Nha san xuat xe cong bo: cong suat cue dai cua dong ca la 93,1 kW dat dugc tai toe do quay ciia true khuyu la 60G0vdng/phut; miic tieu thu xang khi xe chay trong noi thanh la 7 ' ,\Htl[r]
Trang 1S6 GIAO DUC VA DAO TAO K I T H I CHQN HQC SINH G I O I LOT 9 CAP THANH PHO
HA NQI CAC MON KHOA HQC TQ NHIEN NAM HQC 2016 - 2017
Ngay thi: 28/3/2017 Thai gian lam bai: 45phut (De thi gom 04 trang)
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Thi sinh lam bai true tiep veto de thi
Can bo coi thi khong giai thich gi them
PHACH
Phan I Trac nghifm
Thi sinh khoanh tron vao mpt lya chpn dung voi moi cau (Moi lira chon dung dugc 1 diem)
Cau 1 Mot ampe k l co dien trd l,5fi do dugc dong dien co cudng do ldn nhat
blng 4A Be ampe k l do do dugc dong dien co cudng do ldn nhat \0A thi phai
mlc song song no vdi dien trd co gia tri bang
A 0,20 B lO C 2Q D 0,10
Cau 2 Hinh ben la anh chup mot co gai dang tilp xuc vdi qua cau Van de
Graaff Nhung sgi toe cua co day nhau la do
A hien tugng nhiem dien cung dlu B hien tugng truyen nhiet
C toe bi khd D gid quat thli
Cau 3 Thuc nghi?m cho thly nude da nli trong clc tan hit thi muc nude trong coc khong thay dli so vdi khi mdi tha nude da vao coc Tuy nhien, khi bang d dia cue cua Trai Bat tan ra lai lam cho muc nude biin dang cao, gay tham hoa cho moi trudng song Nguyen nhan ciia.su khac biet tren la do
A bang d dia cue nlm tren luc dia
B bang d dia cue nlm gitia dai duang
C khli lugng rieng ciia bang d cac dia cue ldn han khoi lugng rieng cua nude da thong thudng
D khli lugng rieng cua bang d cac dia cue nho han khli lugng rieng ciia nude da thong thudng Cau 4 Khong khi nong tu may sly toe co rat nhieu hat mang dien tich
duang Su chuyln dong cua cac hat mang dien nay giong nhu dong dien
Khong khi nong dugc thli qua khoang gitia hai cue cua mot nam cham
manh nhu hinh ve Cac hat mang dien se bi lech
A len tren B ve phia cue nam S
C xulng dudi D ve phia cue blc N
Trang 2Cau 5 Mot hang chir dugc dat trade mot guomg phlng nhu hinh ve Anh cua hang chu hien len trong guong la
Gucmg phing
A CLHAH Y Q U T 2 B 2JLX1DA HVKD c cravH A O T L I S D SlflDAHVHD
Dfv kien du&i day dugc su dung cho cac can hoi tu Can 6 den Cau 10
Mot phien ban cua dong xe 6 to Ford Fiesta ddi mdi su dung dong ca xang 4 ki tang ap, phun nhien lieu true tiep Bong ca nay gom 3 xi lanh giong nhau xep thang hang, moi xi lanh co
dudng kinh trong la 71,9mm va hanh trinh pit-tong la 82mm Chu trinh hoat dong cua dong ca
gom 4 ki: hut, nen, no, xa; tuang ung vdi 2 vong quay cua true khuyu._ CJ ki no, hln hop xang -khong khi bi dot chay, gian nd, sinh cong day pit-tong di het mot hanh trinh Khi xe hoat dong, hieu suit cua dong ca thay doi theo tic do chuyln dong cua xe va dat gia tri ldn nhat khi toe do
cua xe on dinh nam trong khoang tir lOkm/h tdi \\Glan/h Nha san xuat xe cong bo: cong suat cue dai cua dong ca la 93,1 kW dat dugc tai toe do quay ciia true khuyu la 60G0vdng/phut; miic tieu thu xang khi xe chay trong noi thanh la 7' ,\Htl\GGkm Gia sir:
- Hieu suat ciia dong ca khong doi
- :Khi xe chay trong noi thanh, cong suat hoat dong trung binh cua dong ca bang 8% cong
suat toi da, toe do trung binh dat 40km/h
- Khi xe chay tren dudng cao toe, cong suat hoat dong trung binh ciia dong ca bang 12%
cong suat toi da, toe do trung binh dat tdi IQOkm/h
Biet nang suat toa nhiet cua xang (nhiet lugng toa ra khi I kg xang chay het) la 4,6.10 J/kg va khoi lugng rieng cita xang la 71 Okg/m 3
Cau 6 Hieu suat ciia dpng ca khi xe chay trong noi thanh la
A 20,7% B.36,1% C.29,1% D.41,4%
Cau 7 Lugng xang tieu ton trung binh khi xe chay lOQkm tren dudng cao toe la
k 3,21 lit B.5,42/fr C 8,52/z'f D 4,26/fr
Cau 8 Luc can trung binh tac dung len xe khi xe chay tren dudng cao toe la
A 14587V B 404,877 C 524977 D 112,477
Cau 9 Khi dpng ca hoat dpng d cong suat cue dai, ap suat trung binh tac dung len pit-tong trong
ki no la
A l,88.106Pa B 5,64.106Pa C l,41.106Pa D 0,47.106Pa
Cau 10 Bong ca thudng (khong tang ap) co hieu suat thlp han khoang 5% so vdi hieu suat cua dpng ca tang ap Chiec xe tren thudng chay khoang lOOOOkm/nam trong noi thanh Lugng xang
tiet kiem dugc neu su dung loai xe dung dpng ca tang ap tren thay vi sii dung loai xe dung dpng
ca thudng trong mpt nam la
A 1677/7 B 122/7/ C 147/if D 113///
Trang 3Phan I I Tir luan
Thi sinh trinh bay van tat loi giai
Bai 1 (5 diem)
Tren hinh ve, xy la true chinh cua mot thau kinh hot tu mong Ba diim A, B, C thoa man:
- Nlu dat vat d B thi vi tri anh d C
Biet AB = 20cm; AC = 40cm Tim vi tri dat thau kinh va tieu cu cua thlu kinh
(Thi sinh dugc su dung cong thuc thau kinh.)
Trang 4Bai 2 (5 diem)
Cho mach dien nhu hinh ve, cac dien trd va hieu dien the U
co gia tri xac dinh, day noi va khoa K co dien trd khong dang ke
- Khi Ki dong, K2 md thi mach dien tieu thu cong suat la 6JK;
- Khi K2 dong, Ki md thi mach dien tieu thu cong suat la 2W\
- Khi dong ca hai khoa Ki va K2 thi mach dien tieu thu cong suat
la WW
Hoi khi md ca hai khoa K i va K2 thi mach dien tieu thu cong suat la bao nhieu ?
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