C Giu nguyen tan sd cua anh sang kch thich va kim loai lam catet, tang cuang do chum sang kich thich thi dong nang ban cuc dai cua electron quang dien tang. Giu nguyen cuang do chum s[r]
Trang 1TRAC NGHIEM LY THUYET
TOAN BQ C HI (AG TRINH VAT LY 12 CHUONG I.
DAO DQNG CO HOC
i i
Cau 1 Dao dong ca hoc la
1. chuyen dong tuan hoan quanh mot vi trl can bang
D chuyen dong thang bien ddi quanh mot vi trl can bang
Cau 2 Trong dao dong dieu hoa, phat bieu nao sau day la
khdng dung
dau
ga tri ban dau
ga tri ban dau
D Cu sau mot khoang thai gian T thi bien do vat lai trd ve gia
tri ban dau
Cau 3 Trong dao dong dieu hoa cua chat diem, chat diem doi
chieu chuyen dong khi
C luc tac dung co do ldn cuc dai
D luc tac dung co do ldn cuc tieu
Cau 4 Van tec cua vat dao dong dieu hoa co do ldn cuc dai khi
11.vat d vi trl co li do bang khdng
dai Cau 5 Dao dong dieu hoa la:
lap lai nhu cu sau nhung khoang thai gian bang nhau
khdng doi
15. hinh chieu cua chuyen dong trdn deu len mot during
thang nam trong mat phang quy dao
Cau 6 Phat bieu nao sau day sai khi noi ve dao dong dieu hoa:
D dao dong dieu hoa cri quy dao la during hinh sin Cau 7 Mot
vat dang dao dong dieu hoa, khi vat chuyen dong tu vi trl bien ve
vi trl can bang thi:
22.gia tec cung hudng vdi chuyen dong
Cau 8 Phat bieu nao sau day ve su so sanh li do, van tec va gia
tec la dung Trong dao dong dieu hoa, li do, van tec va gia tec la
ba dai luong bien doi dieu hoa theo thai gian va cri
C cung tan sd goc D cung pha ban dau
Cau 9 Khi nrii ve mot vat dao dong dieu hda co bien do A va chu
ki T, vdi mec thai gian (t = 0) la luc vat d vi trl bien, phat bieu naosau day la sai
Goi v va a lan luot la van tec va gia tec cua vat He thuc dung la
2
2 2
• A^=ACau 11 Luc keo ve tac dung len mot chat diem dao
dong dieu hda ci do ldn
27.ti le vdi do ldn cua li do va ludn hudng ve vi trl can bang
D.vm i n =- Cau 14 Mot vat dao dong dieu hda, khi vat di qua vi trl
can bang thi:
31.do ldn van tec cuc dai, gia tec bang khdng
Cau 15 Chon phat bieu sai ve quan he giua chuyen dong trdn deu
va dao dong dieu hoa la hinh chieu cua no
Trang 239. Gia tec cua vat dat gia tri cuc dai khi
vat chuyen dong qua vi trl can bang
vat d mot trong hai vi trl bien
vat chuyen dong qua vi trl can bang
Cau 17 Gia tec cua vat dao dong dieu hoa bang
khdng khi
C vat d vi trl co li do bang khdng D vat d vi trl
co pha dao dong cuc dai Cau 18 Trong dao
dong dieu hoa A gia tec bien doi dieu hoa cung
pha so vdi li do
nguoc pha so vdi li do D gia tec bien doi
dieu hoa cham pha n/2 so vdi li do
Cau 19 Dong nang trong dao dong dieu hoa
bien doi theo thai
dieu hoa vdi chu ky —
Cau 20 Tim dap an sai Ca nang cua dao dong
dieu hoa bang A Tong dong nang va the
nang vao thai diem bat ky
46. Dong nang vao thai diem ban
dau
Cau 21 Phat bieu nao sau day ve dong nang va
the nang trong dao dong dieu hoa la khdng
dung
doi dieu hoa cung chu ky
50. Dong nang bien doi dieu hoa
cung chu ky vdi van tec
vdi tan se gap 2 lan tan se cua
li do
vao thai gian
Cau 22 Phat bieu nao sau day ve dong nang va
the nang trong dao dong dieu hoa la khdngdung
chuyen dong qua vi tri can bang
mot trong hai vi trl bien
cua vat dat gia tri cuc tieu
D The nang dat gia tri cuc tieu khi gia tec cuavat dat gia tri cuc tieu
Cau 23 Ca nang cua mot vat dao dong dieu hda
A bien thien tuan hoan theo thai gian vdi chu
ky bang mot nua chu ky dao dong cua vat
dong cua vat tang gap ddi
57. bang dong nang cua vat khi vat tdd vi trl can bang
chu ky bang chu ky dao dong cua vat
Cau 24 Khi nrii ve nang luong cua mot vat dao
dong dieu hda, phat bieu nao sau day la dung
A Cu moi chu ki dao dong cua vat, co benthai diem the nang bang dong nang
khi vat d vi trl can bang
dai khi vat d vi trl bien
thien cung tan se vdi tan se cua li do
Cau 25 Mot vat dao dong dieu hda theo mot
truc ce cfinh (mec the nang d vi trl can bang) thi
cua vat co do ldn cuc dai
tec va gia tec cua vat ludn cung dau
C khi d vi trl can bang, the nang cua vat bang ca nang
D the nang cua vat cuc dai khi vat d vi trl bien
Cau 26 Dieu nao sau day sai ve gia tec cua dao
dong dieu hoa:
A bien thien cung tan se vdi li do x
64. luon luon cung chieu vdi chuyen dong
dung bang khdng
Trang 3Cau 27 Con lac ld xo ngang dao dong dieu hoa,
van tec cua vat bang khdng khi vat chuyen dongqua A vi trl can bang
B vi trl ma luc dan hoi cua ld xo bang khdng
C vi trl vat co li do cuc dai
D vi trl ma ld xo khong bi bien dang Cau
28 Trong dao dong dieu hoa cua con lac ld xo,
phat bieu nao sau day la khdng dung
A Luc keo ve phu thuoc vao do cung cua ld xo
67. Luc keo ve phu thuoc vao khei luong cua vat nang
khei luong cua vat
luong cua vat Cau 29 Con lac ld xo dang dao
dong dieu hoa, van tec cua vat bang khdng khi vat di qua :
A vi trl ma ld xo cri chieu dai ldn nhat
Cau 30 Dao dong dieu hoa cua con lac ld xo
nam ngang Chon phat bieu sai:
hudng ve vi trl can bang
cung cua ld xo
dong tuan hoan
dong dieu hoa
C thai gian thuc hen mot dao dong cang ldnkhi bien do cang ldn
D se dao dong thuc hen duoc trong mot gay
can bac hai cua do cung k
Trang 4Cau 32 Mot con lac ld xo dao dong dieu hoa
tren mat phang ngang Chon phat bieu dung:
luong m cua vat nang
79. luc dan hoi ludn nguoc chieu vdi li do
Cau 33 Con lac ld xo treo thang dung co do
khi d vi trl can bang, g la gia tec trong truang
He thuc tlnh chu ki cua con lac ld xo la:
g , Cau 34 Con lac ld xo dao
dong dieu hoa, khi tang khei luong
cua vat len 4 lan thi tan se dao dong cua vat
lan
Cau 35 Chu ki dao dong cua con lac ld xo phu
thuoc vao:
Cau 36 Tan se cua con lac ld xo phu thuoc vao:
nang
do
Cau 37 Mot con lac ld xo dang dao dong dieu
hoa Bien do dao dong phu thuoc vao:
A do cung cua ld xo B khei luong vat
nang
C dieu kien klch thlch ban dau
Cau 38 Con lac dan dao dong dieu hoa, khi tang
chieu dai cua con lac len 4 lan thi tan se daodong cua con lac
lan
lan
Cau 39 Trong dao dong dieu hoa cua con lac
dan, phat bieu nao sau day la dung
cua con lac
88. Luc keo ve phu thuoc vao khei luong cua vat nang
luong cua vat
luong cua vat Cau 40 Con lac dan chieu dai
khong doi, dao dong vdi bien do nho co chu ky phu thuoc vao
A khei luong cua con lac
B trong luong cua con lac
C ti se gua khei luong va trong luong cua conlac
D khei luong rieng cua con lac Cau 41 Khi
dua mot con lac dan len cao theo phuang thang dung coi chieu dai cua con lac khdng doi thi tan
se dao dong dieu hoa cua no se
A giam vi gia tec trong truang giam theo do cao
B tang vi chu ky dao dong dieu hoa cua no giam
no ti le nghich vdi gia tec trong truang
hoa cua no khdng phu thuoc vao gia tec trongtruang
Cau 42 Phat bieu nao sau day la sai khi noi ve
dao dong cua con lac dan, bo qua luc can cuamdi truang
A Khi vat nang d vi trl bien, ca nang cua conlac bang the nang cua no
B Chuyen dong cua con lac tu vi trl bien ve
vi trl can bang la nhanh dan
C Khi vat nang di qua vi trl can bang, thitrong luc tac dung len nri can bang vdi luc cangcua day
D Vdi dao dong nho thi dao dong cua conlac la dao dong dieu hda
B T =
Trang 5Cau 43 Mot con lac dan gom soi day co khei
luong khdng dang ke, khdng dan, cri chieu dai l
va vien bi nho co khei luong m Kich thich cho
con lac dao dong dieu hoa d nai co gia tec trong
