ĐỀ THI THỬ ĐẠI HỌC NĂM 2012-2013- ĐỀ 009 pot

ĐỀ ÔN TẬP SỐ 010 Câu 1:    2   2    A. 100 V. B. 100 2 V. C. 100 3 V. D. 120 V.  1 = 1 11 R CL U UU  ; tan 2 = 2 22 R CL U UU   1 +  2 = /2 > tan 1 tan 2 = 1 11 R CL U UU  2 22 R CL U UU  = -1 (U L1  U C1 ) 2 .(U L2  U C2 ) 2 = 2 1R U 2 2R U > 2 1MB U 2 2MB U = 2 1R U 2 2R U > 8 4 1MB U = 2 1R U 2 2R U .(*) (vì U MB2 = 2 2 U MB1 )  2 1R U + 2 1MB U = 2 2R U + 2 2MB U (= U 2 ) > 2 2R U = 2 1R U - 7 2 1MB U (**)  4 1MB U = 2 1R U 2 2R U = 2 1R U ( 2 1R U - 7 2 1MB U ) > 4 1R U - 7 2 1MB U 2 1R U - 8 4 1MB U = 0 > 2 1R U = 8 2 1MB U 2 1R U + 2 1MB U = U 2 > 2 1R U + 8 2 1R U = U 2  > U R1 = 3 22 U = 100 2 (V). Chọn B Câu 2:   A = u B = acos20   A. 5 cm. B. 2 cm. C. 22 cm. D. 4 cm. 2 1 2 1 2 1 1 2 1 2 4 4,75 4,75 2 cos( ) os 44 4 4 cm k d d d d u a c t d d k d d k                      1 2 1 2 1 2 4 4 12 4 k d k d d            CÁCH 2 uA = uB = acos20t và 2 1 2 1 2 cos( ) os 44 M d d d d u a c t          TH1:   21 1 21 2 2 4 2 ( 2 ) 4 dd k cungpha nguon dd k cucdai A              TH2:     21 1 21 2 (2 1) 4 (2 1) 2 4 dd k nguocpha nguon dd k cucdai A                   có 2 1 1 2 1 2 4 4 d d k d d k         Phong\ Câu 3:      R = U Lr = 25V; U C   A.  B.  C.  D.   Ta có U r 2 + U L 2 = U Lr 2 (U R + U r ) 2 + (U L  U C ) 2 = U 2  2 (V) U r 2 + U L 2 = 25 2 (*) (25+ U r ) 2 + (U L  60) 2 = U 2 = 3200 625 + 50U r + U r 2 + U L 2 -120U L + 3600 = 3200 12U L  5U r = 165 (**)  * U L1 = 3,43 (V) > U r1 = 24,76 (V)  2 * U L = 20 (V) > U r = 15 (V) Lúc này cos = U UU rR  = 2 1 P = UIcos > I = 1 (A) Do đó r = 15 Ω. Chọn đáp án A Câu 4: Trong thí -  1 = 450nm và  2 =    A. 5 B. 3 C. 6 D. 4 Câu 5:     A. 4. B. 8. C. 6. D. 10. K Nam 2a O M 1 M 2 2a H   => KH = 4a   A M = 2a  sin   x2  ho A M = a =>  sin   x2  = 2 1 (*)  U Lr U U C U L U r U R  1 và M 2  1 = x 1 và OM 2 = x 2 ; x = x 2  x 1   x 1 = 12  và x 2 = 12 5   cm6020 31212 5 x      4 60 120.2L2 n 2 n     Câu 6:  -27  kì  A. 10 -6 % B. 4,29.10 -4 % C. 4,29.10 -6 % D. 10 -7 %   3 3 6 3 0 2,5.10 / 4.10 4,29.10 2,5.10 sN v m s t N         Câu 7:  U L , U C , UU L = U C. 2 và U = U C   A.   B.  C.  D. Do U L > U C nên Z L > Z C và trong  Câu 8:     2   2     A. 100 V. B. 100 2 V. C. 100 3 V. D. 120 V.   2 2 2 R LC U U U (1)  '2 '2 2 R LC U U U (2) + ' 22 LL UU (3)  ' '' ' ' tan tan ' 1 1 2 LC LC LC R LC R R R U U U UU U U U               (4)  ' 22 LC R R U U U  (5)  4 2 22 8 8 LC R LC U U UU   (6)  LC = U/3 = 50V (7)  R = U AM = 100 2 V  B Câu 9:  A.  B.   C.  D.  