Saytdagi oxirgi ma'lumot yangilangan sana: 16-декабрь 2024, 14:43
 Bosh sahifa  Mobile versiya

8-sinflarga 1-chorak uchun Fizika fanidan nazorat ishi testlari

1. Bir-biridan 2 metr masofada joylashgan sharchalarning biriga 4 ⋅ 10-4 C, ikkinchisig esa 2 ⋅ 10-4 C zaryad berilgan. Zaryadlar qanday kuch bilan tortishishadi? 
A) 160                       
B) 170                        
C) 180                               
D) 190                                                                                                                                               
2. Elektr zanjirdagi lampochkadan ma’lum vaqt davomida 25 C zaryad o‘tib, 75 J ish bajarildi. Lampochka qanday elektr kuchlanish ostida yongan?             
A) 1 Volt                       
B) 3 Volt                          
C) 5 Volt                           
D) 7 Volt                                                                                          
3. Ko‘chma magnitofon 9 V kuchlanishli tok manbayiga ega. Ma’lum vaqt davomida 450 J ish bajarish uchun magnitofondan qancha elektr zaryadi o‘tishi kerak?                                                          
A) 50                           
B) 60                           
C) 70                                   
D) 80                                                                                            
4. Elektr zanjirdagi lampochkadan 5 sekundda 30 C zaryad o‘tgani ma’lum. Zanjirdagi ampermetr lampochkadan qancha tok o‘tayotganini ko‘rsatadi?             
A) 5     
B) 6                        
C) 7                            
D) 8                                                                                                                                          
5. Akkumulyator 25 sekund davomida 2 A tok berib tura oladi. Bunday akkumulyator qancha elektr zaryadi to‘play oladi?      
A) 20 C          
B) 30 C                 
C) 40 C                     
D) 50 C                                                  
6. Elektr zanjirdagi iste’molchiga 2 V kuchlanish berilganda, undagi tok kuchi 0,1 A ga teng bo‘ladi. Elektr qarshiligi toping?
A) 10                      
B) 20                                  
C) 30                                   
D) 40                                                                                                                                                  
7. Cho‘ntak fonari lampochkasi 4,5 V kuchlanish ostida 0,3 A tok olib yonadi. Shu lampochka spiralining qarshiligi qancha?  
A) 15                     
B) 20                           
C) 25                              
D) 30                                                                                                                                      
8. Qarshiligi 110 Ω bo‘lgan o‘tkazgich orqali 2 A tok o‘tkazish uchun o‘tkazgich uchlariga qanday kuchlanish qo‘yish kerak?                   
A) 200 Volt        
B) 210 Volt                       
C) 220 Volt                 
D) 230 Volt                                                                                                     
9. Elektr zanjirga ulangan rezistorning qarshiligi  60 Ω. Rezistor uchlari orasidagi kuchlanish 12 V bo‘lsa, undan qancha tok o‘tadi?
A) 0.1        
B) 0.2         
C) 0.3                                
D) 0.4                                                                                                                       
10. Ketma-ket ulangan iste’molchilar qarshiligi 4 Ω, 10 Ω va 16 Ω bo‘lsa elektr zanjirini to’liq qarshiligini hisoblang?     
A) 5                
B) 10                         
C) 30                               
D) 20                      
11. Agar lampochkaga n ta kuchlanish ketma-ket ulanganda zanjirdagi to‘liq kuchlanishi fodasini yozing?                                  
12. Agar lampochkaga n ta qarshilik ketma-ket ulanganda zanjirdagi to‘liq qarshilik ifodasini yozing?                                        
13. Qarshiliklari 3 Ω va 6 Ω bo‘lgan ikkita iste’molchi parallel ulangan. Iste’molchilar ulangan zanjir qismining to‘liq qarshiligini toping?             
14. Agar elektr zanjiriga n ta lampochka bir-biriga parallel ulansa zanjirdagi to‘liq tok kuchi ifodasini yozing?                              
15. Agar elektr zanjiriga n ta lampochka bir-biriga parallel ulansa zanjirdagi tok kuchi ifodasini yozing?