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8-sinf Fizika 2-chorak

InfoMaster

May 5, 2021

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8-sinf Fizika 2-chorak

Testni Shirinboyev Temurbek tayyorladi.

1 / 25

Elektr doimiysining son qiymati nechaga teng?

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

B) 9,1*10^-31kg

C) -3*10^-19 C

D) 3*10^-19 C

2 / 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) 4 A

C) 5 A

D) 2 A

3 / 25

Zaryadli zarralarning tartibli harakati,ya’ni oqiminima deb nomlanadi?

A) Elektr toki

B) Tok kuchi

C) Musbat zaryad

D) Zaryad

4 / 25

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

A) 6 ta

B) 0 ta

C) 2 ta

D) 4 ta

5 / 25

Atom tuzilishi modulini kim kashf etgan ?

A) Beruniy

B) Kulon

C) Rezerfort

D) Demokret

6 / 25

Elektr zaryadlarini to’plash uchun mo’ljallangan asbob qanday nomlanadi?

A) Areometr

B) Voltmetr

C) Ampermetr

D) kondensator

7 / 25

Bitta elektron zaryadi nechaga teng ?

A) 9,1*10^-31C

B) 8,81*10^-19

C) 2,01*10^-19C

D) 1,6*10^-19C

8 / 25

Bitta elektron massasi nechaga teng ?

A) 9,1*10^-31kg

B) 3,36*10^-32kg

C) 1,6*10^-19kg

D) 8,81*10^-19kg

9 / 25

Ikkita o`tkazgichlar avval ketma- ket, so`ngra parallel ulandi. Bunda uning umumiy qarsiligi qanday o`zgaradi?

A) o`zgarmaydi

B) 2 marta ortadi

C) 4 marta kamaydi

D) 2 marta kamayadi

10 / 25

Qarshiligi 10 Ω bo`lgan mis o`tkazgichni 5 ta teng bo`lakka bo`lib, bo`laklar o`zaro parallel ulandi. Umumiy qarshilikni toping.

A) 0.4 Ω

B) 0.5 Ω

C) 0.2 Ω

D) 1 Ω

11 / 25

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

A) 5*10‾⁵ N/C

B) 5,1*10⁶ N/C

C) 5*10⁵ N/C

D) 6*10⁴ N/C

12 / 25

Elektr zanjirida ketma-ket ulangan iste`molchilar qarshiliklari 80, 120 va 200 Om dan iborat. Umumiy kuchlanish 220 V bo`lsa, uchinchi iste`molchidagi kuchlanish tushuvini toping

A) 110 V

B) 180 V

C) 44 V

D) 220 V

13 / 25

Qahrabo so’zining ma’nosi nima ?

A) Qattiq rezina

B) Somon tortuvchi

C) Manfiy

D) Elektrlanuvchi

14 / 25

bu shartli belgi qanday nomlanadi?

A) O’tkazgichlarning tutashtirmasdan kesishishi

B) Kalit

C) Qo’ng’iroq

D) Tok manbayi

15 / 25

Uzunligi 1 m, ko’ndalang kesimining yuzi 0,4 mm² bo’lgan nikelin simning uchlaridagi kuchlanish 2 V gat eng. Shu elektr zanjir orqali o’tayotgan tok kuchini aniqlang?

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

A) 0,8 A

B) 4 A

C) 2 A

D) 9 A

16 / 25

Xonadonlardagi elect tarmog’ining kuchlanishi nechaga teng?

A) 5V

B) 220 V

C) 500 kV

D) 1,5 V

17 / 25

Elekt kuchlanishi formulasi berilgan javobni ko’rsating.

A) U=A|q

B) E=U/d

C) F=kq/r^2

D) I=q/t

18 / 25

Elektr zanjiridagi lampochkada parallel ulangan voltmeter 1,5 V ni ko’rsatmoqda. Lampochkadan 10 c zaryad o’tganda qancha ish bajariladi

A) 20 J

B) 15 J

C) 155 J

D) 220 J

19 / 25

Rezistor so’zining manosi nima ?

A) Qarshilik

B) Kuchlanish

C) Zaryad

D) Tok kuchi

20 / 25

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

A) 220 Ω

B) 440 Ω

C) 2,2 Ω

D) 4,4 Ω

21 / 25

Rezistor uchlaridagi kuchlanish 9 V ga teng . Unda 0,5 A tok utishi uchun uning qarshiligi qancha bo’lishi kerak ?

A) 20 Ω

B) 44 Ω

C) 18 Ω

D) 44.4 Ω

22 / 25

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

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

A) 0,4

B) 0.5

C) 0,098

D) 0.017

23 / 25

Elektr zanjirda tokni rostlash uchun qo’llaniladigan turli qarshilikli elektr asbobi qanday nomlanadi ?

A) elektrometr

B) potensiyometr

C) elektroskop

D) rezistor

24 / 25

Tok kuchini o’lchaydigan asbob qanday nomlanadi ?

A) Ampermetr

B) Elektroskop

C) Elektrometr

D) Voltmetr

25 / 25

Elektr janjiridagi lampochkadan ma’lum vaqt davomida 25 c zaryad o’tib , 75 J ish bajarildi,lampochka qanday elektr kuchlanish ostida yongan?

A) 3 v

B) 12 V

C) 25 V

D) 15 V

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71%-85% 4 baho

56%-70% 3 baho

55% va kamiga 2 baho

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8-sinf Fizika 2-chorak

Baholash mezoni

86%-100% 5 baho

71%-85% 4 baho

56%-70% 3 baho

55% va kamiga 2 baho

Author: InfoMaster

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