Câu 10:  max   max và I max là A. ax axmm C QI L   . B. ax axmm LC QI   . C. ax axmm Q LCI . D. ax ax 1 mm QI LC  . Câu 11:  1, T 2 T 2 =2T 1 . Trong cùng 1   A. 1/16  B. 15/16  C. 7/8  D. 1/8  Câu 12:  3   /4 200 2 cos(100  A. 200 W B. 228W C. 100W D. 50W Câu 13:  0    A.  2 = 22 0 2 Ii q  B.  2 = 22 0 Ii q  C.  2 = 22 0 2 Ii q  D.  2 = 22 0 Ii q  Câu 14:   C 1  2 < C 1  1 , C 2   1 , C 2  f 3 f 4   1 và  2  8 m/s. A.  1 = 75m;  2 = 100m. B.  1 = 100m;  2 = 75m. C. B.  1 = 750m;  2 = 1000m. D.  1 = 1000m;  2 = 750m. Câu 15:  1 , S 2  1 = asin(  t), u 2 = acos(  t) S 1 S 2 = 9 1 S 2  1 cách S 1 , S 2 bao nhiêu. A. 39/8 B. 41/8 C. 45/8 D. 43/8 Câu 16:   1  2   1  2  A.  1  2 . B.  1  2 . C.  1  2 . D.  1 = 2 2 . Câu 17:  .  phát là A.10 5 V B.28V C.12 5 V D.24V Giải: cos = d Z r =0,8 => Z d = 10 và Z L = 6,  r P = 2 (A)  U = I 22 )( L ZrR  = 2 22 612  = 12 5 (V) Chọn đáp án C Câu 18:     100g, ,       = 10 m/s 2  T.            F    ,            75%.  F  : A. 5 N B. 10 N C. 20 N D. 15 N Câu 19:  A.  B.  C.   D.   Câu 20: ,     .   2       = U 0 ft)   f     . Khi f = f 1 = 36  f = f 2 = 64           1 = P 2 . Khi f = f 3 = t  M M N u(mm N 5 4 -4 -5 P P N A 48Hz th 3 , khi f = f 4 = 50           4 .        : A. P 3 < P 1 B. P 4 < P 2 C. P 4 > P 3 D. P 4 < P 3 Câu 21:   2cos2U ft  f  f 1  f 2   f 1 và f 2 là A. f 2 = 1 3 . 2 f B. f 2 = 1 4 . 3 f C. f 2 = 1 3 . 4 f D. f 2 = 1 2 f Câu 22:    A. 375 mm/s B. 363mm/s C. 314mm/s D. 628mm/s  hình      0 0 0 3 1.360 4 60 30 8 8.10 6 cos60 A mm m            = 0,08s 3 max 2 2 2 8.10 . 0,628 / 628 / 0.08 0.08 V A m s mm s T               Câu 23:      A. 3. B. 6. C. 10. D. 5. Câu 24: s  0,5s là 16cm A. 8cos(2 ) 2 x t cm    ; B. 4 os(4 ) 2 x c t cm    ; C. 8 os(2 ) 2 x c t cm    ; D. 4 os(4 ) 2 x c t cm    ; Câu 25:     A. 3mg k B. 2mg k C. 3 2 mg k D. mg k GIẢI:  Ban đầu: Vật cân bằng ở O:   k mg lA 2   Sau khi giảm khối lượng:  k mg l  ' .            k mg k mg k mg lllA 22 '' k mg A 3 ' . CHỌN ĐÁP ÁN A Câu 26:   o f 1  1  0  f 2  2 . So sánh A 1 và A 2 A. A 2  A 1 B. A 2 = A 1 C. A 2 < A 1 D. A 2 > A 1 Câu 27:  A.  B.  C.  D.  Câu 28:  A.  B.  C.    D.  Câu 29: c sóng 0,320 A.  B.  C.   D.  Câu 30:  f 1  1   2  1 ? A. 80Hz B. 50Hz C. 60Hz D. 70Hz Giải: cos 1 = 0,6 > tan 1 = 3 4 tan 1 = rR Z L  = 3 4 > Z L = 3 4 (R + r) (*) cos = 0,8 > tan = ± 4 3 tan = rR ZZ CL   = ± 4 3 > Z L  Z C = ± 4 3 (R +r) (**) C L Z Z = 2 1  LC và 2 2  LC = 1 > C L Z Z = 2 2 2 1   = 2 2 2 1 f f > f 1 = f 2 C L Z Z * Khi Z L  Z C = 4 3 (R +r) > Z C = 12 7 (R +r) > C L Z Z = 7 16 > f 1 = 7 4 2 f = 151,2 Hz  ** Khi Z L  Z C = - 4 3 (R +r) > Z C = 12 25 (R +r) > C L Z Z = 25 16 f 1 = f 2 C L Z Z = f 2 . 5 4 = 80Hz. Chọn đáp án A Câu 31: t - 6  ) (cm).       