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. Boshlang’ich tezliksiz erkin tushayotgan jism harakatining oxirgi 4 sekunddida 120 m masofani bosib o’tdi. Jismning yerdan 45m balandlikdagi tezligi (m/s) topilsin. g=10 m/s^2 A) 40 B) 60 C) 50 D) 10 2 / 25 2. Chizmada ko’rsatilgan sxemada A va B nuqtalar orasidagi kuchlanish 180 V ga teng bo’lsa, V –voltmeter necha V ko’rsatishini aniqlang. A) 30 B) 25 C) 40 D) 20 3 / 25 3. 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) 82 V B) 62,5 V C) 75 V D) 65 V 4 / 25 4. 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. 5 / 25 5. 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) 10 D) 5 6 / 25 6. Oyning siderik davri qancha? A) 21,32 sutka. B) 22,32 sutka. C) 29,32 sutka. D) 27,32 sutka. 7 / 25 7. Bir atomli 1 mol gaz izobarik kengayganda160 J ish bajaradi va temperaturasi 100C gaortadi. Gazga qancha issiqlik miqdori (J)berilgan? A) 160 B) 124 C) 284 D) 84 8 / 25 8. 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) 20 B) 9,8 C) 6,87 D) 1,9 9 / 25 9. 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) 350 B) 600 C) 485 D) 800 10 / 25 10. Bo`ylama to`lqinda muhit zarrachalari qanday yo`nalishda tebranadilar? A) To`lqin tarqalishi yo`nalishida. B) To`lqin tarqalishiga perpendikulyar yo`nalishda. C) To`lqin tarqalishiga teskari. D) To`lqin tarqalishiga burchak ostida. 11 / 25 11. 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 kamaydi C) o’zgarmaydi D) √2 marta ortadi 12 / 25 12. Tosh gorizontal yo'nalishda 10 m/sek tezlik bilan otilgandan 3 sek o'tgach, tosh trayektoriyasining egrilik radiusi topilsin. Havoning qarshiligi hisobga olinmasin. A) 30 B) 58,6 C) 196 D) 305 13 / 25 13. 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) 24 B) 22 C) 25 D) 20 14 / 25 14. Quyidagi moddalardan qaysi birining elektr o’tkazuvchanligi eng kichik? A) elektrolitlar B) dielektriklar C) yarim o’tkazgichlar D) metallar 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) 3,6 C) 1,8 D) 10,8 16 / 25 16. Idishdagi gazning hajmi o‘zgarmas temperaturada 5% ga kamayishi uchun gaz bosimini necha foizga orttirish kerak? A) 4,9 B) 5,3 C) 7 D) 10 17 / 25 17. Oydagi portlash yerda eshitlishi mumkinki? A) eshitiladi B) aniqlab bo’lmaydi C) portlash intensivligiga bog’lik D) eshitilmaydi 18 / 25 18. 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) 6 B) 4 C) 3 D) 5 19 / 25 19. 0,02 lm yorug’lik oqimi yuzi 5 sm2 bo’lgan sirtga perpendikular tushmoqda. Sirtning yoritilganligi qanday? A) 50 lx B) 40 lx C) 42 lx D) 45 lx 20 / 25 20. 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) 1,4∙ 10⁻²³ B) 2,8∙ 10⁻²³ C) 10⁻²³ D) 0 21 / 25 21. Gaz PV²=const tenglamaga muvofiq siqilmoqda. Bunda uning temperaturasi qanday o‘zgaradi? A) javob konstantaning qiymatiga bog‘liq B) o‘zgarmaydi C) pasayadi D) ko‘tariladi 22 / 25 22. 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) 4,16 C) 5 D) 6 23 / 25 23. R radiusli metal shar bir jinsli hajmiy zaryadga ega. Quyidagi qaysi grafik sharning elektr maydon kuchlanganligining masofaga bog’liqligini ifodalaydi? A) IV B) III C) I D) II 24 / 25 24. 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/√5=v₃/√10 B) aniqlab bo’lmaydi C) v₁=√5v₂=√10v₃ D) v₁=v₂=v₃ 25 / 25 25. Zaryadlangan shar sirtidan uning radiusiga teng masofaga uzoqlashilsa, elektr maydon potensiali qanday o’zgaradi? A) 2 marta kamayadi B) o’zgarmaydi C) 4 marta ortadi D) 2 marta ortadi 0% Testni qayta ishga tushiring Author: InfoMaster Fizika olimpiada
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