truang g Neu chon mec the nang tai vi trl can
bangcua vien bi thi the nang cua con lac nay d li
do goc a cri bieu thuc la
A mg l (1 - cosa) B mg l (1 -
sina)
cosa)
Cau 44 Chu ki dao dong dieu hoa cua con lac
dan phu thuoc vao:
treo
94.chieu dai day treo va gia tec trong
truang nai treo con lac
bien do dao dong
nai treo con lac va bien do dao dong
Cau 45 Chu ki con lac dan khdng phu thuoc
vao:
truang g
C khei luong vat nang m D vi do elia ll
Cau 46 Mot con lac dan duoc treo tai mot diem
ce dinh Keo con lac ra khoi vi trl can bang de
day treo hop vdi phuang thang dung mot goc
con lac la:
hoan C chuyen dong trdn deu D dao dong
dieu hoa
Cau 47 Mot con lac dan duoc cho dao dong vdi
bien do nho
Phat bieu nao sau day la khong dung: A toa do
cua vat nghiem dung phuang trinh:
x = Acos(rot + q>)
97. van tec cuc dai cua vat ti le nghich vdi
chieu dai cua con lac
chieu vdi li do
gia tec trong truang Cau 48 Trong dao dong
dieu hoa cua con lac dan, phat bieu nao sau day
la dung:
A luc cang day ldn nhat khi vat di qua vi trl can bang
khei luong cua qua nang
lac d vi trl bien
thuoc vao vi trl cua qua nang
Trang 6Cau 49 Mot dong ho qua lac chay dung gia tai
mot nai tren mat dat, neu ta dua dong ho len do
cao h coi nhiet do khdng doi
thi:
A dong ho chay cham B dong ho chay
nhanh
C dong ho van chay dung D khong the xac
dinh duoc Cau 50 Mot con lac dan duoc treo
vao tran cua mot xe d td dang chuyen dong theo
phuang ngang Chu ky dao dong cua con lac
khi xe chuyen dong nhanh dan deu vdi gia tec a
A T2=T3 < T1 B T2=T1=T3
T3
Cau 51 Mot con lac dan co chieu dai l, dao
dong dieu hoa tai mot nai co gia tec rai tu do g
vi trl co ly do goc a, nri cri van tec la v Khi do, ta co bieu thuc: A
Cau 52 Cho mot con lac dan co day treo cach
dien, qua cau m
tlch den q Khi dat con lac trong khdng khl thi
nri dao dong vdi
chu ki T Khi dat no vao trong mot dien truang
deu nam ngang
thi chu ki dao dong se
C tang hoac giam tuy thuoc vao chieu cua
dien truang
D giam xueng
Cau 53 Dao dong duy tri la dao dong tat dan ma
nguai ta da
vdi vat chuyen dong
theo thai gian vao dao dong
C Tac dung ngoai luc vao vat dao dong cung
chieu vdi chuyen dong trong mot phan cua tung
dung len vat
dung len vat
dung len vat Cau 55 Phat bieu nao sau day la
khdng dung
thuoc vao cach kich thlch ban dau de tao lendao dong
theo thai gian
thuoc vao phan nang luong cung cap them chodao dong trong moi chu ky
D Bien do cua dao dong cuong buc chi phuthuoc vao bien do cua luc cuong buc
Cau 56 Phat bieu nao sau day la khdng dung.
A Tan se cua dao dong cuong buc ludn bangtan se cua dao dong rieng
tan se cua luc cuong buc
khdng bang chu ky cua dao dong rieng
chu ky cua luc cuong buc
Cau 57 Phat bieu nao sau day la khdng dung.
thuoc vao cach kich thlch ban dau de tao lendao dong
giam dan theo thai gian
thuoc vao phan nang luong cung cap them chodao dong trong moi chu ky
D Bien do cua dao dong cuong buc chi phuthuoc vao bien do cua luc cuong buc
Cau 58 Nhan dinh nao sau day sai khi nrii ve
dao dong ca hoc tat dan
A Dao dong tat dan co dong nang giam dancdn the nang bien thien dieu hda
Trang 7117.Dao dong tat dan la dao dong co bien
do giam dan theo thai gian
dong tat cang nhanh
dan theo thai gian Cau 59 Khi nrii ve dao dong
cuong buc, phat bieu nao sau day la dung
ho la dao dong cuong buc
bien do cua luc cuong buc
C Dao dong cuong buc co bien do khdng doi
va cri tan se bang tan se cua luc cuong buc
D Dao dong cuong buc co tan se nho han tan
se cua luc cuong buc
Cau 60 Nhan xet nao sau day la khdng dung.
can cua mdi truang cang ldn
ky dao dong rieng cua con lac
tan se cua luc cuong buc
D Bien do cua dao dong cuong buc khdngphu thuoc vao tan se luc cuong buc
Cau 61 Nhan xet nao sau day la khdng dung.
A Dao dong tat dan cang nhanh neu luc cancua mdi truang cang ldn
ky dao dong rieng cua con lac
tan se cua luc cuong buc
D Bien do cua dao dong cuong buc khdngphu thuoc vao tan se luc cuong buc
Cau 62 Nguyen nhan gay ra dao dong tat dan
cua con lac dan dao dong trong khdng khl la
Trang 8C do luc can cua mdi truang.
D do day treo cri
khei luong dang ke Cau
63 Phat bieu nao sau
day la dung
A Trong dao dong tat dan, mot phan ca nang
da bien doi thanh nhiet nang
nang da bien doi thanh hoa nang
nang da bien doi thanh dien nang
nang da bien doi thanh quang nang
Cau 64 Phat bieu nao sau day la dung Bien do
cua dao dong cuong buc khdng phu thuoc vao
A pha ban dau cua ngoai luc tuan hoan tac dung
len vat
tac dung len vat
dung len vat
dung len vat
Cau 65 Phat bieu nao sau day la dung Hien
tuong cong hudng chi xay ra vdi
dong rieng
cuong buc Cau 66 Khi xay ra hen tuong cong
hudng ca thi vat tiep tuc dao dong
A vdi tan se bang tan se dao dong rieng
Cau 67 Khi nrii ve mot he dao dong cuong buc
d giai doan on dinh, phat bieu nao dudi day la
sai
bang tan se cua ngoai luc cuong buc
140.Tan se cua he dao dong cuong buc
ludn bang tan se dao dong rieng cua he
phu thuoc vao tan se cua ngoai luc cuong buc
phu thuoc bien do cua ngoai luc cuong buc
Cau 68 Mot vat dao dong tat dan ci cac dai
luong giam lien tuc theo thai gian la
do
C bien do va nang luong D bien do va tec do
Cau 69: Vi trl can bang
cua vat la vi trl AToa
do cua vat bang 0
143. Tong hop luc tac dung len vatbang 0
luc nao ca
vat dat cuc dai Cau 70: Chon phat bieu sai ve
dao dong tuan hoan
duoc lap lai nhu cu sau nhung khoang thai giankhdng doi
lien tiep va mai mai
C giai doan gua 2 dao dong ma trang thaidao dong lap lai dung nhu trudc la mot daodong toan phan
D thai gian de thuc hen mot dd toan phan la mot chu ki
Cau 71: Chon cau sai?
A Thai gian vat thuc hien mot dao dong toanphan goi la chu ki
148.Khoang thai gian ma trang thai daodong cua vat trd lai trang thai ban dau la motchu ki
hien trong mot dan vi thai gian
giam
Cau 72: Trong dao dong dieu hda thi van tec va
li do lech pha nhau mot goc la
Trang 9Cau 74: Trong dao dong dieu hda bien do cua
vat Chon phat bieu sai
A la gia tri cuc dai cua toa do vat
B ludn duang
dong cua vat
klch thlch ban dau Cau
75: Chon phat bieu sai?
vi trl can bang
D Khi qua vi trl can bang thi van tec vat dat
gia tri cuc dai Cau 76: Chon phat bieu dung
nhat? Hinh chieu cua mot chuyen dong trdn deu
len mot duang klnh
156. duoc xem la mot dao dong
dieu hda
dong dieu hda
Cau 77: Chon phat bieu sai? Van tec trong dao
dong dieu hda la dai luong
A bien thien dieu cung tan se cung pha vdi li
do
dai
Cau 78: Dao dong ca doi chieu khi
A luc tac dung doi chieu B luc tac dung
bang 0
C luc tac dung co do ldn cuc dai
D luc tac dung co do ldn cuc tieu
Cau 79: Chon cau dung? Gia tec trong dao dong
bang 0
Cau 80: Khi thay doi klch thlch ban dau thi dai
luong nao sau day thay doi
A tan se vabien do B phaban dauvabien do
C bien do D tan se va phaban dau
Trang 10Cau 81: Phat bieu nao sau day sai khi noi ve dao
dong dieu hda
A van tec sdm pha — so vdi li do
2
B gia tec nguoc pha vdi li do
-C van tec cham pha — so vdi li do
D gia tec vudng pha so vdi van tec Cau 82:
Vat dao dong dieu hda theo phuang trinh x =
Acos(rot + p)(A < 0) Pha ban dau cua vat la
Cau 83: Vat dao dong dieu hda theo phuang
1(cm) Vi trl can bang cua vat
Cau 84: Trong dao dong dieu hda vdi x = A
cos(rot + p) quanh vi trl can
bang Chon dap an dung?
