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]
(1)S6 GIAO DUC VA DAO TAO K I T H I CHQN HQC SINH G I O I LOT CAP THANH PHO HA NQI CAC MON KHOA HQC TQ NHIEN NAM HQC 2016 - 2017
B E CHINH THUG Mon: V ^ T L I
Ngay thi: 28/3/2017 Thai gian lam bai: 45phut (De thi gom 04 trang)
Diem Giam khao
Bang so Blng chu Ho va ten Chu ki
1
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 diem) Cau Mot ampe k l co dien trd l,5fi dugc dong dien co cudng ldn nhat
blng 4A Be ampe k l do dugc dong dien co cudng 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 Hinh ben la anh chup mot co gai dang tilp xuc vdi qua cau Van de Graaff Nhung sgi toe cua co day la
A hien tugng nhiem dien cung dlu B hien tugng truyen nhiet C toe bi khd D gid quat thli
Cau Thuc nghi?m cho thly nude da nli clc tan hit thi muc nude coc khong thay dli so vdi mdi tha nude da vao coc Tuy nhien, bang d dia cue cua Trai Bat tan lai lam cho muc nude biin dang cao, gay tham hoa cho moi trudng song Nguyen nhan ciia.su khac biet tren la
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 Khong nong tu may sly toe co rat nhieu hat mang dien tich
duang Su chuyln dong cua cac hat mang dien giong nhu dong dien Khong 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
(2)Cau Mot hang chir dugc dat trade mot guomg phlng nhu hinh ve Anh cua hang chu hien len guong la
Gucmg phing
A CLHAH Y Q U T 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 den Cau 10
Mot phien ban cua dong xe to Ford Fiesta ddi mdi su dung dong ca xang ki tang ap, phun nhien lieu true tiep Bong ca gom xi lanh giong xep thang hang, moi xi lanh co dudng kinh la 71,9mm va hanh trinh pit-tong la 82mm Chu trinh hoat dong cua dong ca gom ki: hut, nen, no, xa; tuang ung vdi vong quay cua true khuyu._ CJ ki no, hln hop xang -khong 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 chuyln dong cua xe va dat gia tri ldn nhat toe cua xe on dinh nam 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 quay ciia true khuyu la 60G0vdng/phut; miic tieu thu xang xe chay noi la 7' ,\Htl\GGkm Gia sir:
- Hieu suat ciia dong ca khong doi
- :Khi xe chay noi thanh, cong suat hoat dong trung binh cua dong ca bang 8% cong suat toi da, toe 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 trung binh dat tdi IQOkm/h
t r *
Biet nang suat toa nhiet cua xang (nhiet lugng toa I kg xang chay het) la 4,6.10 J/kg va khoi lugng rieng cita xang la 71 Okg/m3
Cau Hieu suat ciia dpng ca xe chay noi la
A. 20,7% B.36,1% C.29,1% D.41,4%
Cau Lugng xang tieu ton trung binh 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 Luc can trung binh tac dung len xe xe chay tren dudng cao toe la
A. 14587V B 404,877 C 524977 D 112,477
Cau Khi dpng ca hoat dpng d cong suat cue dai, ap suat trung binh tac dung len pit-tong 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 noi 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 mpt nam la
A. 1677/7 B 122/7/ C 147/if D 113///
(3)Phan 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:
- Neu dat vat d A thi vi tri anh d B. B A C
- 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.)
(4)Bai 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 md ca hai khoa K i va K2 thi mach dien tieu thu cong suat la bao nhieu ?
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