Đề thi thử lý năm 2015 - Có giải chi tiết kèm theo (63)

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  1

ĐỀ THI GỒM 50 CÂU ( TỪ CÂU 1 ĐẾN CÂU 50 ) DÀNH CHO TẤT CẢ THÍ SINH

Câu 1: (ID: 79739) 



A. 14,4 mJ B. 12,3 mJ C 10,35 mJ D 13,95 mJ
Câu 2: (ID: 79744) 



A B. C. D. 9,32 
Câu 3: (ID: 79745) 

  
sóng là:
A. 100m B. 157m C. 132,29m D. 175m
Câu 4: (ID: 79746)                  
vòng/phút, má

A. 600 vòng/phút B. 750 vòng/phút C. 1200 vòng/phút D. 300 vòng/phút
Câu 5: (ID: 79747) 
A. 

B. 
C. 
D. - A
Câu 6: (ID: 79748) RLC n

2
sin100

A.  B. C.  D. 
Câu 7: (ID: 79775) không 
hoàn?
A. x = 3tsin (100t + /6) B. x = 3sin5t + 3cos5t
C. x = 5cost + 1 D. x = 2sin
2
(2t +  /6)
Câu 8: (ID: 79776)  
A. Sóng c B. Sóng dài C. Sóng ng D. Sóng trung

SỞ GD VÀ ĐT THANH HOÁ
TRƯỜNG THPT HÀ TRUNG.
ĐỀ THI THỬ THPT QUỐC GIA LẦN I
NĂM HỌC 2014 – 2015
Môn thi: VẬT LÝ
Thời gian làm bài: 90 phút, không kể thời gian phát đề.



Mã đề thi: 219

 trang )

  2

Câu 9: (ID: 79777) 
:
A. 0,60A B. 0,77A C. 0,06A D. 0,12A
Câu 10: (ID: 79778) Hai chm chuyng trên hai qu o song song sát nhau, cùng gc ta  vi
: x
1
= 3cos(t)(cm) và x
2
= 4sin(t)(cm). Khi hai chm  xa nhau nht thì chm
 bao nhiêu?
A.  1,8cm B. 0cm C.  2,12cm. D.  1,4cm.
Câu 11: (ID: 79779) Cho hai n
1
,S
2



1
S
2
:
A. 7 B. 9 C. 5 D. 3
Câu 12: (ID: 79781) Mt con lu hòa v 6cm và chu kì 1s. Ti t = 0, v
qua v trí cân bng theo chiu âm ca trc to . Tc ca vt trong khong thi
gian 2,375s k t thc chn làm gc là:
A. 48cm B. 50,75cm C. 55,76cm D. 42,56cm
Câu 13: (ID: 79782) 

x
1
= - 0,5A (
2

A. 1/10 s. B. 1 s. C. 1/20 s. D. 1/30 s.
Câu 14: (ID: 79783)
A. 
B. 
C. 
D. 
Câu 15: (ID: 79784)sai :
A. 
B. 
C. 
D. 
Câu 16: (ID: 79786) 
u = 8cos(2000.x + 
qua :

A. 100 cm/s B. 4,44 cm/s. C. 444 mm/s. D. 100 mm/s.
Câu 17: (ID: 79791) 

0
s).
:
A. 8,5 C. B. 5,7 C. C. 6 C. D. 8 C.
Câu 18: (ID: 79794) 

A.

5
2,5cos( )(cm)
6
xt




B.
2,5cos( )(cm)
3
xt




C.
2cos( )(cm)
3

xt




D.
5
2cos( )(cm)
6
xt




4
2
v (cm/s)
O
t (s)
5
12

-4

  3

Câu 1 (ID: 79797) 

A.  B
C.  D. .
Câu 20: (ID: 79798) 


.10
2
smg 


2
= 10.




A. 70cm B. 50cm C. 80cm D. 20cm.
Câu 21: (ID: 79810) 

0
180

 




A.
/ 2.Q


B.
2.Q

C.
.Q

D.
/2.Q


Câu 22: (ID: 79812) 



/1
H

C =
) (/50 F


)( 200cos250 100cos210050 Vtt


.

