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8-sinf Fizika 4-chorak

InfoMaster

May 5, 2021

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8-sinf Fizika 4-chorak

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1 / 25

Suyuqlik oqimining tezligi bilan uning bosimi orasidagi miqdoriy bog'lanishni kim topdi?

A) Torichelli

B) Arximet

C) Bemueli

D) Paskal

2 / 25

Jism impulsi birligini ko'rsating

A) m/s^2

B) kg

C) kg*m/s

D) N*S

3 / 25

Qanday kuch jismni 0,5 masofaga ko'chirilganda 100 J ish bajaradi?

A) 20 N

B) 200 N

C) 100N

D) 50 N

4 / 25

Zaryadlangan jism atrofida nima hosil bo'ladi?

A) hech nima hosil bo'lmaydi

B) Elektr maydoni

C) hamma zaryadlar tortiladi

D) magnit maydoni

5 / 25

Yorug’lik tezligini birinchi bo’lib kim aniqlagan

A) J.Uatt

B) Nyuton

C) Rezirfort

D) O.Ryomer

6 / 25

Bitta atom massasini topish formulasini ko’rsating ?

A) N=mn∆z

B) ν=m/µ

C) to'g'ri javob yo'q

D) m=µ/N

7 / 25

Ionlar orasida Kulon kuchi tufayli vijudga keladigan kimyoviy bog’lanish……deb ataladi?

A) Ionli bog’lanish

B) Qutbli bog’lanish

C) Elektrolitlar

D) Kovalent bog’lanish

8 / 25

Necha volt kuchlanishli elektr tarmoq odam organizmi uchun xavflihisoblanadi?

A) 220 V dan yuqori

B) 36 V dan yuqori

C) 30 V dan yuqori

D) 300 Vdan yuqori

9 / 25

Elektr toki bajargan ishining asosiy birligi nima?

A) Vatt sekund

B) amper

C) Paskal

D) Volt

10 / 25

Elektr tokining bajargan ishini formulasini ko’rsating toping ?

A) J=q/t

B) Q=I^2RT

C) R=UI

D) A=UIT

11 / 25

Gaz orqali elektr toki o’tish jarayoni …..deyiladi ?

A) Uchqun

B) Gaz razryadi

C) Ion bog’lanish

D) Elektroliz

12 / 25

1,5 soat davom etgan elektrolizda katodda 15 mg nikel yig’iladi.Elektroliz vaqtida eletrolitdan o’tagan tok kuchini toping ?

A) 7 mA

B) 25 mA

C) 9mA

D) 35,5 mA

13 / 25

1Vatt.soat necha Jaulga teng ?

A) 5600 J

B) 3600 J

C) 360 J

D) 5000 J

14 / 25

O’lchami va shakli hisobga olinmaydigan zaryadlangan jism qanday nomlanadi ?

A) Musbat zaryad

B) Manfiy zaryad

C) Nuqtaviy zaryad

D) Elementar zaryad

15 / 25

Elektr sig’imining o’lchov birligi nima ?

A) amper

B) Farad

C) Sekund

D) Kulon

16 / 25

Akkumulator so’zining ma’nosi nima ?

A) To’plovchi

B) Tok manbayi

C) Zaryad oqimi

D) Zaryadlovchi

17 / 25

Qarshiliklari 200 Ω va 300 Ω bo`lgan ikkita elektr lampa parallel ulanib, 240 V tarmoqqa kiritilgan. Umumiy tok kattaligini toping.

A) 1.8 A

B) 2 A

C) 5 A

D) 4 A

18 / 25

Elektr zaryadining o’lchov birligi nima ?

A) Amper

B) volt

C) Joul

D) kulon

19 / 25

Zaryadi -5*10^-8 C bo’lgan nuqtaviy zaryadning 3 sm msofada hosil qilgan elektr maydon kuchlanganligini toping?

A) 5,1*10⁶ N/C

B) 5*10‾⁵ N/C

C) 5*10⁵ N/C

D) 6*10⁴ N/C

20 / 25

Atom so’zining ma’nosi nima ?

A) Elektr zaryat

B) Musbat zaryad

C) Bo’linmas

D) Zaryad

21 / 25

Elektr doimiysining son qiymati nechaga teng?

A) 3*10^-19 C

B) 8,85*10^-12C^2/N*m^2

C) -3*10^-19 C

D) 9,1*10^-31kg

22 / 25

Atom yadrosida ikkita proton va ikkita neytron bor. Undagi elektronlar soni nechta?

A) 4 ta

B) 2 ta

C) 6 ta

D) 0 ta

23 / 25

Temir moddasining (20⁰C da) solishtirma qashiligi nechaga teng?

$\rho =4*10^{-7}*\Omega *m$

A) 0,098

B) 0,4

C) 0.017

D) 0.5

24 / 25

Elektr zanjirida 2 m va ko’ndalang kesimining yuzi 0,5 mm² bo’lgan nixrom simning qarshiligini toping ?

A) 2,2 Ω

B) 4,4 Ω

C) 220 Ω

D) 440 Ω

25 / 25

Elektr zanjirlaridagi Lampochkadan 0,2 A tok o’moqda lampochka speraliorqali 1 minutda nechakulon zaryad o’tadi ?

A) 15 C

B) 12 C

C) 10 C

D) 24 C

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56%-70% 3 baho

55% va kamiga 2 baho

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