li do cua vat
cua li do
D A la bien do, la gia tri cua x khi chat diem
d vi trl bien duang
Cau 85: Do thi bieu dien mei quan he giua li do
va van tec la mot
C duang elip D duang
Cau 87: Do thi bieu dien mei quan he giua gia
tec va van tec la
mot
Cau 89: Do thi bieu dien mei quan he giua luc
hoi phuc va giatec la mot
quan tlnh cua vat
C tong hop luc dan hoi va trong luc D trong luc
Cau 91: Trong dao dong dieu hda cua con lac ld
xo treo thangdung, luc dan hoi cua ld xo doi chieu khi A vat
d vi trl cao nhat B vat d vi trl thap nhat C
bien dang
2 - x2 = mv2 k
Cau 92: Trong dao dong dieu hda cua con lac ld
xo do cung k, khei luong vat m vdi bien do AMei lien he giua van tec va li do cua vat d thaidiem t la
Cau 93: Dei vdi con lac ld xo treo thang dung
dao dong dieu hda thi
Trang 11169.Luc dan hoi ld xo ci do ldn cuc tieu
dai luong dieu hda
Cau 94: Con lac ld xo dat tren mat phang
va do cung ld xo
xo
Cau 95: Con lac dan gan vdi Trai Dat dao dong
vdi bien do nho (bo qua luc can) la A mot dao
dong tat dan B dao dong tat dan
Cau 96: Mot vat dao dong dieu hda Truang hop
nao ci the xay ra? Khi quavi trl can bang nri cri
tec cuc tieu, gia tec
cuc dai
D van tec bang 0, gia tec cuc dai
Cau 97: Con lacdan dai l, khei luong vat m dao
dong dieu hda tai nai co gia tec trong truang g
Luc dong vai trd la luc hoi phuc cri gia tri la
B F
mgs " l
Cau 98: Luc hoi phuc cua con lac dan dao dong
dieu hda vdi bien do be la
A trong luc B luc cang day C luc quan tlnh
D tong hop giua trong luc va luc cang da
Cau 99: Chon phat bieu dung? Gia tec cua con
lac dan dao dong dieu hda
A gom gia tec tiep tuyen va gia tec phap
tuyen
vdi li do
Cau 100: Khi dat mot con lac dan trong mot
thang may So vdi khi thang may dung yen thikhi thang may chuyen dong theo phuang thangdung len tren cham dan deu co gia tec thi chu kicon lac
sml
D F = -mgls
Trang 12Cau 101: Chon phat bieu sai?
nho la mot dao dong dieu hda
gom vat nang gan vao mot dau ld xo la dao
ddng rieng
dat duoc xem la mot dao ddng rieng
D Moi dao dong tu do cua mot he dao dong
co tan se khac nhau
Cau 102: Mot con lac dan dat trong mot dien
truang deu co
cac duang suc tu theo phuang thang dung
hudng len So vdi
khi qua cau khdng tlch dien khi ta tlch dien am
cho qua cau thi
chu ki con lac se
A tang B giam
D khdng doi
Cau 103: Khi dua dong ho qua lac len cao (coi
nhiet do khdng doi) thi dong ho se
dung
cham
Cau 104: Chu ki dao dong nho cua con lac dan
trong luong con lac
luong
Cau 105: Ung dung quan trong nhat cua con lac
dan la
chieu dai con
lac C xac dinh
gia tec trong
truang
D khao sat dao dong dieu hda cua mot vat
Cau 106: Con lac dan dao dong dieu hda, neu
tang chieu dai len 4 lan, khei luong vat giam 2
lan, trong luong vat giam 4 lan Thi chu ki dao
dong be cua con lac
A tang 2V2 lan B tang 2 lan
D giam 2 lan
Cau 107: Dong nang cua vat dao dong dieu hda
vdi chu ki T bien doi theo thai gian
A vdi chu ki T/2 B vdi chu ki T
dang sin
Cau 108: Con lac ld xo treo thang dung dao
dong dieu hda Chon phat bieu sai?
cuc dai
cuc dai
C The nang cua vat day la the nang dan hoi
D The nang tai vi trl can bang la cuc tieu
Cau 109: Vat dao dong dieu hda vdi tan se goc
A Bien thien dh vdi tan se goc 2ro
o
Cau 110: Ca nang cua vat dao dong dieu hda
se goc 2ro
Cau 111: The nang cua con lac ld xo treo thang
dung
194.ca the nang trong truang va dan hoi
Cau 112: Bieu thuc ca nang cua con lac dan dai
l dao dong dieu hda tai nai co gia tec trong
C la dai luong bao toan
Trang 13C W =
Cau 113: Trong dao dong dieu hda thi dong
nang va the nang
cua vat dao dong dieu hda bien thien dieu hda
cung tan se va
pha
pha thay doi
Cau 114: Mot vat dao dong dieu hda Neu giam
chu ki 2 lan thi ca nang dao dong cua vat se
Cau 115: Phu ke noi trong mat chat long, khei
luong m, dien tich phan eng cua phu ke la S,
dao dong dieu hda trong chat long vdi tan se
goc la
p S
mg
Cau 116: Vat dao dong dieu hda vdi bien do A,
chu ki T Van tec trung binh cua vat trong mot
Cau 118: Chon phat bieu sai? Trong dao dong
cua vat chiu luc can nho khdng doi
thai gian
198.Chu ki giam dan theo thai gian
gian
Cau 119: Coi mdi truang tao nen luc can cung
thuoc ve he dao
dong thi dao dong cua vat co the coi la
A dao dong tu do B dao dong dieu hda
C dao dong duy tri D dao dong cuong
buc Cau 120: Hai con lac lam bang hai hdn bi ci
ban kinh bang nhau, treo ten hai soi day co cungchieu dai Khei luong cua hai hdn bi la khac nhau Hai con lac cung dao dong trong mot mditruang vdi cung bien do Thi con lac nao tat nhanh han?
Trang 14A Con lac nhe B Con lac
sau mot chu ki la:
A Dao dong duy tri B Dao dong cuong
buc
C dao dong dieu hda D Dao dong tat dan
Cau 122: Dao dong duy tri la dao dong tat dan
ma nguai ta da:
A Lam mat luc can cua mdi truang dei vdi
vat chuyen dong
B Tac dung ngoai luc bien doi dieu hda theo
vat chuyen dong
C Bu phan nang luong da mat mat trong mot
chu ki bang mot ca che bu nang luong
D Kich thich lai dao dong sau khi tat han
Cau 122: Chon cau tra lai dung khi noi ve dao
dong cuong buc
theo thai gian Cau 124: Bien
do cua dao dong cuong buc
A giam dan theo thai gian B bang bien do
cua ngoai luc
C ti le thuan vdi bien do cua ngoai luc
D khdng thay doi khi tan se ngoai luc tang
Cau 125: Khi tan se ngoai luc bang tan se rieng
cua he thi xay ra hien tuong:
A Bien do dao dong dat gia tri cuc dai
nhanh
dao dong bang 0
Cau 126: Chon
phat bieu sai:
tac dung cua ngoai luc tuan hoan
209.Dao dong duy tri dudi tac dung cuangoai luc co tan se rieng bang tan se rieng cuahe
ngoai luc tuan hoan he ludn dao dong vdi tan secua ngoai luc
buc khi co cong hudng deu co tan se goc bangtan se rieng cua he
Cau 127: Mot dua be dang danh du tren mot
chiec vong De cho vong dung dua nhu the mai
ti den diem cao nhat thi nguai me lai day motcai Day la dao dong gi?
Dao dong cong hudng D Dao dong cuong buc
Cau 128: Giam xoc cua dtd la ap dung cua A dao dong tat dan B dao dong tu do C dao
dong duy tri D dao dong cuong buc Cau
129: Mot dua be chai danh du, ngoi tren tam van
cua chiec du, nguai me day mot cach tuan hoan theo cung mot cach, nguai me thay bie do cua
du ngay cang tang nhanh Dayla:
A dao dong duy tri B dao dong tu do C.dao dong cuong buc
D dao dong cuong buc cong hudng Cau 130:
Bien do dao dong cuong buc khdng phu thuoc
A Pha ban dau cua ngoai luc tac dung len vat
luc can D Bien do cua ngoai luc tuan hoan
Cau 131: Dei vdi mot he dao dong thi ngoai luc
trong dao dong duy tri va dao dong cuong buc cong hudng khac nhau vi: A tan se khac nhau
B Bien do khac nhau
D Ngoai luc dao dong cuong buc doc lap vdi
he cdn dd duy tri ngoai luc duoc dieu khien bdi mot ca cau lien ket vdi he Cau 132: Khi li do
cua dao dong tong hop bang tong li do cua hai dao dong hop thanh khi hai dd hop thanh phai dao dong:
A cung phuang B cung tan se
Cau 132: Khi tong hop hai dao dong dieu hda
cung phuang cung tan se bang phuang phapgian do Frexnen, khi cac vecto bieu dien hai dao
Trang 15dong hop thanh quay vdi van tec goc o thi dai
luong thay doi la:
Cau 133: Chon cau dung Hai dao dong dieu
hda cung phuang cung tan se, co do lech pha
2
Cau 134: Hai dao dong dieu hda cung phuang
cung tan se goc ro, tai thai diem ban dau do lech
pha giua hai dd la Ap Tai thai diem t do lech ha
cua hai dao dong la
rot - A p
Cau 135: Xet hai dd cung phuang, cung tan so
Bien do dd tong hop khdng phu thuoc vao yeu
D D lech pha hai dao dong
CIU'ONGII SONG CO HOC
_i
_
Cau 136 Song ca la gi.