A. 50 W. B. 200 W. C. 100 W D. 40 W.
Câu 23: (ID: 79814) sai  sóng âm?
A. Sóng 
B. 

C. 
D. 
Câu 24: (ID: 79816) 

1
/6ts




2
5 /12ts




A. 24 cm/s. B. 12 cm/s. C. 16 cm/s. D. 8 cm/s.
Câu 25: . (ID: 79818) m, 
, 
Cho g= 10 m/s
2
.
A.8,66 m/s B. 7,07 m/s C. 6,25 m/s D. 25 m/s
Câu 26: (ID: 79824) 


2
; 
2



A. 20. B. 14. C.10 D. 18.
Câu 27: (ID: 79830) l = 1 m 

0,15 rad



0,75 ,BT

2
10 / .g m s

 là:
A. 0,36 V. B. 0,72 V. C. 0,18 V D. 2,34 V.

  4

Câu 28: (ID: 79831) 



A . 4,47cm B. 4,25cm C.
32cm
D.
22cm

Câu 29: (ID: 79833) 


                   
smvsm /350/300 


A. 1 B .2 C. 3 D. 4
Câu 30 : (ID: 79843) (cm). 

A. 10 cm B. 20 cm C. 15,5 cm D. 25,5 cm
Câu 31: (ID: 79844)   m/s
2
.
 :
A.5 m/s B . 10 m/s C. 1,5 m/s D. 0,5 m/s
Câu 32. (ID: 79845) Con lc lò xo treo thng, ti v trí cân bng lò xo dãn l qu
nng vi chu kì T. Trong mt chu k khong th
trng lc và li tác dng vào vt cùng chiu vi nhau là
T
4
 ng ca vt là:
A.
3
2
l. B. 2.l. C.
2
l. D. 1,5.l.
Câu 33: (ID: 79846) Mt vu hòa quanh v trí cân bng O v 10cm. Trong 1s,
ng ln nht vng ln nht vc là :
A.
20 2

cm B. 50 cm C.
10 3
cm D. 20 cm
Câu 34: (ID: 79851) Mt không ma sát trên mng dc xui, góc nghiêng ca dc
so vi mt phng nm ngang là  = 30
0
. Treo lên trn toa xe mt con lm dây treo chiu dài l =
1(m) ni vi mt qu cu nh. Trong tht xung, kích thích cho con lu hoà
v góc nh. B qua ma sát, ly g = 10m/s
2
ng ca con lc là:
A. 2,315s B. 2,809s C. 2,135s D. 1,987s
Câu 35: (ID: 79854) 
 
A.  B. 
C.  D. 
Câu 36: (ID: 79857) 
 
3
m/s
2

A. 16 cm. B. 10
3
cm. C. 4 cm D. 4
3
cm.
Câu 37: (ID: 79859) 

C = 10 µ

:
A. 0,122 A. B. 1,22 A. C. 1,22 mA. D. 12,2 mA

  5

Câu 38. (ID: 79861) 
thì chu kì 
2


A. 
2
. B. 
2
.
C
2
D. 
2
.
Câu 39: (ID: 79863) 

1

2
= 1,2


2

= 5A.
Xá
2


A.5V B. 6V C.12V D. 6,5V
Câu 40: (ID: 79865)  
có 
1
và f
2


A. 46,6.10
4
Hz và 43,710
4
Hz B. 47,14.10
4
Hz và 53,03.10
4
Hz
C. 47,14.10
3
Hz và 53,0310
3
Hz D. 51,47.10
3
Hz và 48,53.10
3

Hz
Câu 41. (ID: 79868) 

L
Z
C
= 2Z
L


A. 40 V. B. 43 V. C. 55 V D. 50 V.
Câu 42. (ID: 79870) 
0


0


A.0,87 B. 0,67. C. 0,50. D. 0,71.
Câu 43. (ID: 79873) 
3
 

0
. cos (100

A. 1,114 H B. 0,955 H. C. 0,5 H. D. 0,318 H.
Câu 44. (ID: 79876) Con lc lò xo treo thm treo  cng lò xo là 10N/m. T v trí cân
bng, nâng vn 30cm ri buông nh cho vu hòa thì thy chu k ng ca vt
là 1 giây. Ly g = 10(m/s

