8-sinf fizika O’zbekistonda nechta issiqlik va Gidroelektr stansiyalar bor?

8-sinf fizika

1. O’zbekistonda nechta issiqlik va Gidroelektr stansiyalar bor?

A)30 B)32 ta C)42 ta D) 60 E)70 ta

2. Rele so’zining ma’nosi?

A)Uzuvchi B)Almashtirib qo’shish C)qahrabo D)sakrabo E)elektr

3. Sxemada nima tasvirlangan?

A)rele B)saqlagich C)eruvchan saqlagich D)erimaydigan saqlagich E)TJY

4.Shishaning dielektrik singdiruvchanligi necha?

A)7 B)6 C)5

5.Gravitatsion doimiysini kim kashf etgan?

A)Nyuton B)Kavendish C)Kopernik D)Galiley E)Bor

6.Prujinaning potensial energiyasi formulasi?

A)Ep= mgh B)Ep = kx2/2 C)Ep= mv2/2 D) Ep= mv2/3 E) Ep= ms2/2

7. 1 kw/soat necha J?

A)3.6*106 B)3.6*106J C)1000 D)2000 E)1500

8.Oyda erkin tushish tezlanisi Yerdagidan necha marta kichik ?

A)6 B)7 C)5

9.Bir biridan qanday masofada 1 mk C va 10 n C zaryadlar 9 m N kuch bilan o’zaro ta’sirlashadi?

A)10 sm B)10mm C)10m D)0.1 sm E)0.01sm

10. 20 n C Li zaryad potensiali 700V bo’lgan nuqtadan potensiali 200V bo’lgan nuqtaga ko’chganda qancha ish bajaradi?

A)1 mk J B)10 mk J C)100 mk J D)1000 mk J E)0.1 mk J

11. Kondensator kuchlanishi 4 marta ortsa uning energiyasi necha marta ortadi?

A)2 B)4 C)16 D)24 E)64

12. 12 mV kuchlanish berilgan uzunligi 10 m ko’ndalang kesimi 2 mm2 bo’lgan po’lat simdagi tok kuchini toping? (mA)

A)10 B)20 C)30 D)40 E)1

13. Massasi 11t bo’lgan trolleybus 36 km/ h tezlik bilan harakatlanmoqda. Agar kuchlanish 550 V va FIK 80% bo’lsa dvigateldagi tok kuchini toping. Harakatga qarshilik koeffitsenti 0.02 (A)

A)50 B)500 C)0.5 D)5 E)10

14.Diotda electron anodga 8 Mm/ s tezlik bilan keladi. Anod kuchlanishini toping.

A)18 V B)180 V C)1.8 V D)0.18 V E)1800 V