# 8- sinf uchun testlar

 bet 3/3 Sana 18.02.2023 Hajmi 88 Kb. #1209724
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8 sinf fizika fanidan bilimlar bella

8- sinf uchun testlar
III variant
1.Vagonning relsga nisbati 72 km/soat bo`lsa,uning diametric 40 sm bo`lgan g`ildiragining burchak tezligi necha rad/s ?
A)50 B)72 C)40 D)144
2. Avtamabil tekis tezlanuvchan harakat qilib tepalikga chiqmoqda uning o`rtacha tezligi 10m/s, oxirgi tezligi 2 m/s bo`lsa boshlang`ich tezligini toping?
A)18 B)20 C)15 D)10
3.5 kg massali jism o`g`irliginimaga teng?
A)5 N B)40 N C)15 N D)49.5 N
4.Elektr maydon kuchlanganligi 100 N/s bo`lgan maydonda zaryad miqdori 6 C bo`lgan shar kiritildi.unga maydon qandaykuch bilan tasir qiladi?
A)16.6 N B)166 N C)600 N D)60 N
A) B) C) D)
6.Kulon qonuni firmulasini yozing.
A)K=F/l B)F=  C)E=F/q D)F=E/q
A)9*109c B)100 c C)1.6*10-19c D)6.02*1023c
9.Zanjirning bir qismi uchun Om qonuni formulasini toping.
A)I=R/U B)U=R/I C)I=U/R
A)288 N B)2.88*10-3N C) 2.88*103N D)0.288 N
A)kuchlanishga B)tok kuchiga C)elektr maydon kuchlanganiga D)qarshilikka
12.Yer va bulut qanday zaryadlarga ega?
A)musbat va manfiy B)musbat va musbat C)manfiy va manfiy D)manfiy va musbat
13.Kondensator sig`imining o`lchov birligi?
15.Ko`chma magnitafon 9 v kuchlanishli tok manbaiga ega ma`lum vaqt davomida 450 J ish bajarsa undan qancha elektr zaryad o`tishi kerak?
A)4050 B)50 C)450 D)459
16.Kuchlanishni toppish formulasini ko`rsating.
A)A=U*q B)E=F/q C)U=A/q D)I=q/t
17.Lampochkadan ma`lum vaqt davomida 25 C zaryad o`tib 75 J bajargan.Lampochka qanday kuchlanish ostida yongan?(V)
A)100 B)50 C)25 D)3
18.Agar Lampochkadan 5 minutda 30 C zaryad o`tgani ma`lum bo`lsa,undagi tok kuchi qancha ?
A)150 A B)1.5 A C)0.2 A D)0.1 A
20.Elektr zanjir sxemasida reostat qanday belgilanadi?
21.Rezistor nima ?
1 variant
 S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 J C B C B C B C C B A B C D D A A D C

20.
21. Qarshilik
22. 180 000
23. elektr toki
24. ketma ket
25. parallel
2 variant
 S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 J B C A B C B C C B B B B C D A A A B

19. harakatga qarshi yo’nalgan kuchga
20. S=v0t+at2/2
21. kimyoviy energiyani elektr energiyaga aylantiradi
22. jismga tashqaridan tasir bo’lmasa, jism o’z vaziyatini o’zgartirmaydi
23. 88 V
24. 800 s
25. 180 000