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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

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) 155 J

C) 220 J

D) 15 J

2 / 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

3 / 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

4 / 25

Tok kuchi formulasi keltirilgan javobni aniqlang?

A) I=q/t

B) R=U/I

C) Q=ItU

D) U=A/q

5 / 25

Kuchlanishni o’lchaydigan asbob nima diyeladi?

A) voltmeter

B) elektrometr

C) elektroskop

D) ampermetr

6 / 25

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

A) Ion bog’lanish

B) Uchqun

C) Elektroliz

D) Gaz razryadi

7 / 25

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

A) 60 J

B) 54 J

C) 50 J

D) 780 J

8 / 25

Necha volt kuchlanishli elektr tarmoq odam organizmi uchun xavflihisoblanadi?

A) 36 V dan yuqori

B) 220 V dan yuqori

C) 30 V dan yuqori

D) 300 Vdan yuqori

9 / 25

Elektr tokining bajargan ishini formulasini ko’rsating toping ?

A) A=UIT

B) R=UI

C) Q=I^2RT

D) J=q/t

10 / 25

Elektr toki bajargan ishining asosiy birligi nima?

A) Vatt sekund

B) Volt

C) Paskal

D) amper

11 / 25

Bitta atom massasini topish formulasini ko’rsating ?

A) ν=m/µ

B) m=µ/N

C) to'g'ri javob yo'q

D) N=mn∆z

12 / 25

Atom so’zining ma’nosi nima ?

A) Elektr zaryat

B) Zaryad

C) Musbat zaryad

D) Bo’linmas

13 / 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

14 / 25

Bir-biridan 10sm masofada turgan sharchalardanbirining zaryadi -2*10^-8C, ikkinchisiniki esa 3*10^-8C ga teng. Ular qanday kuch bilan tortishadi?

A) 5,4*10‾⁴ N

B) 5*10‾⁸ N

C) 2*10‾⁸ N

D) 270 N

15 / 25

bu shartli belgi qanday nomlanadi?

A) Qo’ng’iroq

B) Kalit

C) Tok manbayi

D) O’tkazgichlarning tutashtirmasdan kesishishi

16 / 25

Jismlarning elektrlanganlikdarajasini aniqlovchisbob qanday nomlanadi ?

A) Elektroskop

B) Barometr

C) Dinomometr

D) Elektrometr

17 / 25

Elektrlanishning necha turi mavjud ?

A) 5

B) 4

C) 2

D) 3

18 / 25

Bitta elektron zaryadi nechaga teng ?

A) 2,01*10^-19C

B) 1,6*10^-19C

C) 9,1*10^-31C

D) 8,81*10^-19

19 / 25

Elektr zaryadining o’lchov birligi nima ?

A) Amper

B) Joul

C) kulon

D) volt

20 / 25

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

A) o`zgarmaydi

B) 2 marta kamayadi

C) 2 marta ortadi

D) 4 marta kamaydi

21 / 25

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

A) 0 ta

B) 6 ta

C) 2 ta

D) 4 ta

22 / 25

Birinchi kosmik tezlik qanchaga teng?

A) 8,4km/s

B) 7,9 km/s

C) 11,1 km/s

D) 11,2 km/s

23 / 25

Quyidagi formulalardan qaysi biri kuch momentini formulasi.

A) F=mg

B) M=F/L

C) M=FL

D) v=s/t

24 / 25

Kuch impulsini topish formulasini ko'rsating?

A) I=F*t

B) F=m*a

C) F=m*g

D) P=m*v

25 / 25

Atom qanday zaryadlardan tuzilgan?

A) to'g'ri javob yo'q

B) yadro,proton

C) yadrodan va manfiy zaryadlangan elektrondan

D) proton,neytron

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