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7-sinf Fizika 4-chorak

InfoMaster

Aprel 26, 2021

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7-sinf Fizika 4-chorak

Testni Vafaqulov Alisher tayyorladi.

1 / 25

Tezlanish formulasi qanday ifodalanadi

A) S = at² / 2

B) p = m / v

C) p = F / S

D) a = (v - v˳)/t

2 / 25

Samolyot qo’nish paytida g’ildiraklari yerga tekkandagi tezligi 360 km/soat. Agar uning tezlanishi 2m/s² bo’lsa, u qancha vaqtdan keyin to’xtaydi

A) 25 s

B) 100 s

C) 50 s

D) 5 s

3 / 25

Jism yerdan 35 m/s tezlik bilan tik yuqoriga otildi. U yerga necha sekunddan so’ng tushadi?

A) 9

B) 5

C) 7

D) 3

4 / 25

m/s² tezlanish bilan to’g’ri chiziq bo’ylab harakatlanayotgan jismning holatidan boshlab birinchi sekunda qanday masofani (m) o’tadi?

A) 8

B) 4

C) 6

D) 7

5 / 25

Jism tekis tezlanuvchan harakat boshlab, 3-sekundda 5 m yo’l o’tdi. U harakatning boshlang’ich 3 sekundida qanday yo’l o’tadi (m) ?

A) 11

B) 9

C) 7

D) 13

6 / 25

Joyidan qo’zg’algan jism 0,2 m/s² tezlanish bilan harakatlanganda 1 minutda u qanday tezlikka erishadi

A) 1,2 m/s

B) 12 m/s

C) 0,12 m/s

D) 120 m/s

7 / 25

Yuqoriga tik otilgan jism H balandlikkacha ko’tarildi. U 4H balandlikkacha ko’tarilishi uchun otish tezligini qanday o’zgartirishi kerak?

A) 1marta orttirish

B) 2marta orttirish

C) 4marta orttirish

D) 5marta kamaytirish

8 / 25

Avtomobil 5 m/s² tezlanish bilan tinch holatdan harakat boshladi. U 4s da necha metr yo’l o’tadi?

A) 30

B) 40

C) 10

D) 20

9 / 25

Jism 20 m/s tezlik bilan tik yuqoriga otildi. Jism necha sekund eng baland nuqtasigacha ko’tariladi? g = 10 m/s²

A) 3 c

B) 1 c

C) 2 c

D) 4 c

10 / 25

Oyning yer atrofida harakatlanish tezligini toping. Yer massasi 6*10 24 kg, yer bilan oy orasidagi masofa 400 000 km gravitatsion doimiylik $6,67\cdot 10^{-11}$ Nm²/kg²

A) 1 km/s

B) 7,9 km/s

C) 11,2 km/s

D) 9,8 km/s

11 / 25

Ikki jism bir biriga F kuchi bilan tortilmoqda. Agar birining massasi n marta kamaytirilsa ular qanday kuch bilan tortiladi

A) F(n+1)

B) F/n

C) F*n

D) F(n-1)

12 / 25

Yer sirtidagi h=2R balandlikda erkin tushish tezlanishi nimaga teng

A) g/9

B) g/4

C) g/2

D) g

13 / 25

Liftdagi odam o’ta yuklanishga duch kelishi mumkinmi?

A) Xa lift yuqoriga ko’tarilganda

B) Yo’q

C) Xa lift tezlanish bilan pastga tushganda

D) Xa agar lift tezlanish bilan yuqoriga ko’tarilsa

14 / 25

Oyda erkin tushish tezlanishi nimaga teng? (m/s²)

A) 1,6

B) 7,9

C) 9,8

D) 1

15 / 25

Yer sirtidagi jism yerga F kuch bilan tortilmoqda. Yer sirtidan h=2R balandlikka ko’tarilsa yerga qanday kuch bilan tortiladi? R-Ep radus

A) F/2

B) F/4

C) F/9

D) F/16

16 / 25

Jismning yerga tortilish kuchi …… deb ataladi

A) bosim kuchi

B) og’irlik kuchi

C) jism og’irligi

D) reaksiya kuchi

17 / 25

Yerning quyosh atrofida aylanish tezligi nimaga teng

A) 40 km/s

B) 10 km/s

C) 1 km/s

D) 30 km/s

18 / 25

Aylana bo’ylab tekis harakatda markazga intilma tezlanish formulasini ko’rsating.

1) a=v²/R, 2) a=v²/2R, 3) a=v/t

A) 1,2

B) 1

C) 2

D) 3

19 / 25

Aylanma tekis harakatga chiziqli tezlik va burchakli tezlik bog’lanish formulasini ko’rsating

A) υ=2pR/T

B) υ=ωR

C) ω=2p/T

D) ω=2p υ

20 / 25

Velosiped raridusi 25 m bo’lgan aylanma yo’lda 10 m/s tezlik bilan tekis harakatlanmoqda. Uning markazga intilma tezlanishini toping. (m/s²)

A) 5

B) 2

C) 4

D) 3

21 / 25

Soatning sekund mili burchakli tezligini toping. (rad/s)

A) π/1800

B) π/10

C) π/2600

D) π/30

22 / 25

Soatning minut mili aylanishining chastotasini toping.(Hz)

A) 100

B) 1/100

C) 1/7200

D) 1/3600

23 / 25

Markazga intilma tezlanish formulasi qaysi ifodada to'g'ri ko’rsatilgan?

A) a=v²/R

B) a=F/m

C) a=v/t

D) a=(v-v˳)/t

24 / 25

Soatning 30 mm uzunlikdagi minut mili uchi 10 minutda 31,4 mm uzunlikdagi yo’lni bosib o’tdi. Minut mili uchining chiziqli tezligini toping

A) 0,005 m/s

B) 0,5 m/s

C) 0,00005 m/s

D) 0,0005 m/s

25 / 25

Massasi 4 kg bo’lgan jism biror kuch ta’siri ostida 2 m/s² tezlanish oldi. Shunday kuch ta’siri ostida massasi 10 kg bo’lgan jism qanday tezlanish oladi?

A) 0,8 m/s²

B) 0

C) 2 m/s²

D) 1 m/s²