2

2
(m/s
2
). Ly ci tác dm O là:
A.1,55 N B. 0,5 N C. 0,55 N D. 1,25 N
Câu 45. (ID: 79878) Mt con lc lò xo treo thng gm vt nng có khng m=100g và lò xo khng
. Chn gc t  v trí cân bng (VTCB), ching lên. Bit con lng theo

x = 4cos(10t +
3

)cm. Ly g =10m/s
2
 ln li tác dng vào vt ti thm vc quãng
ng s = 3cm (k t t=0) là:
A.1,1N B. 1,6N C. 0,9N D. 2N
Câu 46. (ID: 79880)


 F = cos(
2
.2


t

2

= 10. B
là:
A.
1 cm
B.
10 cm
C.
8 cm
D.
25 cm

  6

Câu 47. (ID: 79882) 
2



L


 
A.8 µF. B. 50 µF. C. 15,9 µF. D. 31,8 µF.
Câu 48. (ID: 79885) 
 :
A.  B.  C.  D. 

Câu 49: (ID: 79889) 
 :
A. 8 B. 9 C. 19 D. 2
Câu 50: (ID: 80035)  
1
50 

L =   
 

max

A.

1
thêm 20 
. B

1
.
C.

1

D.

1
thêm 10 



LỜI GIẢI CHI TIẾT
Câu 1:

2
/2, 4kS
2
/2, 9kS
2


= W - W
=>
mJ
SAk
mJ
SAk
6,12
2
)4(
95,13
2
)(
22
22




=>
mJ

kS
mJ
kA
45,0
2
4,14
2
2
2







Câu 2: 
)1(15,1
15,0
UUo
UIUIIUoPPP
taiHPnguon




=>
UUoUI
UII
Uo 015,10'

100
15,0
10
'. 
(2)

=>
15,1
015,10'

Uo
Uo
=8,7


  7

Câu 4: Ta có:
Hz
pn
f 60
60
4.900
60
11
1




<=>
600
6
60.60
.60
60
.
2
1
2
22
21

p
f
n
pn
ff
vòng/phút


Câu 5: x = Asinwt = Acos(wt -
2

) = 0



Câu 6: Ta có:



80
10.8,39.100
11
200100.637,0
6


wC
Zc
wLZl


90;160
)80200(
.150
90
)(
22
2
22
2





 RR
R
R
ZcZlR
RU
P



Câu 7: 
 A.

Câu 8: Ta có:
m
f
c
100
10.3
10.3
6
8






Câu 9: Ta có:
A
L

C
UoIo
CUoLIo
WđWt 6,0
10.5
10.50
6
22
maxmax
3
622






Câu 10: 
)
10
7
cos(5cos3sin4
12

 wtwtwtxxx

 
cmx 8,1~)
10
7

cos(3
1


hay
cmx 8,1)
10
7
cos(3
1






Câu 11: Trên S
1
S
2

5,25,2
2121
 k
SS
k
SS







  8

Câu 12: t = 2,375s = 2T + 3T/8


cmAAS 76,7)
2
2
1(66)
2
2
1(' 

 + S' = 48 + 7,76
= 55,76cm


Câu 13: Ta có: T = 1/f = 1/5s

1
-
2
 
x
1

-x
2
= + 0,5A 
=> t = T/6 = 1/30s


Câu 14: 

Câu 15: 

Câu 16:
.1,0
2
20 cm
x
x 





=>
scmfv /1001000.1,0 




Câu 17:  8/3 (
=16


s.
=> w =
srad
T
/10.
8
2
6




Qo = Io/w =
C


65,5
10.
8
22,2
6




Câu 18: 

3






0
2
max
max
 v
v
là:
t =
sTs
TTT
1
12
5
12
5
46

=> w =

2
rad/s.
=

  9

)

3
2cos(4


 tv



cmttx )
6
5
2cos(2)
23
2cos(2








Câu 19: 

Câu 20: 
.10cm
g
km
A
B



Ta có:
.
5
2 s
k
m
T
A





.50
2

2
1
2
1
2
2
2
cm
T
ggtS
B



.8050102022 cmSlAd
B




Câu 21: 

vòng dây là:
R
BS
R
BSBS
t
t
R
t
R
tIQ
2180cos0cos
.
.

0









 
dây là:
2
Qw
R
BSw
R
Eo
Io 



Câu 22:






100
10.
50
.200
11
200
10.

