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11-sinf fizika test
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| Sana | 21.12.2023 | | Hajmi | 24,8 Kb. | | #126136 |
Bog'liq 11-sinf fizika olimpiada uchun
11-sinf fizika test
1. Protondan 5∙10-11 m masofadagi elektr maydonning kuchlanganligini hisoblang.
A) ~5,8∙10-11 B/m B) ~4,9∙10-11 B/m C) ~3,7∙10-11 B/m D) ~5,7∙10-11 B/m
2. Agar tezlashtiruvchi kuchlanish 15 kV gat eng bo’lsa, kineskop trubkasidagi electron qanday kinetik energiyaga ega bo’ladi?
A) 3,4∙10-16 J B) 2,4∙10-16 J C) 4,2∙10-16 J D) 0,5∙10-16 J
3. Kondensator plastinalari orasidagi kuchlanish 220 V bo’lganda plastinalardagi turli turli ismli zaryadlar 10-4 Kl ga teng. Kondensatorning elektr sig’imi nimaga teng?
A) 0,1 mkf B) 0,3 mkf C) 0,4 mkf D) 0,5 mkf
4. Elektr sig’imi 10 mkf va 10 V kuchlanishgacha zaryadlangan kondensatorning elektr maydonining energiyasini hisoblang.
A) 5∙10-4 J B) 3∙10-4 J C) 4∙10-4 J D) 7∙10-4 J
5. Matematik mayatnikning tebranishlari davri 3 marta kamayishi uchun mayatnikning uzunligini necha marta kamaytirish kerak?
A) 7 marta B) 9 marta C) 11 marta D) 13 marta
6. Havoda chastotasi 2000 Gts bo’lganda tovush to’lqinining uzunligini toping. Havoda tovushning tezligi 343 m/s.
A) ~0,17 m B) ~0,15 m C) ~0,13 m D) ~0,11 m
7. Kondensatorning elektr sig’imi 2 marta ortganda elektr konturidagi erkin tebranishlar davri qanday o’zgardi?
A) marta ortadi B) C) D)
8. Chaqmoq chaqqandan so’ng 6 s o’tgach, momaqaldiroq gumburladi. Yashin razryad kuzatuvchidan qanday masofada bo’lgan?
A) ~5 km B) ~4 km C) ~3 km D) ~3 km
9. G’altakning induktivligi 4 marta kamaytirilganda elektr konturidagi erkin tebranishlar chastotasi qanday o’zgaradi?
A) 2 marta B) 3 marta C) 4 marta D) 5 marta
10. Agar linzadan buyumgacha masofa 40 sm bo’lganda haqiqiy tasvir linzadan 2 m masofada hosil bo’lsa, linzaning fokus masofasini aniqlang.
A) 0,5 m B) 0,3 m C) 0,4 m D) 0,7 m
11. 220 V kuchlanishli o’zgaruvchan tok zanjirga ulangan cho’lg’anma elektr lampaning aktiv qarshiligini toping. Bunda o’rtacha 100 Vt quvvat ajraladi.
A) 484 Om B) 472 Om C) 487 Om D) 354 Om
12. Venera uchun birinchi kosmik tezlikni aniqlang. Veneraning massasi 4,87∙1024 kg, radiusi 6,05∙106 m.
A) ~7,33 km/s B) -7,31 km/s C) -7,29 km/s D) ~7,38 km/s
13. 3000 ayl/min aylanish chastotasida 0,3 diametrli kir yuvish mashinasi sentrifigurasidagi kir qanday “Yuklanishda” bo’ladi?
A) -1 soat∙25min5∙102 s B) ~1 soat∙23min5∙103 s C) ~1 soat∙20min5∙102 s
D) ~1 soat∙25min5∙103 s
14. 20 kg massali raketadan 1 kg massali yonilg’i yonish maxsulotlari 2 km/s tezlik bilan ortilib chiqqandan so’ng u taxminan qanday tezlik bilan harakatlanadi?
A) ~105 m/s B) ~107 m/s C) ~109 m/s D) ~111 m/s
15. Raketa gazlarining chiqish tezligi 3,5 km/s bo’lganda 2000 kg/s yonilg’i sarflayotgan dvigatelning tortish kuchini aniqlang.
A) 7∙108 H B) 7∙106 H C) 8∙103 H D) 7∙106 H
Javoblar
9. А
10. B
11. A
12. A
13. B
14. A
15. B
16. A
А
B
D
A
В
A
C
D
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