A Su truyen chuyen dong ca trong khdng
khl
220.Nhung dao dong ca hoc lan truyen
trong mdi truang vat chat
vat nay so vdi vat khac
mdi truang Cau 137 Sring ngang la sring:
ngang
dong theo phuang namngang
Trang 16C trong do cac phan tu song dao dong theo
phuang vudng gric vdi phuang truyen song
D trong do cac phan tu song dao dong theo
cung mot phuang vdi phuang truyen song Cau
138 Budc song la:
A quang duang song truyen di trong 1 s
song song gan nhat
co li do bang khdng d cung mot thai diem
D khoang cach giua hai diem cua song gan
nhat co cung pha dao dong
Cau 139 Mot song ca hoc co tan se f lan truyen
trong mdi truang vat chat dan hoi vdi tec do v,
khi do budc song duoc tlnh theo cong thuc
O mat nudc co hai nguon song dao dong theo
phuang vudng goc vdi mat nudc, co cung
phuang trinh u=Acos(rot) Trong mien gap
nhau cua hai song, nhung diem ma d do cac
phan tu nudc dao dong vdi bien do cuc dai se co
hieu duang di cua song tu hai nguon den do
bang A mot se le lan nua budc song
227. mot se nguyen lan budc song
song
Cau 142 Phat bieu nao sau day khdng dung vdi
song ca hoc
trong mdi truang chat ran
duoc trong mdi truang chat
long
duoc trong mdi truang chat
khi
D Song ca hoc co the lan truyen duoc trong
mdi truang chan khong
Cau 143 Phat bieu nao sau day ve song ca hoc la
khdng dung.
dong ca hoc trong mot mdi truang lien tuc
234. Sring ngang la sring cri cac
phan tu dao dong theo phuang
ngang
dong theo phuang trung vdi phuang truyensong
di duoc trong mot chu ky
Cau 144 Phat bieu nao sau day ve dai luong dac
trung cua song ca hoc la khdng dung
A Chu ky cua song chlnh bang chu ky daodong cua cac phan tu dao dong
B Tan se cua song chlnh bring tan se daodong cua cac phan tu dao dong
C Tec do cua song chlnh bang tec do daodong cua cac phan tu dao dong
D Budc song la quang duang song truyen diduoc trong mot chu ky
Cau 145 Song ca hoc lan truyen trong mdi
truang dan hoi vdi tec do v khdng doi, khi tringtan se song len 2 lan thi budc song
Cau 145 Van tec truyen song phu thuoc vao
A nang luong song B tan se dao dong
C mdi truang truyen song D budc song Cau
146 Song ca hoc lan truyen trong khdng khl vdi
cuang do du ldn, tai ta co the cam thu duoc song
ca hoc nao sau day
hoc co chu ky
hoc co chu ky 2,0ms
Cau 147 Phat bieu nao sau day khdng dung vdi
song ca hoc
trong mdi truang chat ran
duoc trong mdi truang chatlong
duoc trong mdi truang chatkhi
D Song ca hoc co the lan truyen duoc trongmdi truang chan khong
Cau 148 Mot song ca hoc co tan se f = 1000Hz
lan truyen
Trang 17trong khdng khl Song do duoc goi la
D chua du dieu ken de ket luan
Cau 149 Tec do truyen song trong mot mdi
truang
A phu thuoc vao ban chat mdi truang va bien
do song B phu thuoc vao ban chat mdi
ban chat mdi truang
Cau 150 Chon cau sai khi nrii ve su lan truyen
song co
truyen theo song
246.Phan tu vat chat lan truyen vdi tec dobang tec do truyen sing
theo song
truyen theo song Cau 151
Dieu ken co giao thoa song la
gi
nguoc chieu giao nhau
250. Cri hai sring cung tan se va
co do lech pha khdng doi
giao nhau
giao nhau Cau 152 The nao la 2 sring ket hop.
A Hai sring chuyen dong cung chieu va cung
sring cri cung tan se va co do lech pha khdng doi theo thai gian
D Hai song co cung budc song va co do lechpha bien thien tuan hoan
Cau 153 Cri hien tuong gi xay ra khi mot song
mat nudc gap mot khe chrin hep co kch thudcnho han budc song
A Sring van tiep tuc truyen thang qua khe.B.Sring gap khe phan xa trd lai
Trang 18C Sring gap khe roi dung lai.
D Sring truyen qua khe geng nhu mot tam
phat sring mdi Cau 154 Phat bieu nao sau day
la khdng dung Hien tuong giao thoa sing chi
xay ra khi hai song duoc tao ra tu hai tam song
co cac dac diem sau:
A cung tan se, cung pha B cung tan se,
nguoc pha
C cung tan se, lech pha nhau mot goc khdng
doi
D cung bien do, cung
pha Cau 155 Phat bieu
nao sau day la dung
A Hien tuong giao thoa song xay ra khi co
hai song chuyen dong nguoc chieu nhau
co hai dao dong cung chieu, cung pha gap nhau
co hai song xuat phat tu hai nguon dao dong
cung pha, cung bien do
D Hien tuong giao thoa song xay ra khi co
hai song xuat phat tu hai tam dao dong cung tan
se, cung pha Cau 156 Phat bieu nao sau day la
khdng dung.
tren mat chat long, ton tai cac diem dao dong
vdi bien do cuc dai
tren mat chat long, ton tai cac diem khdng dao
dong
tren mat chat long, cac diem khdng dao dong
tao thanh cac van cuc tieu
D Khi xay ra hien tuong giao thoa song tren
mat chat long, cac diem dao dong manh tao
thanh cac duang thang cuc dai Cau 157 Trong
hien tuong giao thoa song tren mat nudc,
khoang cach giua hai cuc dai lien tiep nam tren
duang nei hai tam sring bang bao nhieu
A bang hai lan budc song B bang mot
budc song
C bang mot nua budc song
Cau 158 De khao sat giao thoa song ca, nguai ta
be trl tren mat nudc nam ngang hai nguon ket
theo phuang thang dung, cung pha Xem bien
do song khdng thay doi trong qua trinh truyen
song Cac diem thuoc mat nudc va nam tren
nua bien do cuc dai
260.daodong vdi bien
dao dong vdibien do cuc dai
D khdng daodong
Cau 159 Dieu kien de hai sing ca khi gap nhau,
giao thoa duoc vdi nhau la hai sring phi xuatphat tu hai nguon dao dong
pha khdng doi theo thai gian
bien do
D cung tan se, cung phuang va cri hieu sepha khdng doi theo thai gian
Cau 160 Ta quan sat thay hien tuong gi khi tren
day cri sring dung
A Tat ca phan tu day deu dung yen
D Tat ca cac diem tren day deu chuyen dongvdi cung tec
do
264. Tren day cri nhung bung song xen ke vdi nut song
vdi bien do cuc dai
Cau 161 Khi cri sring dung tren soi day dan hoi
thi: A tat ca cac diem cua day deu dung dao dongB nguon phat
dao dong vdi bien do cuc dai xen
ke vdi nhung diem dung yen
sring tdi thi dung lai Cau 162 Hien tuong song
dung tren day dan hoi, khoang cach giua hai nutsong lien
A bang hai lan budc song B bang mot budc song
C bang mot nua budc song
D bang mot phan tu budc song Cau 163
Mot soi day chieu dai l cang ngang, hai dau ce dinh Tren day dang co song dung vdi n bung song, tec do truyen sing tren day la v Khoang
Trang 19thai gian giua hai lan lien tiep soi day duoi thang
la
A V B nv C -L n-L
Cau 164 Mot soi day dan hoi duoc cang ngang
giua hai diem ce dinh A va B Khi tao ra duoc
song dung tren day thi van tec truyen song tren
day duoc xac dinh theo nhung yeu te nao
AB
A Tan se song, se bung song xuat hien va
khoang cach AB
se song
do dao dong ldn nhat tren day
Cau 165 Cam gac ve am phu thuoc nhung yeu
te nao A Nguon am va mdi truang truyen
am
270. Nguon am va tai nguai nghe
nguai nghe
knh thi giac
Cau 166 Do cao cua am phu thuoc vao yeu te
nao cua am
dong cua nguon am
C Tan se cua nguon
am
D Do thi dao dong cua nguon am Cau 167
Tai con nguai co the nghe duoc nhung am co
muc cuang do am trong khoang nao
A Tu 0 dB den 1000 dB B Tu 10 dB den
100 dB
130 dB
Cau 168 Am ca ban va hoa am bac 2 do cung
mot day dan phat ra cri mei lien he vdi nhau
nhu the nao A Hoa am co cuang do ldn han
cuang do am ca ban
275. Tan se hoa am bac 2 ldn gap
ddi tan se am ca ban
tan se hoa am bac 2
hoa am bac 2 Cau 169 Trong cac nhac cu, hop
dan cri tac dung gi
A Lam tang do cao va do to cua am
Trang 20278.Tranh duoc tap am va tieng on, lam
cho tieng dan trong treo
on dinh
280.Vua khuyech dai am, vua tao ra am
sac rieng cua am do dan phat ra
Cau 170 Phat bieu nao sau day la khdng dung.