50
.100
11
200
1
.200
100
1
.100
6
2
2
6
1
1
22
11








Cw
Zc
Cw
Zc
LwZl

LwZl

=>


550)100200(50)(
550)200100(50)(
222
22
2
2
222
11
2
1
ZcZlRZ
ZcZlRZ

  10


W
R
Z
R
Z
R
R

RIRIRIP
10050.)
550
50
(50.)
550
100
(50.)
50
50
(
)
50
(.)
100
()
50
(
222
2
2
2
1
2
2
2
2
1
2






Câu 23: 

Câu 24: 
1
/6ts





2
3
2.4
3
2
22
A
x
kAkx


=> t1 = T/6 => T =
)(s




2
5 /12ts



ta có:
12
5
12
5
2
T
st 


=> s = A + A(1 - 1/2) <=> 3A/2=12cm
=> A = 8cm.

scmA
T
wAv /168.
2
.
2
max






Câu 25: 
 có:
smglv
mgl
l
v
ml
mgl
wml
mglIw
WtWđ
/66,85,2.8,9.33
2

6
1
2

3
1
.
2
1
22
2
2
222
2






Câu 26: Ta có: S =
sttgat 10.3.
2
1
1500
2
1
22



s
gag
l
1
4
1
22 



=> 



Câu 27: Ta có:

dt
BnBSd
dt
d
e
));cos((






trong dó:

  11

B= 0,75 = const. ;
);( Bn


= 90
V
BnwlB
e
wt
BnwlB
e
wtl
lS

o
o
o
18,0
2
1.
1
10
.15,0.75,0
2
);cos(.
)sin(.
2
);cos(.
2
)cos(

2
2
2
max
2
2
2



















Câu 28: Ta có:
cmA
m
Mm
Mm
k
m
k
w
v
w
v
A
A
vv 47,4'
'
'
'

'
max
max
maxmax








Câu 29: 
=>
m
lf
v
f
mvm
kl
4
444
)12( 



5/350/300  msmvsm

Laijc ó:
4

)12(

 kl
=> k = 2
=> 2 


Câu 30: Ta có:
s
w
T 1
2




S = 4A = 4.5 = 20cm.


Câu 31: Ta có:

202  fw
rad/s.

sm
w
a
v /5
20
100

max
max






Câu 32: 
xo nén

2
2
)
8
.cos(
AT
wAx 

=>
2
2
2
lA
A
l 

  12



Câu 33:  = A

2
0
2
AA



2
0
2
AA

u âm
=> t = T/6 => T = 6s
Laijc ó: 2s = T/3

cmA
A
S 3103
2
3
.2 



Câu 34: ng ca con lc là:
s
g
l
T 135,2
30cos.10
1
2
cos
2
0







Câu 35: 

LC

2




Câu 36: Ta có:
srad
m

k
w /10
2,0
20



cmA
w
a
w
v
A 416
10
3.200
10
20
4
2
2
2
4
2
2
2
2




Câu 37: Ta có: Wc = Wl <=>
2
.
2
22
IoLCUo


=> Io =
2,0
10.10.
622 

Uo
L
CUo
= 5
Uo
3
10.2

=> Uo = 100
2
Io

1)
2100
1
()
10.10

(1)()(
22
3
22


Io
IoUo
u
Io
i
=> i = 12,2mA.


Câu 38: 

=>
2
/5,1
2
2
0846,1
'
sma
ag
g
g
l
ag
l

T
T








  13


2



Câu 39: Ta có:
VU
U
k
rIU
U
610
2,1.5
120
.
2

22
1







Câu 40: 
1
và f
2
là

kHzf
vv
vv
f
d
d
14,4710.50.
10340
10340
3
1










kHzf
vv
vv
f
d
d
03,5310.50.
10340
10340
3
2










Câu 41:  
u =
Vuuu
LcR

55
2
30
3040 



Câu 42: 
UUUUUU
XR
 94,05,08,0
2222
22


Ta có:
)2()8,0()(
)1(5,0
2222
22
UUUUUUUU
UUUUx
Y
r
Y
rR
Yr



 (2) => Ur = 0,06875U
=> 
86875,0cos 


U
UU
rR




Câu 43: Ta có: Ul =
2
2
2
2
22
)()(
.
Zl
ZcZl
Zl
R
U
ZcZlR
ZlU


