8- sinf uchun testlar

8- sinf uchun testlar
I variant
1.Zanjir sxemada qarshilik qanday bilinadi?
A) B) C) D)
2.Kulon qonuni firmulasini yozing.
A)K=F/l B)F=_{ } C)E=F/q D)F=E/q
3.Elementar zaryad miqdori nimaga teng?
A)9*10⁹c B)100 c C)1.6*10^-19c D)6.02*10²³c
4.Bir xil ishorali zaryadlar ….,qarama – qarshi ishorali zaryadlar…
A)tortiladi, tortiladi B)itariladi, tortiladi C)tortiladi,itariladi D)itariladi,itariladi
5.Zanjirning bir qismi uchun Om qonuni formulasini toping.
A)I=R/U B)U=R/I C)I=U/R
6.Bir – biridan 5 sm masofada sharchalardan biriga -4*10^-8 C ikinchisi esa 2*10^-8 C zaryad berilgan. Zaryadlar qanday kuch bilan tortiladi?
A)288 N B)2.88*10^-3N C) 2.88*10³N D)0.288 N
7.Nuqtaviy zaryadga maydon tomonidan ta`sir qiladigan kuchning shu zaryadga nisbati nimaga teng?
A)kuchlanishga B)tok kuchiga C)elektr maydon kuchlanganiga D)qarshilikka
8.Yer va bulut qanday zaryadlarga ega?
A)musbat va manfiy B)musbat va musbat C)manfiy va manfiy D)manfiy va musbat
9.Kondensator sig`imining o`lchov birligi?
A)Nyuton B)Farad C)Volt D)Kulon
10.Akumlator qanday vazifani bajaradi?
A)kimyoviy energiyani elektr energiyaga aylantiradi B)elektr energiyani kimyoviy energiyaga aylantiradi C)zaryed to`playdi D)tarmoqqa ulab turadi
11.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
12.Kuchlanishni toppish formulasini ko`rsating.
A)A=U*q B)E=F/q C)U=A/q D)I=q/t
13.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
14.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
15.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
16. 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
17.5 kg massali jism o`g`irliginimaga teng?
A)5 N B)40 N C)15 N D)49.5 N
18.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
19.Elektrofor mashinasi qanday vazifani bajaradi?
20.Elektr zanjir sxemasida reostat qanday belgilanadi?
21.Rezistor nima ?
22.Akkumlator 25 soat davomida 2 A tok berib tura oladi.Bunday akkumlator qancha zaryad to`play oladi?
23.Zaryadlarning bir tomonlama tartibli harakati…
24.Ampermetr zanjirga qanday ulanadi?
25.Voltmetr zanjirga qanday ulanadi?