A Song am la song ca hoc co tan se nam
16Hz den 20kHz
tan se nho han 16Hz
ca song am, ha am va sieu am
Cau 170 Tec do am trong mdi truang nao sau
day la ldn nhat
Mdi truang chat ran
Cau 171 Phat bieu nao sau day la khdng dung
A Nhac am la do nhieu nhac cu phat ra
khdng xac dinh
tlnh cua am
dac tlnh cua am Cau
172 Phat bieu nao sau
day la dung
cri cam giac am do "to"
cri cam giac am do "be"
cam giac am do "to"
D Am "to" hay "nho" phu thuoc vao muc
cuang do am va tan se am
Cau 173 Nhan xet nao sau day la khdng dung.
Mot nguon am phat ra mot am co tan se khdng
doi, tan se am ma may thu, thu duoc:
chuyen dong lai gan may thu
chuyen dong ra xa may thu
dong lai gan nguon am
D khdng thay doi khi may thu va nguon amcung chuyen dong hudng lai gan nhau
Cau 174 trong truang hop nao dudi day thi am
do may thu ghi nhan duoc co tan se ldn han tan
se cua am do nguon phat ra
A Nguon am chuyen dong ra xa may thu dung yen
B May thu chuyen dong ra xa nguon am dung yen
C May thu chuyen dong lai gan nguon am dung yen
cung tec do vdi nguon am
Cau 175 Nhan xet nao sau day la khdng dung.
A Mot nguon am phat ra mot am co tan sekhdng doi, tan se am ma may thu thu duoc tanglen khi nguon am chuyen dong lai gan may thu
se khdng doi, tan se am ma may thu thu duocgiam di khi nguon am chuyen dong ra xa maythu
se khdng doi, tan se am ma may thu thu duoctang len khi may thu chuyen dong lai gan nguonam
D Mot nguon am phat ra mot am co tan se khdng doi, tan se am ma may thu, thu duoc khdng thay doi khi may thu va nguon am cung chuyen dong hudng lai gan nhau Cau 176 Khi
nguon phat am chuyen dong lai gan nguai nghe dang dung yen thi nguai nay se nghe thay mot am:
khi nguon am dung yen
vdi khi nguon am dung yen
cri tan se ldn han tan secua nguon am
Cau 177 Khi sing am truyen tu mdi truang
khdng khl vao mdi truang nudc thi A chu ki cua
no tang
301. tan se cua no khdng thay doi
Trang 21303. budc song cua no khdng thay
doi
Cau 178 Mot song ca lan truyen tren mot duang
thang tu diem O den diem M cach O mot doan
d.Biet tan se f budc song X va bien do a cua
song khdng doi trong qua trinh sring truyen
Neu phuang trinh dao dong cua phan tu vat chat
trinh dao dong cua phan tu vat chat tai O la
song am trong khdng khi nho han tec do truyen
song am trong nudc
cac mdi truang ran, long va
Cau 180: Chon nhan xet sai ve qua trinh truyen
song Qua trinh truyen song la qua trinh
mdi truang vat chat theo thai
gian
mdi truang truyen sring theo thai gian
truang truyen sring theo thai gian
D lan truyen phan tu vat chat trong mdi
truang truyen song theo thai gian
Cau 181: Nhan xet nao la dung ve song ca hoc
Trang 22D chi truyen duoc trong mdi truang vat chat,
ke ca mdi truang chan khdng
Cau 182: De phan loai song ngang va sring doc
nguai ta can cu vao
D Phuang dao dong cua cac phan tu vat chat
va phuang truyen song
Cau 183: Sring ngang la sring:
dao dong theo phuang vudng goc vdi
phuang truyen song
D ci cac phan tu song dao dong cung mot
phuang truyen song
Cau 184: Sing ngang
A Chi truyen duoc trong chat ran
320.Truyen duoc trong chat ran va be mat
chat long
va chat khl
Cau 185: Dieu nao sau day la dung khi noi ve
phuang dao dong cua song doc?
phuang thang dung
C Theo phuang
truyen song
D Vuong gric vdi phuang
truyen song Cau 186: Sing
doc
A Truyen duoc chat ran, long, khl
phuang truyen song
Cau 187: Chon phat bieu sai? Trong song ca
hoc thi
phan tu mdi truang truyen dao dong
C Phan tu d xa tam dao dong thi dao dong
nhanh pha han
D khi lan truyen thi mang theo nang luong
Cau 188: Neu luc dan hoi xuat hien khi co bien
dang nen gian thi moi truang truyen la
ngang va sring doc
C sring doc D khong phai song ca
Cau 189: Budc song X cua song ca hoc la:
A La quang duang song truyen di trong thaigian 1 chu ky sing
dong dong pha tren phuang truyen song
trong 1 s
diem vudng pha tren phuang truyen song
Cau 190: Nhan xet nao sau day la dung dei vdi
qua trinh truyen song
A Van tec truyen song khdng phu thuoc vaomdi truang truyen song
truyen di cang xa nguon
trong quatrinh truyen song
D Van tec truyen song khdng phu thuoc vaotan se cua sing
Cau 191: Chon phat bieu sai? A Chu ki va tan
se phu thuoc vao mdi truang song
trong khdng gian sing
binh phuang bien do song
chat mdi truang Cau 192: Trong hien tuong
song tren mat nudc do mot nguon sring gay ra, neu goi budc song la X, thi khoang cach giua n vdng trdn sring lien tiep nhau se la
X Cau 192: Chon cau tra lai dung Khi mot
song ca hoc truyen tu khdng khl vao nudc thi dai luong dac trung cua song khdng thay doi
A Tan se B Budc song C Van tec D
Nang luong Cau 193: Tec do truyen song ca
hoc giam dan theo thu tu cac mdi truang :
A Ran, khl va long B Khi, long va ran
C Ran, long va khi D Long, khl varan
Trang 23Cau 194: Van tec truyen song ca hoc phu thuoc
vao yeu te nao ?
song D Budc song
339. Ban chat cua mdi truang truyen song
Cau 195: Dieu nao sau day la dung khi nii ve
nang luong sring trong mot mdi truang ll tudng
nang luong khdng duoc truyen
di
341. Qua trinh truyen song la qua trinh truyen nang luong
giam ti le vdi binh phuang bien do
D Khi truyen song nang luong cua songtang ti le vdi binh phuang bien do
Cau 196: Chon phat bieu sai? Trong qua trinh
truyen song vdi chu ki T, budc song X
A Tren mot phuang truyen song den diemnao trudc thi diem do nhanh pha han
B Sring tuan hoan theo thai gian vdi chu ki T
T
C Tuan hoan theo khong gian vdi chu ki —
truyen pha dao dong Cau 197:
Chon phat bieu dung?
A Nhung diem cach nhau bang se nguyenlan budc sring thi dao dong cung pha vdi nhau
B Nhung diem cach nhau bang se le lanbudc song thi dao dong nguoc pha vdi nhau
Trang 24C Nhung diem cach nhau bang se le lan nua
budc song thi dao dong nguoc pha vdi nhau
D Nhung diem cach nhau bang se nguyen
lan budc song tren mdt phuang truyen thi dao
dong cung pha vdi nhau Cau 198: Nhung diem
nao sau day dao dong vudng pha vdi nhau?
song
345.cach nhau bang se le lan nua budc
song tren mot phuang truyen song
budc song
tren mot phuang truyen song
Cau 199: De hai song giao thoa duoc vdi nhau
thi chung phai ci:
ACung tan se, cung bien do va cung pha
348. Cung tan se, cung bien do va
hieu pha khdng doi theo thai
gian
theo thai gian Cau 200: Chon phat bieu sai khi
noi ve su giao thoa song?
A La hien tuong hai hay nhieu song ket hop
gap nhau tai nhung diem xac dinh, ludn ludn
lam tang cuang hoac lam yeu nhau
tu hai nguon song ket hop
hop dao dong cua hai thanh phan do hai nguon
truyen den
D Bien do tong hop chi phu thuoc vao bien
do cua cac thanh phan
Cau 201: Truang hop nao sau day xem la hai
cung tan se, nguoc pha
bien do, cung pha
bien do, nguoc pha
vudng pha Cau 202: Chon phat bieu sai? Su
nhieu xa song
A la hien tuong khi gap vat can song di lech
khoi phuang truyen thang va di vdng qua vat
can
356. la hien tuong khi gap vat can
va sring bi phan xa trd lai
cach khe nho han budc song thi khe trd thanhmot nguon phat song thu cap
de quan sat hien tuong nhieuxa
Cau 203: Tren mat chat long co hai nguon song
dao dong vdi cung bien do, cung tan se va cungpha Ta quan sat duoc he cac van dei xung Neubien do cua mot nguon tang len gap ddi thiA: Hien tuong giao thoa van xay ra, hinhdang va vi trl cua cac van giao thoa khdng thaydoi
B Hien tuong giao thoa van xay ra, vi trl cacvan khdng doi nhung van cuc tieu ldn han vacuc dai cung ldn han
C: Hien tuong giao thoa van xay ra, nhung vitrl cac van cuc dai va cuc tieu doi cho cho nhau.D: Khong xay ra hien tuong giao thoa nua
Cau 204: Khi xay ra hien tuong giao thoa song
nudc vdi hai nguon ket hop nguoc pha A, B.Nhung diem tren mat nudc nam tren duangtruing truc cua AB se:
360. Dao dong vdi bien do be nhat
nhat
binh Cau 205: Sring dung la:
bi vat can
trong mot mdi truang
sring phan xa
Cau 206: Chon phat bieu sai? Trong su phan xa
song A Sring phan xa cung tan se va cung budc song vdi song tdi B Phan xa d dau ce dinh thi sing phan xa nguoc pha vdisring tdi
C O dau phan xa ce dinh la mot bung song
phan xa nguoc pha vdi songtdi
Trang 25Cau 207: Sring dung xay ra tren day dan hoi
cua day bang mot se le phan tu budc song
chieu dai cua day
nguyen lan nua budc song
nua budc sring Cau 208: Sing dung tao ra tren
day dan hoi hai dau ce dinh
khi:
A Chieu dai cua day bang mot phan tu budc
song
D Chieu dai cua day bang se nguyen lan nua
budc song Cau 209: Ung dung quan trong nhat
cua song dung la xac dinh
song
bien do song
Cau 210: De tang do cao cua am thanh do mot
day dan phat ra ta phai:
A Keo cang day dan han B Lam trung day
dan han
C Gay dan manh han D Gay dan nhe
han Cau 211: Chon cau dung? Cam giac ve am
phu thuoc vao
nguai
tai nguai nghe
Cau 212: Chon cau sai?
sing am la sing ngang
373. Trong chat ran song am chi
co song doc
nhung duang cong tuan hoan ci tan se xac dinh
nhung duang cong khong tuan hoan
Cau 213: Do cao cua am phu
Trang 26Cau 214: Do to cua am khdng phu thuoc vao dai luong vat ly nao
sau day cua am?
