11-sinf Fizika olimpiada №2 Iyul 18, 2022Avgust 19, 2024 da chop etilgan InfoMaster tomonidan 11-sinf Fizika olimpiada №2 ga 13 fikr bildirilgan 0 12345678910111213141516171819202122232425 Tomonidan yaratilgan InfoMaster 11-sinf Fizika olimpiada №2 2019-yil tuman bosqichida tushgan savollar 1 / 25 1. Bir jinsli kubning tomoni 2 m ga teng. Agar kubdan rasmda ko’rsatilgandek qilib tomoni 1 m ga teng bo’lgan kubsimon qismi ajratib olinsa, kubning massa markazi necha sm ga siljishini toping. √3 ≈ 1,73 A) 14.51 B) 18.42 C) 12.36 D) 15 2 / 25 2. Ikki jism biror A nuqtadan bir xil tezlik bilan o’zaro qarama – qarshi yo’nalishda harakat boshlaganlaridan so’ng bir daqiqa o’tgach ular orasidagi masofa 200 m bo’ldi. Agar shu ikki jism huddi shu nuqtadan ammo bir xil yo’nalishda harakatlansalar, harakat boshlangandan 2 daqiqadan so’ng ularning orasidagi masofa necha metr bo’ladi? A) 400 B) 200 C) 0 D) 100 3 / 25 3. 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) 10⁻²³ C) 0 D) 1,4∙ 10⁻²³ 4 / 25 4. Bir atomli 1 mol gaz izobarik kengayganda160 J ish bajaradi va temperaturasi 100C gaortadi. Gazga qancha issiqlik miqdori (J)berilgan? A) 160 B) 284 C) 124 D) 84 5 / 25 5. 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) 350 D) 800 6 / 25 6. Shishadan fokus masofasi 20 sm bo‘lgan qavariqlinza tayyorlandi. Linzaning egrilik radiuslariteng. Shishaning nur sindirish ko‘rsatkichi 1,5ga teng bo‘lsa egrilik radiusini (sm) toping. A) 22 B) 24 C) 25 D) 20 7 / 25 7. Zaryadlangan shar sirtidan uning radiusiga teng masofaga uzoqlashilsa, elektr maydon potensiali qanday o’zgaradi? A) 4 marta ortadi B) 2 marta ortadi C) 2 marta kamayadi D) o’zgarmaydi 8 / 25 8. 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=v₂=v₃ B) aniqlab bo’lmaydi C) v₁=√5v₂=√10v₃ D) v₁=v₂/√5=v₃/√10 9 / 25 9. 0,02 lm yorug’lik oqimi yuzi 5 sm2 bo’lgan sirtga perpendikular tushmoqda. Sirtning yoritilganligi qanday? A) 45 lx B) 40 lx C) 42 lx D) 50 lx 10 / 25 10. 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) 6 D) 4,16 11 / 25 11. Bo`ylama to`lqinda muhit zarrachalari qanday yo`nalishda tebranadilar? A) To`lqin tarqalishiga perpendikulyar yo`nalishda. B) To`lqin tarqalishi yo`nalishida. C) To`lqin tarqalishiga burchak ostida. D) To`lqin tarqalishiga teskari. 12 / 25 12. Oyning siderik davri qancha? A) 22,32 sutka. B) 21,32 sutka. C) 29,32 sutka. D) 27,32 sutka. 13 / 25 13. 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 14 / 25 14. Gaz PV²=const tenglamaga muvofiq siqilmoqda. Bunda uning temperaturasi qanday o‘zgaradi? A) pasayadi B) javob konstantaning qiymatiga bog‘liq C) ko‘tariladi D) o‘zgarmaydi 15 / 25 15. 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) 108 B) 1,8 C) 3,6 D) 10,8 16 / 25 16. Quyidagi moddalardan qaysi birining elektr o’tkazuvchanligi eng kichik? A) metallar B) dielektriklar C) yarim o’tkazgichlar D) elektrolitlar 17 / 25 17. 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=h-v₀t C) l=v₀t-(gt²)/2 D) l=2v₀t-gt² 18 / 25 18. O’zgarmas tok manbaiga ulangan yassi kondensator plastinkalari orasidagi masofa 2 marta kamaytirilsa, elektr maydon energiyasi o’zgaradimi? A) √2 marta kamaydi B) o’zgarmaydi C) 2 marda oshadi D) √2 marta ortadi 19 / 25 19. 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 20 / 25 20. Kir yuvish mashinasining 40 sm diametrli bakiga sovunli suv quyilgan (σ=40 MN/m). Bu suv sirt qatlamining energiyasini aniqlang.(mJ) A) 50 B) 1 C) 5 D) 10 21 / 25 21. Idishdagi gazning hajmi o‘zgarmas temperaturada 5% ga kamayishi uchun gaz bosimini necha foizga orttirish kerak? A) 4,9 B) 10 C) 7 D) 5,3 22 / 25 22. 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) 6,87 B) 9,8 C) 1,9 D) 20 23 / 25 23. Oydagi portlash yerda eshitlishi mumkinki? A) portlash intensivligiga bog’lik B) aniqlab bo’lmaydi C) eshitilmaydi D) eshitiladi 24 / 25 24. 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) 62,5 V B) 75 V C) 65 V D) 82 V 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) 100 marta kamayadi. B) 100 marta ortadi. C) 10 marta kamayadi. D) 10 marta ortadi. 0% Testni qayta ishga tushiring Author: InfoMaster Fizika olimpiada, Tuman 2019-2020 o'quv yili
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