26.Qattiq jismlar molekulalari qanday harakat qiladi ?
A) harakat qilmaydi B) ilgarilanma C) tebranma D) aylanma
27. 0,25 kg massani grammlarda ifodalang
A) 25 B) 250 C) 25 D) 0,25
28. O’lchamlari 5 m x 4 m x 2,5 m bo’lgan xonadagi havo massasini hisoblang. Havoning zichligi 1,3 kg/m3.
A) 65 kg B) 6,5 kg C) 37,5 kg D) 65 g
29.90 minut necha sekundga teng ?
A) 5 400 B) 4 500 C) 3 600 D) 1 800
30.Yo'lning asosiy o’lchov birligini aniqlang.
A) km B) sm C) dm D) m
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8-sinf Fizika Al-Xorazmiy I-tur maktab bosqichi.
1. “ Energiya ” so’zinin ozbekcha ma’nosini aniqlang
A) harakat B) imkoniyat C) faollik D) turtki
2. Impulsi 2,7kg ∙ m/sbo’lgan koptokning massasi 0,3 kg bo’lsa, uning tezligi nimaga teng ?
A) 9 m/s B) 0,7 m/s C) 14 m/s D) 10,9 m/s
3. Gapni to’ldiring: “ Kuchning shu kuch yo’nalishida jism bosib o’tgan yo’l bilan ko’paytmasi .... deb ataladi. ”
A) ... potensial energiya ... B) ...kinetik energiya ... C) ... mexanik ish ... D) ... quvvat ...
4. Jism yuqoriga ko’tarilishda kinetik energiyasi qanday o’zgaradi ?
A) ortadi B) kamayadi C) o’zgarmaydi D) avval ortib keyin o’zgarmaydi
5. Massasi 2 kg bo’lgan jismning 6 m balandlikdagi potensial energiyasi qanchaga teng (g=10 m/s2 ) ?
A) 240 J B) 32 J C) 9,8 J D) 120 J
6. Biror jism h balandlikda tinch turibdi. U Yerga tushayotganda qaysi energiyasi ortadi ?
A) to’liq mexanik energiyasi B) potensial energiyasi
C) kinetik energiyasi D) biror turdagi energiyasi ortmaydi.
7. To’liq mexanik energiya formulasi qaysi javobda to’g’ri yozilgan ?
I. E=mgh II. E=mv2/2 III. E=kx2/2 IV. E=Ek+Ep
A) IV. B) I, II, III, IV . C) III, IV. D) I. II
8. 100 kW necha W ga teng ?
A) 10 6 B) 10 7 C) 10 - 5 D) 10 5
9. Quvvatni hisoblash formulasini belgilang .
A) A=Nt B) N=A/t C) A=FS D) η= Af /At
10. 1 kW∙soat necha Jga teng ?
A)103 B) 3,6 ∙106 C)3,6 ∙105D) 36∙106
11 . Tok kuchini husoblash formulasini aniqlang .
A) U=A/q B) I= q/t C) C=C1+C2 D) E=F/q0
12. Kuchlanishni o’lchash uchun qaysi asbobdan foydalaniladi ?
A) Dinamometr B) Ampermetr C) Voltmetr D) Elektrometr
13. Eng kichik ( elementar ) zaryad miqdori nimaga teng ( C ) ?
A) 1,9∙10-16B) 1,6 ∙ 10-19С)1,6 ∙1019 D) 9 ∙ 10-31
14. Quyidagi zarralarning qaysi biri manfiy zaryadga ega ?
1.Elektron 2.Proton 3.Neytron 4.Yadro
A) 1 B) 2 C) 3 D) 4
15. Gapni to'ldiring: "Zaryadli zarralarning o'tkazgich bo'ylab ozgarmas miqdordagi oqimi ….. deb atatladi."
A) o'zgarmas tok B) elekt toki C) o'zgaruvchan tok D) elektr zaryadi
16. Kulon qonuni formulasini belgilang
A) F = k B) F = k C) F = G D) E = F/q0
17. 400 mA necha A ga teng ?
A) 0, 004 B) 400 C) 4 D) 0,4
18. Eng sodda elektr zanjiri tarkibiga quyidagilardan qaysilari kiradi ?:
1. Tok manbai 2.O’tkazgich 3. Elektr iste’molchi 4. Kalit
A) 1, 3, 4 B) 2, 3, 4 C) 1, 2, 4 D) 1, 2, 3, 4
19. Metallarda elektr tokini qanday zarralarning hosil qiladi ?
A) Musbat ionlar B) Musbat ionlar va erkin elektronlar
C) Elektr maydoni ta’sirida erkin elektronlarning harakati
D) Atom yadrolarining harakati
20. Elektr sig’imining o’lchov birligini belgilang ?
A) volt ( V ) B) Farad ( F ) C) Joul ( J ) D) Kulon ( C )
21. Rеzistor qanday asbob?
A) Kattaligi o`zgaradigan qarshilik. B) Aniq qarshilikka ega bo`lgan radiodеtal.
C) Zanjirdagi kuchlanishni o'zgartiradigan asbob. D) Qarshilikni o`lchovchi asbob.
22. Qarshiligi 8 Ω va 10 Ω bo`lgan o`tkazgichlar ketma-ket ulangan. Umumiy qarshilik nimaga tеng?
A) 18 Ω B) 2 Ω C) 9 Ω D)4,4 Ω
23. 3 tа o`tkаzgich kеtmа-kеt ulаngаndа zаnjirdаgi umumiy tоk kuchi qаndаy bo`lаdi ?
А) I=I1=I2 =I3 B) ) I=I1=I2 +I3 C) ) I=I1+I2 =I3 D) ) I=I1I2 I3
24.Qаrshiligi 1200 bo’lgan vоltmеtr 10 V ni ko`rsаtib turgаn vаqtdа undаn o`tаyotgаn tоk kuchini tоping.
A) 0,0083 A B) 0,083 A C) 120 A D) 12 A
25.Lаmpа qisqichlаridаgi kuchlаnish 120 V bo`lgаndа lаmpа оrqаli 0,5 А bо`lgаn tоk о`tаdi. Lаmpаning qаrshiligini аniqlаng .
A) 600 B) 24 С) 60 D) 240
26.Аmpеrmеtr zаnjirgа qаndаy ulаnаdi ?
А) Pаrаllеl ulаnаdi B) Kеtmа-kеt ulаnаdi C) Aralash ulаnаdi
D) Elektr chizmasiga qarab pаrаllеl yoki kеtmа-kеt ulаnаdi
27. kW·h qanday kattalikning o'lchov birligi ?
A) tokning quvvati B) tok kuchi
C) elektr qarshilik D) sarflangan elektr energiyasi
28.Zanjirdagi ( rasmga qarang ) voltmеtr nimani ko`rsatadi ? O'tkazgichdagi tokning quvvati necha W ga teng ?
A) 5 V; 20 W B) 7 V ; 0,8 W C) 10 V; 20 W D) 3 V; 10 W
29.Tokning bajargan ishi qaysi asbob yordamida hisoblanadi ?
A) voltmeter B) galvanometr C) hisoblagich D) vattmetr
30. P=IU formuladan qanday fizik kattalik aniqlanadi?
A) Tokning ishi B) Kuchlanish C) Tokning quvvati D) Tok kuchi
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