C do thi am D tan se am
Cau 215: Do to cua am duoc do bang
Cau 217: Chon phat bieu sai?
am thap goi la am tram
tan se tu
16Hz den 20.000Hz
la ha am
D Tai nguai khdng the nghe duoc song sieu am Cau 218: Am
manh nhat co muc cuang do am la 130dB gay dau nhuc nhei cho
tai vdi
A moi tan se B chi co am tren 1000Hz
Cau 219: Hai am thanh cri am sac khac nhau la do:
A Khac nhau ve tan se B Do cao va do to khac nhau
C Tan se, bien do cua cac hoa am khac nhau
D Cri se luong va cuang do cua cac hoa am khac nhau Cau
220: Am thanh do hai nhac cu phat ra luon khac nhau ve:
thanh do nguai hay mot nhac cu phat ra co do thi duoc bieu dien
theo thai gian co dang:
C Duang hyperbol D Duang thang Cau 222: Cuang do
am duoc xac dinh bdi:
A Ap suat tai mot diem trong mdi truang khi co song am
truyen qua
BNang luong ma sring am truyen qua mot dan vi dien tlch
vuong gric vdi phuang truyen am trong mot dan vi thai gian
khi cri sring am truyen qua
Chon dap an sai?
nguyen lan tan se am ca ban
am ca ban va mot se hoa am
C Dei vdi eng sao mdt dau kn va mot dau hd tan se hoa am
bang se nguyen lan tan se am ca ban
D Dei vdi eng sao mdt dau kn va mot dau hd se xay ra song
dung trong eng neu chieu dai eng bang se le lan mot phan tu budc
song
Cau 224: Chon cau tra lai sai
A Sring am la nhung song ca hoc doc lan truyen trong mdi
truang vat chat
B Sring am, sring sieu am, sring ha am ve phuang dien vat ll
cri cung ban chat
385.Sing am truyen duoc trong moi mdi truang vat chat dan
hoi ke ca chan khdng
chat long va trong chat khl
Cau 225: Luong nang luong duoc song am truyen trong mot dan
vi thai gian qua mot dan vi dien tlch dat vudng goc vdi phuang
truyen am goi la:
A Cuang do am B Do to cua am
C Muc cuang do am D Nang luong am Cau 226: Hai am
co cung do cao la hai am cri:
A Cung tan se B Cung bien do
C Cung budc song D Cung am sac Cau 227: Trong cac
nhac cu thi hop dan cri tac dung:
388.Vua khuech dai am, vua tao am sac rieng cua am do danphat ra
treo
Cau 228: Dieu nao sau day dung khi noi ve song am? A Tap am
la am cri tan se khdng xac dinh
am tet
ran, long,khi
di tu khdng khl vao nudc thi
Tan se khdng doi, van tec tang
D tan se khdng doi va van tec giam Cau 230: Tec do truyen am
phu thuoc vao A Tan se am va khei luong rieng cua mdi truang
truang
Tlnh dan hoi va khei luong rieng cua mdi truang
Cau 231: Chon cau dung Dac trung vat ly cua am bao gom:
397.Tan se, cuang do am, muc cuang do am va do thi daodong cua am
cua am
bien do dao dong cua am
va bien do dao dong cua am
Cau 232: Dei vdi am ca ban va hoa am bac 2 cua cung 1 day dan
Trang 27405. co cuang do bien thien tuan
hoan theo thai gian
gian
C co cuang do bien doi dieu hoa theo thai
gian
D cri chu ky khdng doi Cau 234 Chon cau
dung Cac gia tri hieu dung cua ddng dien xoay
chieu:
A duoc xxay dung dua tren tac dung nhiet
cua ddng dien
2
Cau 235 Dei vdi ddng dien xoay chieu cach
phat bieu nao sau day la dung
A Trong cong nghiep, co the dung ddng dien
xoay chieu de ma dien
410.Dien luong chuyen qua mot tiet dien
thang day dan trong mot chu ky bang khdng
thang day dan trong khoang thai gian bat ky deu
bang khdng
binh
Cau 236 Trong cac dai luong dac trung cho
ddng dien xoay chieu sau day, dai luong nao cri
dung gia tri hieu dung
A Hieu dien the B Chu ky
Cau 237 Trong cac dai luong dac trung cho
ddng dien xoay chieu sau day, dai luong nao
khong dung gia tri hieu dung
ddng dien
Cau 238 Phat bieu nao sau day la khdng dung.
A Hieu dien the bien doi dieu hoa theo thai
gian goi la hieu dien the xoay chieu
hoa theo thai gian goi la ddng dien xoay chieu
thai gian goi la suat dien dong xoay chieu
D Cho ddng dien mot chieu va ddng dienxoay chieu lan luot di qua cung mot dien trd thichung toa ra nhiet luong nhu nhau
Cau 239 Chon cau dung.
A Tu dien cho ca ddng dien xoay chieu vaddng dien mot chieu di qua
sdm pha — dei vdi ddng dien
xoay chieu qua tu dien ti le nghich vdi tan seddng dien
D Dung Huang cua tu dien ti le nghich vdichu ky cua ddng dien xoay chieu
Cau 240 Chon cau dung de tang dung khang
cua tu dien phhang co chat dien mdi la khongkhi ta phai:
dat vao hai ban tu dien
418. tang khoang cach giua hai ban tu dien
giua hai ban tu dien
tu dien Cau 241 Phat bieu nao sau day dung
dei vdi cuon cam
A Cuon cam co tac dung can trd ddng dienxoay chieu, khong cri tac dung can trd ddngdien mot chieu
B Hieu dien the giua hai dau cuon thuancam va cuang do ddng dien qua no co the dongthai bang mot nua cac bien do tuang ung cuano
C Cam khang cua cuon cam ti le nghich vdichu ky cua ddng dien xoay chieu
D Cuang do ddng dien qua cuon cam ti levdi tan se ddng dien
Cau 242 ddng dien xoay chieu qua doan mach
chi co cuon cam hay tu dien geng nhau d diemnao
dien the d hai doan mach
422. Deu co cuang do hieu dung ti le vdihieu dien the hieu dung d hai dau doan mach
tang khi tan se ddng dien
Trang 28giam khi tan se diem dien
tang
Cau 243 Phat bieu nao sau day la dung vdi
mach dien xoay chieu chi chua cuon cam
A Ddng dien sdm pha han hieu dien the mot
goc B Ddng dien sdm pha han hieu dien the
the mot goc D Ddng dien tre pha han hieu
dien the mot goc
Cau 244 Phat bieu nao sau day la dung vdi
mach dien xoay chieu chi chua tu dien
A Ddng dien sdm pha han hieu dien the mot
goc
dien the mot goc
dien the mot goc
dien the mot goc
Cau 245 Cong thuc xac dinh dung khang cua tu
dien C dei vdi tan se fla
Cau 14 Cong thuc xac dinh cam khang cua
cuon cam L dei vdi tan se fla
Trang 29Cau 246 Khi tan se ddng dien xoay chieu chay
qua doan mach chi chua tu dien tang len 4 lan
thi dung khang cua tu dien
lan
lan
Cau 247 Khi tan se ddng dien xoay chieu chay
qua doan mach chi chua cuon cam tang len 4
lan thi cam khang cua cuon cam
A Trong doan mach chi chua tu dien, ddng
dien bien thien
—
sdm pha — so vdi hieu dien the
2
428.Trong doan mach chi chua tu dien,
ddng dien bien thien
—
cham pha — so vdi hieu dien the
ddng dien bien
—
thien cham pha — so vdi hieu dien the
hieu dien the bien
—
thien sdm pha — so vdi ddng dien trong mach
Cau 249 Dat dien ap u = U0 cos(cot) vao hai
dau doan mach gom dien trd thuan R va tu dien
C mac nei tiep Biet dien ap giua hai dau dien
trd thuan va dien ap giua hai ban tu dien cri giatri hieu dung bang nhau Phat bieu nao sau day
pha — so vdi dien ap giua hai dau doan mach
—
pha— so vdi dien ap giua hai dau doan mach
Cau 250 Cuang do hieu dung cua ddng dien
chay tren doan mach RLC nei tiep khdng co
chu ky ddng dien
hai dau doan mach
dung khang cua doan mach co gia tri lan luot la
la.
