8-sinf Fizika Olimpiada


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8-sinf olimp 66


8-sinf Fizika Olimpiada
1 . Tok kuchini hisoblash formulasini aniqlang .
A) U=A/q B) I= q/t C) C=C1+C2 D) E=F/q0
2. Tok kuchini o’lchash uchun qaysi asbobdan foydalaniladi ?
A) Dinamometr B) Ampermetr C) Voltmetr D) Elektrometr
3. Eng kichik ( elementar ) zaryad miqdori nimaga teng ( C ) ?
A) 1,9∙10-16B) 1,6 ∙ 10-19 С)1,6 ∙1019 D) 9 ∙ 10-31
4. Quyidagi zarralarning qaysi biri manfiy zaryadga ega ?
A) Elektron B) Proton C) Neytron D) Yadro
5. 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
6. Kulon qonuni formulasini belgilang
A) F = kq B) F = k  C) F = ma D) E = F/q0
7. 400 mA necha A ga teng ?
A) 0, 004 B) 400 C) 4 D) 0,4
8. 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
9. 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
10. Elektr tokining o’lchov birligini belgilang ?
A) volt ( V ) B) Amper (A) C) Joul ( J ) D) Kulon ( C )
11. Elektr maydonining tarqalish tezligi qachaga teng ?
A) 300 000 km/s B) aniqlanmagan C) tezlikka ega emas D) 30 km/s
12. 0,22 kV kuchlanish necha Voltga teng?
A) 0,22 V B) 22 V C) 2200 V D) 220 V
13. Zaryadlangan o'tkazgichda zaryadlar qanday taqsimlanadi ?
A) O'tkazgichning butun hajmi bo'ylab tekis B) O'tkazgichning butun sirti bo’ylab tekis C) O'tkazgichning markazida D) O'tkazgichning shakliga bog'liq holda, uning sirtida notekis

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