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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

Cho’ntak fanari lampochkasidagi kuchlanish 4,5 V, tok kuchi 0,2 A bo’lsa ,1minutdaqancha elektr energiya sarflanadi?

A) 50 J

B) 780 J

C) 60 J

D) 54 J

2 / 25

Elektrolizdan foydalanib ,buyumlarning sirtini qiyin oksidlanadigan metallar bilan qoplash….deyiladi ?

A) Galvonaplastina

B) Galvonastegiya

C) Ion bog’lanish

D) eletrlolez

3 / 25

Elektrolidan tok o’tayotganda elektrodlarda modda ajralib chiqish hodisasi……deb ataladi

A) Suvli eritma

B) Turli eritma

C) Eletroliz

D) Ion bog’lanish

4 / 25

Elektr toki bajargan ishining asosiy birligi nima?

A) Vatt sekund

B) amper

C) Paskal

D) Volt

5 / 25

manbaning turli qutb (faza) laridan kelayotgan ichki elektr simi ochiq joyining bir-biriga tegib ketishi…….deyiladi?

A) Tok kuchi

B) Zaryadlar

C) Elektr toki

D) qisqa tutashuv

6 / 25

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

A) Elektrolitlar

B) Kovalent bog’lanish

C) Ionli bog’lanish

D) Qutbli bog’lanish

7 / 25

220 V kuchlanishda 5 A tok olib ishlaydigan dazmolning quvvatini toping ?

A) 100 W

B) 1,1 kW

C) 110W

D) 220 W

8 / 25

Birinchi kosmik tezlik qanchaga teng?

A) 11,1 km/s

B) 8,4km/s

C) 11,2 km/s

D) 7,9 km/s

9 / 25

Atmosfera bosimi qanday asbob bilan o'lchanadi?

A) Barometr

B) laktometr

C) Monometr

D) Termometr

10 / 25

Yerning massasi qanchaga teng?

A) 2*10^30

B) 7,35*10^22

C) to'g'ri javob yo'q

D) 5,98*10^24

11 / 25

Zaryadlar qanday o'zaro ta'sirlashadi?

A) to'g'ri javob yo'q

B) hamma zaryadlar tortiladi va itarishadi

C) bir xil ishorali zaryadlar itarishadi, har xil ishoraki zaryadlar tortiladi

D) hamma zaryadlar tortiladi

12 / 25

Birinchi kosmik tezlik berilganda kosmik kema yer sirtida qanday harakatlanadi?

A) Aylana bo'ylab

B) hamma javob to'g'ri

C) Parobola bo'ylab

D) Ellips bo'ylab

13 / 25

Quyidagi formulalardan qaysi biri kuch momentini formulasi.

A) v=s/t

B) M=F/L

C) M=FL

D) F=mg

14 / 25

Elekt kuchlanishining ulchov birligi nima?

A) Amper

B) Kulon

C) Volt

D) Sekund

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) 2 A

B) 0,8 A

C) 4 A

D) 9 A

16 / 25

Rezistor so’zining manosi nima ?

A) Tok kuchi

B) Zaryad

C) Kuchlanish

D) Qarshilik

17 / 25

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

A) 15 C

B) 24 C

C) 12 C

D) 10 C

18 / 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

19 / 25

bu shartli belgi qanday nomlanadi?

A) Tok manbayi

B) Qo’ng’iroq

C) Kalit

D) O’tkazgichlarning tutashtirmasdan kesishishi

20 / 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) 1 Ω

B) 0.5 Ω

C) 0.4 Ω

D) 0.2 Ω

21 / 25

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

A) Nuqtaviy zaryad

B) Elementar zaryad

C) Musbat zaryad

D) Manfiy zaryad

22 / 25

Bitta elektron massasi nechaga teng ?

A) 9,1*10^-31kg

B) 8,81*10^-19kg

C) 3,36*10^-32kg

D) 1,6*10^-19kg

23 / 25

Elektr doimiysining son qiymati nechaga teng?

A) 3*10^-19 C

B) 9,1*10^-31kg

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

D) -3*10^-19 C

24 / 25

Bitta elektron zaryadi nechaga teng ?

A) 9,1*10^-31C

B) 1,6*10^-19C

C) 8,81*10^-19

D) 2,01*10^-19C

25 / 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) 6*10⁴ N/C

C) 5*10⁵ N/C

D) 5,1*10⁶ N/C

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