1
f1
Trang 30f2
=f,
D.f2=^
Cau 252 Dung khang cua mot doan mach RLC
nei tiep co gia tri nho han cam khang Ta lam
thay doi chi mot trong cac thdng se cua doan
mach bang cach neu sau day Cach nao co the
lam cho hien tuong cong hudng dien xay ra
day
mach
439. Giam tan se ddng dien
Cau 253 Mot dien trd thuan R mac vao mach
dien xoay chieu tan se 50Hz, muen ddng dien
trong mach sdm pha han hieu
dien the giua hai dau doan mach mot goc
tu dien nei tiep vdi dien trd
cuon cam nei tiep vdi dien trd
C nguai ta phai thay dien trd noi tren bang
mot tu dien
D nguai ta phai thay dien trd noi tren bang
mot cuon cam Cau 254 Can ghep mot tu dien
nei tiep vdi cac linh ken khac theo cach nao
dudi day, de co duoc doan mach xoay chieu ma
—
ddng dien tre pha — dei vdi hieu dien the hai
dau doan mach
4Biet tu dien trong mach nay cri dung khang
bang 20(1 A Mot cuon thuan cam co cam
khang bang 20(1
bang 20(1
40( va mot cuon thuan cam co cam khang 20(1
D Mot dien trd thuan co do ldn bang 20Q vamot cuon thuan cam co cam khang 40(1
Cau 255 Mot doan mach khdng phan nhanh co
ddng dien sdm pha han hieu dien the
cam, nhung co tu dien
445. He se cdng suat cua doan mach co gia tri khac khdng
lech pha giua ddng dien va hieu dien the giam
cuang do hieu dung giam
Cau 256 Doan mach RLC nei tiep dang xay ra
cong hudng Tang dan tan se cua ddng dien va
gu nguyen cac thong se khac cua mach, ket luannao dudi day khdng dung
A Cuang do ddng dien giam, cam khang cuacuong day tang, hieu dien the tren cuon daykhdng doi
B Cam khang cua cuon day tang, hieu dienthe tren cuon day thay doi
3
—
Trang 31448.Hieu dien the tren tu giam.
Cau 257 Trong mach RLC mac nei tiep, do lech
pha giua ddng dien va hieu dien the giua hai dau
doan mach phu thuoc vao
Cau 258 Phat bieu nao sau day la khdng dung.
Trong mach dien xoay chieu khdng phan nhanh
khi dien dung cua tu dien
thay doi va thoa man dieu ken a = ,— thi
dien the giua hai dau doan mach
mach dat cuc dai
giua hai dau tu dien dat cuc dai
Cau 260 Trong doan mach RLC, mac nei tiep
dang xay ra hien tuong cong hudng Tang dan
tan se ddng dien va giua nguyen cac thong se
cua mach, ket luan nao sau day la khdng dung
A He se cdng suat cua doan
mach giam B Cuang do
hieu dung cua ddng dien
dung tren tu dien tang
giam
Cau 261 Phat bieu nao sau day la khdng dung
Trong mach dien xoay chieu khdng phan nhanh
khi dien dung cua tu dien
thay doi va thoa man dieu ken raL = —thi
cuon cam dat cuc dai
dien va cuon cam bang nhau
C tong trd cua mach dat gia tri ldn nhat
D hieu dien the hieu dung giua hai dau dien
trd dat cuc dai Cau 262 Phat bieu nao sau day
la khdng dung Trong mach dien xoay chieu khdng phan nhanh ta co the tao ra hieu dien the hieu dung giua hai dau:
A cuon cam ldn han hieu dien the hieu dung giua hai doan mach
B tu dien ldn han hieu dien the hieu dunggiua hai dau doan mach
C dien trd ldn han hieu dien the hieu dunggiua hai dau doan mach
D tu dien bang hieu dien the hieu dung giuahai dau cuon cam
Cau 263 Chon cau dung Cdng suat cua ddng
dien xoay chieu tren mot doan mach RLC neitiep nho han tlch UI la do:
dien
C hieu dien the giua hai dau doan mach vacuang do ddng dien lech pha khdng doi vdinhau
D Cri hien tuong cong hudng dien tren doan
mach Cau 264 Cong suat cua ddng dien xoay
chieu tren doan mach RLC nei tiep khdng phu thuoc vao dai luong nao sau day
D Ti se giua dien trd thuan va tong trd cua
mach Cau 265 Chon cau dung Tren mot doan
mach xoay chieu, he se cdng suat bang 0
464. doan mach co dien trd bang khdng
Cau 266 Phat bieu nao sau day la khdng dung.
A Cong suat cua ddng dien xoay chieu phuthuoc vao cuang do ddng dien hieu dung trongmach
Trang 32467.Cong suat cua ddng dien xoay chieuphu thuoc vao hieu dien the hieu dung giua haidau doan mach.
phu thuoc vao ban chat cua mach dien va tan seddng dien trong mach
D Cong suat cua ddng dien xoay chieu phu thuoc vao cong suat hao phl tren duang day tai dien Cau 37 Mach dien nao sau day co he se
cdng suat ldn nhat
A Dien trd thuan R1 nei tiep vdi dien trdthuan R2.B Dien trd thuan R nei tiep vdi cuoncam L
C Dien trd thuan R nei tiep vdi tu dien C D.Cuon cam L nei tiep vdi tu dien C
Cau 267 Mach dien nao sau day co he se cdng
suat nho nhat
L
cam L nei tiep vdi tu dien C
Cau 268 Mach dien xoay chieu RLC mac nei
tiep dang co tinh cam khang, khi tang tan se cuaddng dien xoay chieu thi he se cdng suat cuamach
C giam D bang 1
Cau 269 Mach dien xoay chieu RLC mac nei
tiep dang co tlnh dung khang, khi tang tan secua ddng dien xoay chieu thi he se cdng suatcua mach:
A khdng thay doi
B tang
C giam
D bang 0
Cau 270 Dei vdi ddng dien xoay chieu cach
phat bieu nao sau day la dung
A Trong cong nghiep, co the dung ddng dienxoay chieu de ma dien
472.Dien luong chuyen qua mot tiet dienthang day dan trong mot chu ky bang khdng
thang day dan trong khoang thai gian bat ky deubang khdng
Trang 33D Cong suat toa nhiet tuc thai co gia tri cuc
binh
Cau 271 Khang dinh nao sau day la dung Khi
hieu dien the
—
giua hai dau doan mach RLC mac nei tiep sdm
pha — dei vdi
ddng dien trong mach thi
A tan se cua ddng dien trong mach nho han
gia tri can xay ra hien tuong cong hudng
B tong trd cua mach bang hai lan thanh phan
dien trd thuan R cua mach
C hieu se giua cam khang va dung khang
bang dien trd thuan cua mach
D hieu dien the giua hai dau dien trd sdm
pha %/4 so vdi hieu dien the giua hai dau tu
dien Cau 272 Phat bieu nao sau day la khdng
dung
A Cong suat cua ddng dien xoay chieu phu
thuoc vao cuang do ddng dien hieu dung trong
mach
phu thuoc vao hieu dien the hieu dung giua hai
dau doan mach
phu thuoc vao ban chat cua mach dien va tan se
ddng dien trong mach
D Cong suat hao phl tren duang day tai dien
khdng phu thuoc vao chieu dai cua duang day
tai dien Cau 273 Phat bieu nao sau day la dung.
