khng kh.B. ng lng ca photon lun bng 0.C. Mi photon c nng lng xc nh.

D. Tc ca cc photon trong chn khng l khng i.Cu 43: Ngi ta truyn ti in nng t A n B. A dng mt my tng th v B dng mt my hth, dy dn t A n B c in tr 40 . Cng dng in hiu dng chy trn dy dn l 50A .Cng sut hao ph trn ng dy bng 5% cng sut tiu th B v in p hiu dng hai u cun thcp ca my h th l 200 V. Bit dng in lun cng pha vi in p v b qua mi hao ph qua my

bin p. T s bin i in p ca my h th lA. 0,05 B. 0,004 C. 0,01 D. 0,005

Cu 44: Pht biu no sau y l sai khi ni v hin tng phng x?A. Trong phng x +, ht nhn m v ht nhn con c s khi bng nhau, s ntron khc nhau.B. Trong phng x , c s bo ton in tch nn s prtn c bo ton.

C. Trong phng x , ht nhn con c s ntron nh hn s ntron ca ht nhn m.D. Trong phng x -, ht nhn m v ht nhn con c s khi bng nhau, s prtn khc nhau.

Cu 45: Mt dung dch hp th nh sng c bc sng 485 nm v pht ra nh sng c bc sng 530 nm.Ngi ta gi hiu sut ca s pht quang l t s gia nng lng nh sng pht quang v nng lng nhsng hp th. Bit hiu sut ca s pht quang ca dung dch trn l 80%. S phn trm s photon b hpth dn n s pht quang ca dung dch l

A. 87,4% B. 79,6% C. 75% D. 66,8%

Cu 46: Ti thi im t0, t s gia lng cht cn li vi lng cht phng x l1

7. Bit chu k bn

r ca cht trn l 12 nm. Hi sau bao lu th t s trn l

1

31 ?A. 20 nm B. 27,3 nm C. 36 nm D. 24 nm

Cu 47: Mt vt c khi lng ngh m0, khi chuyn ng vi tc v = 0,8c( vi c l tc nh sngtrong chn khng th ng nng ca vt bng bao nhiu?

A. 0,32m0c2. B.8

15m0.c2. C.

2

3m0.c2. D. 0,8m0.c2.

Cu 48: Cng sut ca on mch xoay chiu trn on mch RLC mc ni tip khng ph thuc voA. t s gia in tr thun v tng tr ca mch.B. cng dng in hiu dng qua mch.C. in p hiu dng hai u on mch.

D. lch pha gia dng in v in p gia hai bn t.Cu 49: Ti thi im t = 0 u O ca mt si dy cao su di, c cng thng nm ngang bt u daong i ln vi bin bng 1,5 cm, chu k T = 2 s. Hai im gn nht trn dy dao ng cng pha l 6cm. Tnh thi im ln u tin im M cch O 4 cm ln ti im cao nht.

A.1

2s B.

11

6s C.

7

3s D.

4

3s

Cu 50: Mt mch dao ng gm t in c in dung C = 40 nF v cun cm c t cm L = 2 H ,in tr thun r = 0,02 . Np cho t in mt in tch ban u Q0 = 2 C . duy tr dao ng camch th phi cung cp cho mch cng sut l

A. 0,5 W B. 1 W C. 2 W D. 4 W

-----------------------------------------------

----------- HT ----------



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made cauhoi dapan 134 26A



7/7

134 1C 134 27D134 2D 134 28A134 3A 134 29A134 4B 134 30D134 5C 134 31D134 6B 134 32B134 7C 134 33A

134 8C 134 34D134 9C 134 35B134 10A 134 36A134 11B 134 37C134 12A 134 38B134 13D 134 39D134 14D 134 40C134 15B 134 41C134 16D 134 42B134 17D 134 43D134 18C 134 44B134 19D 134 45A134 20B 134 46D134 21C 134 47C134 22B 134 48D134 23D 134 49B134 24A 134 50A134 25A


mon-2012-2013nguyEn-minh-3134.thuvienvatly.com.15167.31966

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