C. Vi sau khi bj tan s4c, cac tia dan sic l^i chong chat len nhaụ
Dt ON LUYEN DAI HQC
Ị Phan Chung cho tat ca thi sinh (gom 40 cau):
Cau 1. MQt h^t nhan c6 so khoi la A . Ban dau h^t nhan nay dung yen phong
phat ra h^t a c6 v$n toe v. DQ Ion cua toe h^t nhan con dugc t^o ra trong phong x? nay la A . 4v B. 4v C. 2v D. 2v A + 4 • X A - 4 A + 4 ^ A - 4
Cau 2. D^t vao hai dau nỉich dỉn RLC noi tiep mgt di^n ap xoay chieu u c6 gia trj
hi^u dyng khong doi thi di^n ap hỉu dyng tren cac phan tu R, L va C Ian lugl b k g 60 V; 120 V va 40 V . Khi thay t\ C bSng ty C de di^n ap hỉu dyng hai dau di^n trdr R bSng 100 V , ta thay
A . U C ' = U L ' = 1 2 0 V B . U C ' = U L ' = 40 V
C. u Cling pha UR D . m^ch khong tieu thy cong suat.
Cau 3. H^t nhan nao sau day khi hap thy mpt notron ch|im se phan h^ch ?
A . " ^ U R 234, r B. 92 U c. 'llu r, 2 3 5 T T „ i 2 3 8 x 1
u- Qi U va OT u
92»-J «->• 92'-' 92 92*-" 9 2 ' Cau 4. M$t Trai
A . la thien the duy nhat nong sang. B. la mpt ngoi saọ
C. a trung tarn cua Thien Hạ D. c6 9 hanh tinh quay xung quanh.
Cau 5. Cho m^ch di^n xoay chieu nhu hinh ve, cupn day thuan cam c6 dp ty cam
10^
0,318 H, ty di^n c6 dỉn dung C = Fd$t dỉn ap xoay chieu (220 V ; 50 Hz) vao hai diem:
+ A , B thi i = Iocos(100rtt — ) A
6 + B, C thi i = Iocos(1007rt + j ^ ) A
B Dif n tra R c6 gia trj la