A Ddng dien xoay chieu mot pha chi co the
do may phat dien xoay chieu mot pha tao ra
476.Suat dien dong cua may phat dien
xoay chieu ti le vdi se vdng quay trong mot
phut cua rd to
chieu tao ra ludn co tan se bang tan se quay cua
rd to
mdi tao ra tu truang quay
Cau 274 Doan mach dien xoay chieu gom dien
trd thuan R, cuon day thuan cam L va tu dien C
hieu dien the tuc thai d hai dau cac phan tu R, L
va C Quan he ve pha cua cac hieu dien the nay
Cau 275 Ddng dien xoay chieu trong doan
mach chi co dien trd thuan
A cung tan se vdi hieu dien the d hai daudoan mach va cri pha ban dau ludn bang 0
B cung tan se va cung pha vdi hieu dien the
d hai dau doanmach
—
C luon lech pha — so vdi hieu dien the d hai
dau doan2
hai dau dien trd thuan R, cuon day thuan cam L
dau doan mach
2
—
dau doan mach
4
Cau 277 Dat hieu dien the u = U0sinat (U0
khdng doi) vao hai dau doan mach RLC khdngphan nhanh Biet dien trd thuan cua machkhdng doi Khi co hien tuong cong hudng dientrong doan mach, phat bieu nao sau day sai
Trang 34481.Cuang do hieu dung cua ddng dien
trong mach dat gia tri ldn nhat
mach cung pha vdi hieu dien the tuc thai d hai
dau dien trd R
cua doan mach bang nhau
D Hieu dien the hieu dung d hai dau dien trd
R nho han hieu dien the hieu dung d hai dau
doan mach Cau 278 Trong mot doan mach
dien xoay chieu khdng phan
nhanh, cuang do ddng dien sdm pha p ^ 0 < p <
hieu dien the d hai dau doan mach Doan mach
do A gom dien trd thuan va tu dien
dien
thuan cam
Cau 279 Dat mot hieu dien the xoay chieu co
gia tri hieu dung khdng doi vao hai dau doan
mach RLC khdng phan nhanh cuon day thuan
cam Hieu dien the giua hai dau
A doan mach ludn cung pha vdi ddng dien
trong mach
487.cuon day ludn nguoc pha vdi hieu dien
the giua hai dau tu dien
the giua hai dau tu dien
ddng dien trong mach
Cau 280 Khi dat vao hai dau doan mach gom
cuon day thuan cam mac nei tiep vdi dien trd
thuan mot hieu dien the xoay
lan gia tri cua dien trd thuan Pha cua ddng dien
trong doan mach so vdi pha hieu dien the giua
hai dau doan mach la
—
C nhanh han goc 6 D cham han goc 6
Cau 281 Dat mot hieu dien the xoay chieu co
tan se thay doi duoc vao hai dau doan machRLC khdng phan nhanh Khi tan
Trang 35se ddng dien trong mach ldn han gia tri ~ ~f=
2—\/
LC
dien trd bang hieu dien the hieu dung giua hai
dau doan mach
cuon day nho han hieu dien the hieu dung giua
hai ban tu dien
C ddng dien chay trong doan mach cham
pha so vdi hieu dien the giua hai dau doan
mach
D hieu dien the hieu dung giua hai dau dien
trd ldn han hieu dien the hieu dung giua hai dau
doan Cau 282 Mot doan mach dien xoay chieu
gom dien trd thuan, cuon cam thuan va tu dien
mac nei tiep Biet cam khang gap ddi dung
khang Dung von ke xoay chieu (dien trd rat
ldn) do dien ap giua hai dau tu dien va dien ap
giua hai dau dien trd thi se chi cua vdn ke la nhu
nhau Do lech pha cua dien ap giua hai dau
doan mach so vdi cuang do ddng dien trong
phan nhanh, cuang do ddng dien tre pha so vdi
hieu dien the
giua hai dau doan mach, thi doan mach nay
gom
cam khang nho han dung khang
Cau 284 Trong doan mach dien xoay chieu
gom dien trd thuan, cuon cam thuan va tu dien
mac nei tiep thi
vdi dien ap giua hai dau doan mach
pha vdi dien ap giua hai dau tu dien
C dien ap giua hai dau tu dien tre pha so vdidien ap giua hai dau doan mach
D dien ap giua hai dau cuon cam tre pha so
hai dau doan mach
Cau 285 Dat dien ap xoay chieu u = Uocos2—
dau doan mach co R, L, C mac nei tiep Khi f =
tri cua f la2—
Cau 286 Dat dien ap u = Uocos(at) vao hai daudoan mach mac nei tiep gom dien trd thuan R,
tu dien va cuon cam thuan co do tu cam L thaydoi duoc Biet dung khang cua tu dien bangR\/3 Dieu chlnh L de dien ap hieu dung giuahai dau cuon cam dat cuc dai, khi do:
—
A dien ap giua hai dau tu dien lech pha — so
vdi dien ap
6giua hai dau doan mach
B dien ap giua hai dau cuon cam lech pha —
so vdi dien ap
6giua hai dau doan mach
C trong mach ci cong hudng dien
D dien ap giua hai dau dien trd lech pha so vdi
dien ap
6
giua hai dau doan mach
Cau 287 Dat dien ap u=Ucosat vao hai dau
cuon cam thuan cri do tu cam L thi cuang dodong dien qua cuon cam la
Trang 36Cau 289 Doan mach dien xoay chieu khdng
phan nhanh gom cuon day co do tu cam L, dien
trd thuan R va tu dien co dien
dung C Khi ddng dien co tan se goc
mach thi he se cdng suat cua doan mach nay
A phu thuoc dien trd thuan cua doan mach
B bang 0 C phu thuoc tong trd cua doan
Cau 290 Cho doan mach gom dien trd thuan R
nei tiep vdi tu
dien co dien dung C Khi ddng dien xoay chieu
Cau 291 Doan mach dien xoay chieu gom bien
trd R, cuon day thuan cam co do tu cam L va tu
dien co dien dung C mac nei tiep Biet hieu dien
the hieu dung hai dau doan mach la U, cam
se ddng dien trong mach khdng doi Thay doi Rden gia tri R thi cong suat tieu thu cua doan
Trang 37thuan R va tu dien co dien dung C mac nei tiep
Khi
a <
thuan R bang dien ap hieu dung giua hai dau
doan mach
thuan R nho han dien ap hieu dung giua hai dau
doan mach
C cuang do ddng dien trong doan mach tre
pha so vdi dien ap giua hai dau doan mach
D cuang do ddng dien trong doan mach
cung pha vdi dien ap giua hai dau doan mach
Cau 294 Dat dien ap xoay chieu u=U cosrat cri
U khdng doi
0 0
va ra thay doi duoc vao hai dau doan mach cri
R L, C mac nei tiep Thay doi ra thi cuang do
ddng dien hieu dung trong mach khi ra = ra
bang cuang do ddng dien hieu dung trong mach
Cau 295: Trong doan mach xoay chieu khdng
phan nhanh, cuang do ddng dien nhanh pha so
vdi hieu dien the Dieu khang dinh nao sau daydung:
L
499. Doan mach gom R va C
Cau 296: Tac dung cua cuon cam dei vdi ddng
dien xoay chieu la
A gay cam khang nho neu tan se ddng dien ldn
502. gay cam khang ldn neu tan seddng dien ldn
dien xoay chieu
qua theo mot chieu
Cau 297: Tac dung cua tu dien dei vdi ddng
neu tan se ddng dien nho
se ddng dien ldn
dien xoay chieu
qua theo mot chieu
Cau 298: Cuang do ddng dien ludn ludn tre pha
so vdi hieu dien the d hai dau doan mach khi
Cau 299: Trong doan mach xoay chieu RLC nei
tiep, cuang do ddng dien chay qua mach sdm
pha han hieu dien the d hai dau mach khi
Cau 300: Trong doan mach xoay chieu RLC nei
tiep, hieu dien the d hai dau dien trd thuan Rcung pha vdi hieu dien the d hai dau mach khi
Trang 38cam L va mot tu dien co dien dung C Tan se
ddng dien xoay chieu tang thi:
D dung khang ZC giam va cam khang ZL
tang Cau 302: Trong doan mach xoay chieu co
cac phan tu mac nei tiep, neu cuang do ddng
dien i vudng pha vdi hieu dien the u thi trong
mach:
A khdng co dien trd thuan R
Cau 303 Dat dien ap u=Ucosat vao hai dau
cuon cam thuan co do tu cam L Tai thai diem
dien ap giua hai dau cuon cam co do ldn cuc dai
thi cuang do ddng dien qua cuon cam bang
Cau 304 Dat vao hai dau doan mach chi co dien
trd thuan R mot dien ap xoay chieu co bieu thuc
dien trd co bieu thuc i = I-\/2cos(at + , trong do I
Cau 305 Hieu dien the va cuang do ddng dien
trong doan mach chi co cuon day thuancam co dang
—6
tri nao sau day?
0 U0 6 ^
Cau 306 Trong doan mach dien xoay chieu chi
co cuon day thuan cam co do tu cam L, dien ap
cos(at) thi cuang do dien chay qua doan
La
3
Trang 39Cau 307 Hieu dien the va cuang do ddng dien
tri nao sau day:
Cau 308 Mot cuon day co dien trd thuan R, he
se tu cam L mac vao hieu dien the xoay chieu u
do hieu dung cua ddng dien qua cuon day duocxac dinh bring he thuc nao?
Cau 313 Cho doan mach gom cuon day thuan
cam L ghep nei tiep vdi tu dien C Tan se goc cua hieu dien the dat vao 2 dau mach la a Dieu nao sau day la sai ? A Mach khdng tieu thu cdng suat
Ca1
2
519. -Tong trd cua doan mach Z = La
neu LCa > 1
Ca
D He se cdng suat cua doan mach bang 1
Cau 314 Chon cau dung Mot doan mach gom
mot dien trd thuan R nei tiep vdi mot tu dien codien dung C Dat vao hai dau doan mach mot
hieu dung cua ddng dien qua mach duoc xacdinh bang he thuc sau day:
B I
V RW LJ
R + aL
Ca U
D I = U V R2+
LaV R2
2+ a2L2
+ (La L)2 Ca
Cau 309 Chon cau
sai trong cac causau:Mot doanmach co ba thanhphan R, L, C macnei tiep nhau, macvao hieu dien the
D
Cau 310.
Trong machdien xoay chieukhdng phanhnhanh RLC dolech pha giua hieudien the giua haidau toan mach va
—
cuang do ddng dien trong mach la:
tlnh dung khang
521.Mach co tlnh cam khang
tlnh trd khang
cong hudng dien
Cau 312 Cuang do
ddng dien di quamach RLC mric teitiep cri bieu thuc: i
trd cua doan mach
va do lech pha cpcri bieu thuc tuangung nao sau day:
La - Ca2
Trang 40Cau 315 Chon cau
dung Mot doan
mach gom mot
cuon cam thuan L
nei tiep vdi mot tu
dien co dien dung
C Dat vao hai dau
doan mach mot
hieu dien the xoay
Cuang do hieu
dung cua ddng
dien qua mach
duoc xac dinh bang
he thuc sau day:
1
C I =
4 2
^
(aL-aC)a
C
Cau 316 Trong cac
bieu thuc cua gia trihieu dung cuaddng dien xoaychieu sau,hay choncong thuc sai :
B.U
= 2
U L
4 2
I0
fo
D f