4 3 (cm/s)   2012           C L; r R N B A M A. 12 12071 (s). B. 12 6036 (s). C. 12 12072 (s). D. 12 6035 (s). Giải- -   3 (cm/s  0 x 0 = 2 3 (cm) , v 0 > 0 - 8sin(2t - 6  ) cm/s. = ± 4 3 > sin(2t - 6  ) = ± 3 /2 > x = 4cos(2t - 6  ) = ± 4/2 = ± 2 cm  3  1.2.3.4  4 t = 503T  t M4M0  Góc M 4 OM 0 = 30 0 t M4M0 = 12 T       4 3 (cm/s)  2012           t = 503T - 12 T = 12 6035 (s). Chọn đáp án D Câu 32:  1 và  2  2 = 2 1    o .  1  o là? A.  1 = 3 5  0 B.  1 = 5 7  o C.  = 5 16  o D. 7 16  o Câu 33: óng   A. /12; B. /6; C. /4. D. /3; Câu 34:  14 6 C   -   A.  B.  C.  D.  Câu 35:       R = U Lr = 25V; U C  nhiêu? A.  B.  C.  D.  Câu 36:    A. 100(N/m) B. 150(N/m) C. 50(N/m) D. 200(N/m) Câu 37:    A. vàng, tím. B. tím, chàm. C. l D. vàng, chàm. Câu 38: .     2 cos(100Cho R = 80, I = 3 A, U CL = 80 3 V,    RC  CL . Tính L? A. 0,37H B. 0,58H C. 0,68H D. 0,47H Câu 39:      A. 3,2 m/s. B. 5,6 m/s. C. 4,8 m/s. D. 2,4 m/s. F  (N) 2 2 0 4 6 10 14  (cm) 2  O C   M 4 M 3   M 1 M 2   M 0    4  = 18cm,   = 4.18 = 72cm     6  + Trong 1T (2  )     6    = 3  : A B = 2a; A M = 2acos 3  = a         : v Mmax = a + Trong 1                            3 2   smscm T vsT T /4,2/240 3,0 72 )(3,01,0. 2 3 2   : Chọn D Câu 40:   2   A.  B.  C.  D.  Câu 41: -   A.  B.  C. Ra xa thêm 3D/4. D. Ra xa thêm D/3. Câu 42:  m 1 = 2m 2 l 1 = l 2   A.  1  2  B.  C.  D.  2  1  Câu 43:  l    A. /2 . B. 2 . C. 2 . D. 3 . Câu 44:   30 0  3   70 kJ/kg  c = 1535 0  A. 1,16 s B. 2,78 s C. 0,86 s D. 1,56 s GIẢI:   JtPtQ 10  gkgeD d SeDm   3,1210.3,12 4 6 2     0 C lên 1535 0 là:     JttmcQ c 293,8301535.448.10.3,12 6 01    JLmQ 321,3 2   321,3293,810 21  tQQQ  st 16,1 CHỌN ĐÁP ÁN A Câu 45:    ON = 4/3 mét và   A. -6cm; B. 33cm C. 33cm . D. 3cm. Câu 46:   A. 4,6 %. B. 10 %. C. 4,36 %. D. 19 %. GIẢI: 2 11 2 1 W CU  2 22 2 1 W CU Theo bài ra ta có: 19,0 W WW 1 21   %101,09,081,0 2 1 2 1 81,0 W W 1 21 1 2 2 1 2 2 1 2    U UU U U CU CU CHỌN ĐÁP ÁN B Câu 47:  1  2   1  2   A. 0,19. B. 0,1. C. 1,2. D. 0,15. Câu 48:    200 2cos100 ( )u t V     A. 4 2sin(100 )( ) 2 i t A    . B. 4sin(100 )( ) 2 i t A    . C. 4 2 os(100 )( ) 2 i c t A    . D. 4 os(100 )( )i c t A   . Câu 49:  N 14 7    K   X  ban  N = 13,9992u; m p = 1,0073u; m  = 4,0015u. A.  B.  C.  D.  Câu 50:    A.0 B. 3 C. 2 D. 4 Giải:  1 ; BC = d 2  AI = x AM 2  x 2 = BM 2  (AB-x) 2 12 2  x 2 = 5 2  (13-x) 2 > x = 11,08 cm  1   d 1  d 2 = k  d 1 2 = x 2 + IC 2 d 2 2 = (13  x) 2 + IC 2 d 1  N M  C I A B d 2 d 1 2  d 2 2 = x 2 - (13  x) 2 = 119,08 > d 1 + d 2 = k2,1 08,119 (***)  > d 1 = 0,6k + k2,1 54,59  k2,1 54,59   k k 2,1 54,5972,0 2   0,72k 2    >.  và 0,72k 2   > 5,906 < k < 14,09  6 ≤ k ≤ 7 Như vậy có 2 hyperbol cực đại cắt đoạn MN . Chọn đáp án C . ĐỀ ÔN TẬP SỐ 010 Câu 1:    2 .  6 ≤ k ≤ 7 Như vậy có 2 hyperbol cực đại cắt đoạn MN . Chọn đáp án C