11-sinf Fizika olimpiada №2 Iyul 18, 2022Iyul 18, 2022 da chop etilgan InfoMaster tomonidan 11-sinf Fizika olimpiada №2 ga 12 fikr bildirilgan 0 12345678910111213141516171819202122232425 11-sinf Fizika olimpiada №2 2019-yil tuman bosqichida tushgan savollar 1 / 25 1. 40 m balandlikdan gorizontga 30° burchak ostida jism 20 m/s tezlik bilan uloqtirilsa, yerga qancha vaqtda (s) tushadi? A) 5 B) 4 C) 3 D) 12 2 / 25 2. Jism biror balandlikdan boshlang’ich tezlik bilan gorizontal otildi. Biror vaqt momentida tezlik vektori gorizont bilan hosil qilgan burchagining tangensi 2√3 ga teng bo’lsa, shu vaqt momentida ko’chish vektorining gorizont bilan hosil qilgan burchagi kosinusining ikkilangan qiymatini toping. A) 2 B) 3 C) 1 D) 5 3 / 25 3. Idishdagi gazning hajmi o‘zgarmas temperaturada 5% ga kamayishi uchun gaz bosimini necha foizga orttirish kerak? A) 10 B) 4,9 C) 5,3 D) 7 4 / 25 4. Aylanma harakat qilayotgan g’ildirak gardishi nuqtasining υ1 chiziqli tezligi gardishdan o’qqa 5 sm yaqin bo’lgan nuqtasining υ2 chiziqli tezligidan 2,5 marta katta bo’lsa, g’ildirakning radiusi topilsin. (cm) A) 8,3 B) 5 C) 4,16 D) 6 5 / 25 5. R radiusli metal shar bir jinsli hajmiy zaryadga ega. Quyidagi qaysi grafik sharning elektr maydon kuchlanganligining masofaga bog’liqligini ifodalaydi? A) II B) III C) I D) IV 6 / 25 6. Metropoliten ikki stansiyasining oralig’i 1,5 km. Poyezd bu masofaning birinchi yarmida tekis tezlanuvchan, qolgan ikkinchi yarmida tekis sekinlanuvchan harakat qiladi. Poyezdning maksimal tezligi 50 km/soat ga teng. Bu tezlanuvchan va sekinlanuvchan harakatning tezlanishlarini modul jihatdan teng bo`lsa,poyezdning ikki stansiya orasidagi harakat vaqti topilsin.(min) A) 1,8 B) 3,6 C) 108 D) 10,8 7 / 25 7. Bir xil temperaturada turgan geliy (v₁), neon (v₂ ) va argon (v₃) gazlari atomlarining issiqlik harakati o‘rtacha kvadratik tezliklarini taqqoslang. Ularning nisbiy atom massalari quyidagicha: geliyniki - 4 m.a.b., neonniki - 20 m.a.b. va argonniki - 40 m.a.b. A) v₁=√5v₂=√10v₃ B) aniqlab bo’lmaydi C) v₁=v₂/√5=v₃/√10 D) v₁=v₂=v₃ 8 / 25 8. A jism υ1 boshlang’ich tezlik bilan yuqoriga otilgan vaqtda, h balandlikdan υ2=0 boshlang’ich tezlik bilan B jism pastga tushib keladi. Agar jismlar bir vaqtda harakatlangan bo’lsa, A va B jismlar orasidagi x masofaning t vaqtga bog’lanishi topilsin. A) l=h-(gt²)/2 B) l=v₀t-(gt²)/2 C) l=h-v₀t D) l=2v₀t-gt² 9 / 25 9. Tosh gorizontal yo'nalishda 10 m/sek tezlik bilan otilgandan 3 sek o'tgach, tosh trayektoriyasining egrilik radiusi topilsin. Havoning qarshiligi hisobga olinmasin. A) 58,6 B) 305 C) 196 D) 30 10 / 25 10. Bir atomli 1 mol gaz izobarik kengayganda160 J ish bajaradi va temperaturasi 100C gaortadi. Gazga qancha issiqlik miqdori (J)berilgan? A) 84 B) 124 C) 160 D) 284 11 / 25 11. 5 sm radiusli va 104 V potensialgacha zaryadlangan shar radiusi 3 sm li zaryadsiz shar bilan sim orqali tutashtirilgandan keyin sharlar potensiallari hisoblab topilsin. A) 65 V B) 82 V C) 75 V D) 62,5 V 12 / 25 12. Mutlaq silliq stolda M=10 kg massali taxta, taxtada esa m=4 kg massali taxtacha yotibdi. Taxta va taxtacha orasidagi ishqalanish koeffitsiyenti μ=0,2. Taxtachaga F=10 N gorizontal kuch qo‘yilgan. Taxta qanday tezlanish (m/s2) bilan harakatlanishini aniqlang. A) 0,2 B) 0,4 C) 1,2 D) 0,8 13 / 25 13. Bo`ylama to`lqinda muhit zarrachalari qanday yo`nalishda tebranadilar? A) To`lqin tarqalishiga burchak ostida. B) To`lqin tarqalishiga perpendikulyar yo`nalishda. C) To`lqin tarqalishi yo`nalishida. D) To`lqin tarqalishiga teskari. 14 / 25 14. Ikkita bir xil spiral 5 V li o’zgarmas kuchlanish tarmog’iga ketma-ket ulangan. Agar birinchi spiralning uzunligi 1,5 marta qisqartirilsa, uning uchlaridagi potensiallar farqi necha voltga teng bo’ladi? A) 3 B) 6 C) 5 D) 4 15 / 25 15. Quyidagi moddalardan qaysi birining elektr o’tkazuvchanligi eng kichik? A) yarim o’tkazgichlar B) dielektriklar C) elektrolitlar D) metallar 16 / 25 16. Jism h=19,6 m balandlikdan boshlang’ich tezliksiz tushmoqda. Jism o'z harakatining oxirgi 0,1 sekundda qanch yo`l o`tadi? Havoning qarshiligi hisobga olinmasin. A) 1,9 B) 9,8 C) 20 D) 6,87 17 / 25 17. Kir yuvish mashinasining 40 sm diametrli bakiga sovunli suv quyilgan (σ=40 MN/m). Bu suv sirt qatlamining energiyasini aniqlang.(mJ) A) 1 B) 50 C) 10 D) 5 18 / 25 18. 0,02 lm yorug’lik oqimi yuzi 5 sm2 bo’lgan sirtga perpendikular tushmoqda. Sirtning yoritilganligi qanday? A) 45 lx B) 42 lx C) 40 lx D) 50 lx 19 / 25 19. Oydagi portlash yerda eshitlishi mumkinki? A) portlash intensivligiga bog’lik B) aniqlab bo’lmaydi C) eshitiladi D) eshitilmaydi 20 / 25 20. O’zgarmas tok manbaiga ulangan yassi kondensator plastinkalari orasidagi masofa 2 marta kamaytirilsa, elektr maydon energiyasi o’zgaradimi? A) 2 marda oshadi B) √2 marta ortadi C) √2 marta kamaydi D) o’zgarmaydi 21 / 25 21. Tekis harakatlanib tushayotgan aerostat xuddi shunday tezlikda yuqoriga ko'tarila boshlashi uchun, aerostatdan qancha og’irlikdagi ballastni (yukni) tashlab yuborish kerak?(kg) Aerostatning ballast bilan birga og’irligi 16 kN, yuqoriga ko'rsatuvchi kuchi 12 kN. Yuqoriga ko'tarilishda va tushishida havoning qarshilik kuchi birday hisoblansin. A) 600 B) 485 C) 800 D) 350 22 / 25 22. Zaryadlangan shar sirtidan uning radiusiga teng masofaga uzoqlashilsa, elektr maydon potensiali qanday o’zgaradi? A) o’zgarmaydi B) 2 marta kamayadi C) 2 marta ortadi D) 4 marta ortadi 23 / 25 23. υ=600 m/sek tezlik bilan uchayotgan m=4,65·10-26 kg massali molekula normalga nisbatan idish devoriga 600 burchakda uriladi va shunday burchakda tezligini o'zgartmay elastik qaytadi. Urilish vaqtida idish devoriga berilgan kuch impulsi topilsin A) 2,8∙ 10⁻²³ B) 1,4∙ 10⁻²³ C) 10⁻²³ D) 0 24 / 25 24. Oyning siderik davri qancha? A) 21,32 sutka. B) 27,32 sutka. C) 29,32 sutka. D) 22,32 sutka. 25 / 25 25. Doimiy tok manbaiga ulangan yassi havo kondensatorining plastinkalari orasi dielektrik singdiruvchanligi Ԑ=10 bo`lgan muhit bilan to`ldirildi. Bunda plastinkalar orasidagi ta’sir kuchi qanday o`zgaradi? A) 10 marta ortadi. B) 100 marta ortadi. C) 10 marta kamayadi. D) 100 marta kamayadi. 0% Testni qayta ishga tushiring Author: InfoMaster Fizika olimpiada
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